Description. Table 1. Order codes. Part number Temperature range Package Packing Marking. A21SP16-40 C to +85 C Lead-free flip-chip Tape & reel 62

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1 A2SP6 3 W filter-free class-d audio power amplifier Datasheet - production data Pin connection IN + /A V DD 2/A2 3/A3 V DD 4/B 5/B2 6/B3 IN - STBY OUT - OUT + 7/C 8/C2 9/C3 IN+: positive differential input IN-: negative differential input VDD: analog power supply : power supply ground STBY: standby pin (active low) OUT+: positive differential output OUT-: negative differential output Output power:.4 5 V or.45 3 V into 8 with % THD+N max Adjustable gain via external resistors Low current consumption 2 3 V Efficiency: 88% typ. Signal to noise ratio: 85 db typ. PSRR: 63 db 27 Hz with 6 db gain PWM base frequency: 25 khz Low pop & click noise Thermal shutdown protection Available in flip-chip 9 x 3 m (Pb-free) Features C2 Stdby 3k Block diagram 5k 5k Internal Bias Oscillator PWM Operating from V CC = 2.4 V to 5.5 V Standby mode active low B B2 Vcc Output H Bridge Out+ C3 C - In- In+ + A Out- A2 B3 Output power: 3 W into 4 and.75 W into 8 with % THD+N max and 5 V power supply Output power: V or.75 3 V into 4 with % THD+N max A3 Applications Wearable Fitness and healthcare Cellular phone PDA Description The A2SP6 is a differential class-d BTL power amplifier. It is able to drive up to 2.3 W into a 4 load and.4 W into a 8 load at 5 V. It achieves outstanding efficiency (88% typ.) compared to classical Class-AB audio amps. The gain of the device can be controlled via two external gain-setting resistors. Pop & click reduction circuitry provides low on/off switch noise while allowing the device to start within 5 ms. A standby function (active low) allows the reduction of current consumption to na typ. Table. Order codes Part number Temperature range Package Packing Marking A2SP6-4 C to +85 C Lead-free flip-chip Tape & reel 62 March 24 DocID2637 Rev /37 This is information on a product in full production.

2 Contents A2SP6 Contents Absolute maximum ratings Application component information Electrical characteristics Electrical characteristic curves Application information Differential configuration principle Gain in typical application schematic Common mode feedback loop limitations For example: Low frequency response Decoupling of the circuit Wake-up time (t WU ) Shutdown time (t STBY ) Consumption in shutdown mode Single-ended input configuration Output filter considerations Different examples with summed inputs Example : Dual differential inputs Example 2: One differential input plus one single-ended input Footprint recommendations Package information Revision history /37 DocID2637 Rev

3 A2SP6 Absolute maximum ratings Absolute maximum ratings Table 2. Absolute maximum ratings Symbol Parameter Value Unit V CC Supply voltage (), (2) 6 V V in Input voltage (3) to V CC V T oper Operating free-air temperature range -4 to + 85 C T stg Storage temperature -65 to +5 C T j Maximum junction temperature 5 C R thja Thermal resistance junction to ambient (4) 2 C/W P diss Power dissipation Internally limited (5) ESD Human body model 2 kv ESD Machine model 2 V Latch-up Latch-up immunity 2 ma V STBY Standby pin voltage maximum voltage (6) to V CC V Lead temperature (soldering, sec) 26 C. Caution: This device is not protected in the event of abnormal operating conditions, such as for example, short-circuiting between any one output pin and ground, between any one output pin and V CC, and between individual output pins. 2. All voltage values are measured with respect to the ground pin. 3. The magnitude of the input signal must never exceed V CC +.3V / -.3V. 4. The device is protected in case of over temperature by a thermal shutdown 5 C. 5. Exceeding the power derating curves during a long period causes abnormal operation. 6. The magnitude of the standby signal must never exceed V CC +.3V / -.3V. Table 3. Operating conditions Symbol Parameter Value Unit V CC Supply voltage () V IC Common mode input voltage range (2) 2.4 to 5.5 V.5 to V CC -.8 V V STBY Standby voltage input: (3) Device ON Device OFF.4 V STBY V CC V STBY.4 (4) V R L Load resistor 4 R thja Thermal resistance junction to ambient (5) 9 C/W. For V CC from 2.4V to 2.5V, the operating temperature range is reduced to C T amb 7 C. 2. For V CC from 2.4V to 2.5V, the common mode input range must be set at V CC /2. 3. Without any signal on V STBY, the device will be in standby. 4. Minimum current consumption is obtained when V STBY =. 5. With heat sink surface = 25mm 2. DocID2637 Rev 3/37 37

4 Application component information A2SP6 2 Application component information Table 4. Component information Component C s Input capacitor Functional description Bypass supply capacitor. Install as close as possible to the A2SP6 to minimize high-frequency ripple. A nf ceramic capacitor should be added to enhance the power supply filtering at high frequency. Input resistor to program the A2SP6 differential gain (gain = 3 k/ with in k). Due to common mode feedback, these input capacitors are optional. However, they can be added to form with a st order high pass filter with -3dB cut-off frequency = /(2** *C in ). Figure. Typical application schematics Vcc In+ Differential Input Out- In- + Vcc Rin - Rin Input capacitors are optional C2 C A Stdby 3k 5k 5k Internal Bias Oscillator PWM B B2 Vcc Output H Bridge Out+ C3 - In- In+ + A3 TS4962 A2 B3 Cs u SPEAKER Vcc In+ Differential Input + Vcc Rin - Rin Input capacitors are optional C2 C A Stdby 3k 5k 5k Internal Bias Oscillator PWM B B2 Vcc Output H Bridge Out+ C3 In- - In- In+ + Out- A3 TS4962 A2 B3 Cs u 4 Ohms LC Output Filter 5µH 2µF 2µF 5µH 3µH Load µf µf 3µH 8 Ohms LC Output Filter 4/37 DocID2637 Rev

5 A2SP6 Electrical characteristics 3 Electrical characteristics Table 5. V CC = +5V, = V, V IC = 2.5V, t amb = 25 C (unless otherwise specified) Symbol Parameter Conditions Min. Typ. Max. Unit I CC Supply current No input signal, no load ma I STBY Standby current () No input signal, V STBY = na V OO Output offset voltage No input signal, R L = mv P out Output power THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =8 THD = % max, F = khz, R L = W THD + N Total harmonic distortion + noise Efficiency Efficiency PSRR CMRR Power supply rejection ratio with inputs grounded (2) Common mode rejection ratio P out =9mW RMS, G = 6dB, 2Hz < F < 2kHz R L = 8W + 5µH, BW < 3kHz P out =W RMS, G = 6dB, F = khz, R L = 8W + 5µH, BW < 3kHz P out =2W RMS, R L =4 + 5µH P out =.2W RMS, R L =8+ 5µH F = 27Hz, R L =8 V ripple = 2mV pp 63 db F = 27Hz, R L =8G = 6dB, V icm =2mV pp 57 db % % Gain Gain value in k V/V R STBY Internal resistance from Standby to 273k k k k Pulse width modulator F PWM khz base frequency SNR Signal to noise ratio A-weighting, P out =.2W, R L =8 85 db t WU Wake-up time 5 ms t STBY Standby time 5 ms DocID2637 Rev 5/37 37

6 Electrical characteristics A2SP6 Table 5. V CC = +5V, = V, V IC = 2.5V, t amb = 25 C (unless otherwise specified) (continued) Symbol Parameter Conditions Min. Typ. Max. Unit F = 2Hz to 2kHz, G = 6dB Unweighted R L =4 A-weighted R L = Unweighted R L =8 A-weighted R L = Unweighted R L =4 + 5µH A-weighted R L =4 + 5µH 83 6 V N Output voltage noise Unweighted R L =4 + 3µH A-weighted R L =4 + 3µH V RMS Unweighted R L =8 + 3µH A-weighted R L =8 + 3µH Unweighted R L =4 + Filter A-weighted R L =4 + Filter Unweighted R L =4 + Filter A-weighted R L =4 + Filter Standby mode is active when V STBY is tied to. 2. Dynamic measurements - 2*log(rms(V out )/rms(v ripple )). V ripple is the superimposed sinusoidal signal to V F = 27Hz. 6/37 DocID2637 Rev

7 A2SP6 Electrical characteristics Table 6. V CC = +4.2V, = V, V IC =2.5V, T amb = 25 C (unless otherwise specified) () Symbol Parameter Conditions Min. Typ. Max. Unit I CC Supply current No input signal, no load 2. 3 ma I STBY Standby current (2) No input signal, V STBY = na V OO Output offset voltage No input signal, R L = mv P out THD + N Output power Total harmonic distortion + noise Efficiency Efficiency PSRR CMRR Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =8 THD = % max, F = khz, R L =8 P out =6mW RMS, G = 6dB, 2Hz < F < 2kHz R L =8 + 5µH, BW < 3kHz P out =7mW RMS, G = 6dB, F = khz, R L =8 + 5µH, BW < 3kHz P out =.45W RMS, R L =4 + 5µH P out =.9W RMS, R L =8+ 5µH F = 27Hz, R L =8 V ripple =2mV pp 63 db F = 27Hz, R L =8G =6dB, V icm = 2mV pp 57 db W % % Gain Gain value in k V/V R STBY Internal resistance from Standby to 273k k k k Pulse width modulator F PWM khz base frequency SNR Signal to noise ratio A-weighting, P out =.9W, R L =8 85 db t WU Wake-uptime 5 ms t STBY Standby time 5 ms DocID2637 Rev 7/37 37

8 Electrical characteristics A2SP6 Table 6. V CC = +4.2V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) () (continued) Symbol Parameter Conditions Min. Typ. Max. Unit F = 2Hz to 2kHz, G = 6dB Unweighted R L =4 A-weighted R L = Unweighted R L =8 A-weighted R L = Unweighted R L =4 + 5µH A-weighted R L =4 + 5µH 83 6 V N Output voltage noise Unweighted R L =4 + 3µH A-weighted R L =4 + 3µH V RMS Unweighted R L =8 + 3µH A-weighted R L =8 + 3µH Unweighted R L =4 + Filter A-weighted R L =4 + Filter Unweighted R L =4 + Filter A-weighted R L =4 + Filter All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V. 2. Standby mode is active when V STBY is tied to. 3. Dynamic measurements - 2*log(rms(V out )/rms(v ripple )). V ripple is the superimposed sinusoidal signal to V F = 27Hz. 8/37 DocID2637 Rev

9 A2SP6 Electrical characteristics Table 7. V CC = +3.6V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) () Symbol Parameter Conditions Min. Typ. Max. Unit I CC Supply current No input signal, no load ma I STBY Standby current (2) No input signal, V STBY = na V OO Output offset voltage No input signal, R L = mv P out Output power THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =8 THD = % max, F = khz, R L = W THD + N Total harmonic distortion + noise Efficiency Efficiency PSRR CMRR Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio P out =5mW RMS, G = 6dB, 2Hz < F< 2kHz R L =8 + 5µH, BW < 3kHz P out =5mW RMS, G = 6dB, F = khz, R L =8 + 5µH, BW < 3kHz P out =W RMS, R L =45µH P out =.65W RMS, R L =85µH.27 F = 27Hz, R L =8 V ripple = 2mV pp 62 db F = 27Hz, R L =8G = 6dB, V icm =2mV pp 56 db % % Gain Gain value in k V/V R STBY Internal resistance from Standby to 273k k k k Pulse width modulator F PWM khz base frequency SNR Signal to noise ratio A-weighting, P out =.6W, R L =8 83 db t WU Wake-uptime 5 ms t STBY Standby time 5 ms DocID2637 Rev 9/37 37

10 Electrical characteristics A2SP6 Table 7. V CC = +3.6V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) () (continued) Symbol Parameter Conditions Min. Typ. Max. Unit F = 2Hz to 2kHz, G = 6dB Unweighted R L =4 A-weighted R L = Unweighted R L =8 A-weighted R L = Unweighted R L =4 + 5µH A-weighted R L =4+ 5µH 8 58 V N Output voltage noise Unweighted R L =4+ 3µH A-weighted R L =4 + 3µH V RMS Unweighted R L =8 + 3µH A-weighted R L =8+ 3µH Unweighted R L =4 + Filter A-weighted R L =4 + Filter Unweighted R L =4 + Filter A-weighted R L =4 + Filter All electrical values are guaranteed with correlation measurements at 2.5V and 5V. 2. Standby mode is active when V STBY is tied to. 3. Dynamic measurements - 2*log(rms(V out )/rms(v ripple )). V ripple is the superimposed sinusoidal signal to V F = 27Hz. /37 DocID2637 Rev

11 A2SP6 Electrical characteristics Table 8. V CC = +3V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) () Symbol Parameter Conditions Min. Typ. Max. Unit I CC Supply current No input signal, no load ma I STBY Standby current (2) No input signal, V STBY = na V OO Output offset voltage No input signal, R L = mv P out Output power THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =8 THD = % max, F = khz, R L = W THD + N Total harmonic distortion + noise Efficiency Efficiency PSRR CMRR Power supply rejection ratio with inputs grounded (3) Common mode rejection ratio P out = 35mW RMS, G = 6dB, 2Hz < F < 2kHz R L =8 + 5µH, BW < 3kHz P out = 35mW RMS, G = 6dB, F = khz, R L =8 + 5µH, BW < 3kHz P out =.7W RMS, R L =4 + 5µH P out =.45W RMS, R L =8+ 5µH.2 F = 27Hz, R L =8 V ripple = 2mV pp 6 db F = 27Hz, R L =8G =6dB, V icm = 2mV pp 54 db % % Gain Gain value in k V/V R STBY Internal resistance from Standby to 273k k k k Pulse width modulator F PWM khz base frequency SNR Signal to noise ratio A-weighting, P out =.4W, R L =8 82 db t WU Wake-up time 5 ms t STBY Standby time 5 ms DocID2637 Rev /37 37

12 Electrical characteristics A2SP6 Table 8. V CC = +3V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) () (continued) Symbol Parameter Conditions Min. Typ. Max. Unit f = 2Hz to 2kHz, G = 6dB Unweighted R L =4 A-weighted R L = Unweighted R L =8 A-weighted R L = Unweighted R L =4 + 5µH A-weighted R L =4 + 5µH 8 58 V N Output voltage noise Unweighted R L =4 + 3µH A-weighted R L =4 + 3µH V RMS Unweighted R L =8 + 3µH A-weighted R L =8 + 3µH Unweighted R L =4 + Filter A-weighted R L =4 + Filter Unweighted R L =4 + Filter A-weighted R L =4 + Filter All electrical values are guaranteed with correlation measurements at 2.5 V and 5 V. 2. Standby mode is active when V STBY is tied to. 3. Dynamic measurements - 2*log(rms(V out )/rms(v ripple )). V ripple is the superimposed sinusoidal signal to V F = 27Hz. 2/37 DocID2637 Rev

13 A2SP6 Electrical characteristics Table 9. V CC = +2.5V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) Symbol Parameter Conditions Min. Typ. Max. Unit I CC Supply current No input signal, no load ma I STBY Standby current () No input signal, V STBY = na V OO Output offset voltage No input signal, R L = mv P out THD + N Output power Total harmonic distortion + noise Efficiency Efficiency PSRR CMRR Power supply rejection ratio with inputs grounded (2) Common mode rejection ratio THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =8 THD = % max, F = khz, R L =8 P out =2mW RMS, G = 6dB, 2Hz < F< 2kHz R L =8 + 5µH, BW < 3kHz P out = 2W RMS, G = 6dB, F = khz, R L =8 + 5µH, BW < 3kHz P out =.47W RMS, R L =4 + 5µH P out =.3W RMS, R L =8+ 5µH F = 27Hz, R L =8 V ripple = 2mV pp 6 db F = 27Hz, R L =8G = 6dB, V icm =2mV pp 54 db W % % Gain Gain value in k V/V R STBY Internal resistance from Standby to 273k k k k Pulse width modulator F PWM khz base frequency SNR Signal to noise ratio A-weighting, P out =.2W, R L =8 8 db t WU Wake-up time 5 ms t STBY Standby time 5 ms DocID2637 Rev 3/37 37

14 Electrical characteristics A2SP6 Table 9. V CC = +2.5V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) (continued) Symbol Parameter Conditions Min. Typ. Max. Unit F = 2Hz to 2kHz, G = 6dB Unweighted R L =4 A-weighted R L = Unweighted R L =8 A-weighted R L = Unweighted R L =4 + 5µH A-weighted R L =4 + 5µH V N Output voltage noise Unweighted R L =4 + 3µH A-weighted R L =4 + 3µH 82 6 V RMS Unweighted R L =8 + 3µH A-weighted R L =8 + 3µH Unweighted R L =4 + Filter A-weighted R L =4 + Filter Unweighted R L =4 + Filter A-weighted R L =4 + Filter Standby mode is active when V STBY is tied to. 2. Dynamic measurements - 2*log(rms(V out )/rms(v ripple )). V ripple is the superimposed sinusoidal signal to V F = 27Hz. 4/37 DocID2637 Rev

15 A2SP6 Electrical characteristics Table. V CC = +2.4V, = V, V IC = 2.5V, T amb = 25 C (unless otherwise specified) Symbol Parameter Conditions Min. Typ. Max. Unit I CC Supply current No input signal, no load.7 ma I STBY Standby current () No input signal, V STBY = na V OO Output offset voltage No input signal, R L =8 3 mv P out Output power THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =4 THD = % max, F = khz, R L =8 THD = % max, F = khz, R L = W THD + N Total harmonic distortion + noise P out =2mW RMS, G = 6dB, 2Hz < F< 2kHz R L =8 + 5µH, BW < 3kHz % Efficiency Efficiency CMRR Common mode rejection ratio P out =.38W RMS, R L =4 + 5µH P out =.25W RMS, R L =8+ 5µH F = 27Hz, R L =8, G = 6dB, DV icm = 2mV pp 54 db % Gain Gain value in k V/V R STBY Internal resistance from Standby to k F PWM Pulse width modulator base frequency 25 khz SNR Signal to noise ratio A Weighting, P out =.2W, R L =8 8 db t WU Wake-up time 5 ms t STBY Standby time 5 ms V N Output voltage noise F = 2Hz to 2kHz, G = 6dB Unweighted R L =4 A-weighted R L =4 Unweighted R L =8 A-weighted R L =8. Standby mode is active when V STBY is tied to. Unweighted R L =4+ 5µH A-weighted R L =4+ 5µH Unweighted R L =4+ 3µH A-weighted R L =4+ 3µH Unweighted R L =8+ 3µH A-weighted R L =8 + 3µH Unweighted R L =4+ Filter A-weighted R L =4+ Filter Unweighted R L =4+ Filter A-weighted R L =4+ Filter 273k k k V RMS DocID2637 Rev 5/37 37

16 Electrical characteristic curves A2SP6 4 Electrical characteristic curves The graphs included in this section use the following abbreviations: R L + 5 H or 3 H = pure resistor + very low series resistance inductor Filter = LC output filter ( µf + 3 µh for 4 and.5 µf + 6 µh for 8 ) All measurements done with C s = µf and C s2 = nf except for PSRR where Cs is removed. Figure 2. Test diagram for measurements uf Vcc nf Cs + Cs2 Cin Cin Rin 5k Rin 5k Out+ In+ TS4962 In- Out- 5uH or 3uH or LC Filter 4 or 8 Ohms RL 5th order 5kHz low pass filter Audio Measurement Bandwidth < 3kHz Figure 3. Test diagram for PSRR measurements nf Cs2 2Hz to 2kHz Vcc 4.7uF 4.7uF Rin 5k Rin 5k Out+ In+ TS4962 In- Out- 5uH or 3uH or LC Filter 4 or 8 Ohms RL 5th order 5kHz low pass filter 5th order 5kHz low pass filter Reference RMS Selective Measurement Bandwidth=% of Fmeas 6/37 DocID2637 Rev

17 A2SP6 Electrical characteristic curves Figure 4. Current consumption vs. power supply voltage Figure 5. Current consumption vs. standby voltage Current Consumption (ma) 2.5 No load Tamb=25 C Power Supply Voltage (V) Current Consumption (ma) Vcc = 5V No load Tamb=25 C Standby Voltage (V) Figure 6. Current consumption vs. standby voltage Figure 7. Output offset voltage vs. common mode input voltage 2. 2 Current Consumption (ma).5..5 Vcc = 3V No load Tamb=25 C Standby Voltage (V) Voo (mv) 5 5 Vcc=2.5V Vcc=3.3V G = 6dB Common Mode Input Voltage (V) Figure 8. Efficiency vs. output power Figure 9. Efficiency vs. output power 6 2 Efficiency (%) 8 6 Efficiency Power Dissipation 2 RL=4Ω + 5μH F=kHz THD+N 2% Output Power (W) Power Dissipation (mw) Efficiency (%) Efficiency Power Dissipation Vcc=3V 5 2 RL=4Ω + 5μH F=kHz THD+N 2% Output Power (W) 5 Power Dissipation (mw) DocID2637 Rev 7/37 37

18 Electrical characteristic curves A2SP6 Figure. Efficiency vs. output power Figure. Efficiency vs. output power 5 75 Efficiency (%) Efficiency Power Dissipation 2 RL=8Ω + 5μH F=kHz THD+N % Output Power (W) 5 Power Dissipation (mw) Efficiency (%) 8 6 Efficiency 4 Power 25 Dissipation Vcc=3V 2 RL=8Ω + 5μH F=kHz THD+N % Output Power (W) 5 Power Dissipation (mw) Figure 2. Output power vs. power supply voltage Figure 3. Output power vs. power supply voltage Output power (W) RL = 4Ω + 5μH F = khz BW < 3kHz THD+N=% THD+N=2% Output power (W) RL = 8Ω + 5μH F = khz BW < 3kHz THD+N=% THD+N=% Vcc (V) Vcc (V) Figure 4. PSRR vs. frequency Figure 5. PSRR vs. frequency PSRR (db) Vripple = 2mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 4Ω + 5μH Vcc=3V PSRR (db) Vripple = 2mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 4Ω + 3μH Vcc=3V k k 8/37 DocID2637 Rev

19 A2SP6 Electrical characteristic curves Figure 6. PSRR vs. frequency Figure 7. PSRR vs. frequency PSRR (db) Vripple = 2mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 4Ω + Filter Vcc=3V PSRR (db) Vripple = 2mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 8Ω + 5μH Vcc=3V k k Figure 8. PSRR vs. frequency Figure 9. PSRR vs. frequency PSRR (db) Vripple = 2mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 8Ω + 3μH Vcc=3V PSRR (db) Vripple = 2mVpp Inputs = Grounded G = 6dB, Cin = 4.7μF RL = 8Ω + Filter Vcc=3V k k Figure 2. PSRR vs. common mode input voltage Figure 2. CMRR vs. frequency PSRR(dB) Vripple = 2mVpp F = 27Hz, G = 6dB RL 4Ω + 5μH Vcc=2.5V Vcc=3.3V CMRR (db) -2-4 RL=4Ω + 5μH ΔVicm=5mVpp Cin=4.7μF, 3V Common Mode Input Voltage (V) k DocID2637 Rev 9/37 37

20 Electrical characteristic curves A2SP6 Figure 22. CMRR vs. frequency Figure 23. CMRR vs. frequency CMRR (db) -2-4 RL=4Ω + 3μH ΔVicm=5mVpp Cin=4.7μF, 3V CMRR (db) -2-4 RL=4Ω + Filter ΔVicm=5mVpp Cin=4.7μF, 3V k 2 2k Figure 24. CMRR vs. frequency Figure 25. CMRR vs. frequency CMRR (db) -2-4 RL=8Ω + 5μH ΔVicm=5mVpp Cin=4.7μF, 3V CMRR (db) -2-4 RL=8Ω + 3μH ΔVicm=5mVpp Cin=4.7μF, 3V k 2 2k Figure 26. CMRR vs. frequency Figure 27. CMRR vs. common mode input voltage CMRR (db) -2-4 RL=8Ω + Filter ΔVicm=5mVpp Cin=4.7μF, 3V CMRR(dB) ΔVicm = 2mVpp F = 27Hz G = 6dB RL 4Ω + 5μH Vcc=2.5V Vcc=3.3V k Common Mode Input Voltage (V) 2/37 DocID2637 Rev

21 A2SP6 Electrical characteristic curves Figure 28. THD+N vs. output power Figure 29. THD+N vs. output power RL = 4Ω + 5μH F = khz G = 6dB BW < 3kHz Vcc=2.5V Vcc=4V RL = 4Ω + 3μH F = khz G = 6dB BW < 3kHz Vcc=2.5V Vcc=4V. E-3.. Output Power (W). E-3.. Output Power (W) Figure 3. THD+N vs. output power Figure 3. THD+N vs. output power RL = 8Ω + 5μH F = khz G = 6dB BW < 3kHz Vcc=2.5V Vcc=3.3V RL = 8Ω + Filter F = khz G = 6dB BW < 3kHz Vcc=3.3V Vcc=2.5V.. E-3.. Output Power (W) E-3.. Output Power (W) Figure 32. THD+N vs. output power Figure 33. THD+N vs. output power RL = 4Ω + 5μH F = khz G = 6dB BW < 3kHz Vcc=2.5V Vcc=4V RL = 4Ω + 3μH F = khz G = 6dB BW < 3kHz Vcc=2.5V Vcc=4V. E-3.. Output Power (W). E-3.. Output Power (W) DocID2637 Rev 2/37 37

22 Electrical characteristic curves A2SP6 Figure 34. THD+N vs. output power Figure 35. THD+N vs. output power RL = 8Ω + 5μH F = khz G = 6dB BW < 3kHz Vcc=2.5V Vcc=3.3V RL = 8Ω + Filter F = khz G = 6dB BW < 3kHz Vcc=2.5V Vcc=3.3V.. E-3.. Output Power (W) E-3.. Output Power (W) Figure 36. THD+N vs. frequency Figure 37. THD+N vs. frequency RL=8Ω + 5μH Bw < 3kHz Po=.9W RL=8Ω + Filter Bw < 3kHz Po=.9W. Po=.45W. Po=.45W 2 2k 2 2k Figure 38. THD+N vs. frequency Figure 39. THD+N vs. frequency RL=4Ω + 5μH Bw < 3kHz Vcc=3.6V Po=.7W RL=4Ω + 3μH Bw < 3kHz Vcc=3.6V Po=.7W. Po=.35W. Po=.35W 2 2k 2 2k 22/37 DocID2637 Rev

23 A2SP6 Electrical characteristic curves Figure 4. THD+N vs. frequency Figure 4. THD+N vs. frequency. RL=4Ω + 5μH Bw < 3kHz Vcc=2.5V Po=.3W Po=.W. RL=4Ω + Filter Bw < 3kHz Vcc=2.5V Po=.3W Po=.W. 2 2k. 2 2k Figure 42. THD+N vs. frequency Figure 43. THD+N vs. frequency. RL=8Ω + 5μH Bw < 3kHz 2 Po=.9W Po=.45W 2k Efficiency (%) Efficiency Power Dissipation 2 RL=8Ω + 5μH F=kHz THD+N % Output Power (W) 5 5 Power Dissipation (mw) Figure 44. THD+N vs. frequency Figure 45. THD+N vs. frequency. RL=8Ω + 5μH Bw < 3kHz Vcc=3.6V Po=.5W. RL=8Ω + 3μH Bw < 3kHz Vcc=3.6V Po=.5W Po=.25W Po=.25W. 2 2k. 2 2k DocID2637 Rev 23/37 37

24 Electrical characteristic curves A2SP6 Figure 46. THD+N vs. frequency Figure 47. THD+N vs. frequency. RL=8Ω + 5μH Bw < 3kHz Vcc=2.5V Po=.2W. RL=8Ω + Filter Bw < 3kHz Vcc=2.5V Po=.2W Po=.W Po=.W. 2 2k. 2 2k Figure 48. Gain vs. frequency Figure 49. Gain vs. frequency 8 8 Differential Gain (db) RL=4Ω + 5μH Vin=5mVpp Cin=μF, 3V 2k Differential Gain (db) RL=4Ω + 3μH Vin=5mVpp Cin=μF, 3V 2k Figure 5. Gain vs. frequency Figure 5. Gain vs. frequency 8 8 Differential Gain (db) RL=4Ω + Filter Vin=5mVpp Cin=μF, 3V 2k Differential Gain (db) RL=8Ω + 5μH Vin=5mVpp Cin=μF, 3V 2k 24/37 DocID2637 Rev

25 A2SP6 Electrical characteristic curves Figure 52. Gain vs. frequency Figure 53. Gain vs. frequency 8 8 Differential Gain (db) RL=8Ω + 3μH Vin=5mVpp Cin=μF, 3V 2k Differential Gain (db) RL=8Ω + Filter Vin=5mVpp Cin=μF, 3V 2k Figure 54. Gain vs. frequency Figure 55. Startup & shutdown time V CC =5 V, G=6 db, C in = µf (5 ms/div) 8 Vo Differential Gain (db) , 3V RL=No Load Vin=5mVpp Cin=μF 2k Vo2 Standby Vo-Vo2 Figure 56. Startup & shutdown time V CC =3V, G=6 db, C in = µf (5 ms/div) Figure 57. Startup & shutdown time V CC =5V, G=6 db, C in = nf (5 ms/div) Vo Vo Vo2 Vo2 Standby Standby Vo-Vo2 Vo-Vo2 DocID2637 Rev 25/37 37

26 Electrical characteristic curves A2SP6 Figure 58. Startup & shutdown time V CC =3 V, G=6 db, C in = nf (5 ms/div) Figure 59. Startup & shutdown time V CC = 5 V, G = 6 db, No C in (5 ms/div) Vo Vo Vo2 Vo2 Standby Standby Vo-Vo2 Vo-Vo2 Figure 6. Startup & shutdown time V CC =3 V, G=6 db, No C in (5 ms/div) Vo Vo2 Standby Vo-Vo2 26/37 DocID2637 Rev

27 A2SP6 Application information 5 Application information 5. Differential configuration principle The A2SP6 is a monolithic fully-differential input/output class D power amplifier. The A2SP6 also includes a common-mode feedback loop that controls the output bias value to average it at V CC /2 for any DC common mode input voltage. This allows the device to always have a maximum output voltage swing, and by consequence, maximizes the output power. Moreover, as the load is connected differentially compared to a single-ended topology, the output is four times higher for the same power supply voltage. The advantages of a full-differential amplifier are: High PSRR (power supply rejection ratio). High common mode noise rejection. Virtually zero pop without additional circuitry, giving a faster start-up time compared to conventional single-ended input amplifiers. Easier interfacing with differential output audio DAC. No input coupling capacitors required due to common mode feedback loop. The main disadvantage is: As the differential function is directly linked to external resistor mismatching, paying particular attention to this mismatching is mandatory in order to obtain the best performance from the amplifier. 5.2 Gain in typical application schematic Typical differential applications are shown in Figure on page 4. In the flat region of the frequency-response curve (no input coupling capacitor effect), the differential gain is expressed by the relation: Out + Out - A Vdiff = In + In - = with expressed in k Due to the tolerance of the internal 5 k feedback resistor, the differential gain will be in the range (no tolerance on ): A R Vdiff in DocID2637 Rev 27/37 37

28 Application information A2SP6 5.3 Common mode feedback loop limitations As explained previously, the common mode feedback loop allows the output DC bias voltage to be averaged at V CC /2 for any DC common mode bias input voltage. However, due to V icm limitation in the input stage (see Table 3: Operating conditions on page 3), the common mode feedback loop can ensure its role only within a defined range. This range depends upon the values of V CC and (A Vdiff ). To have a good estimation of the V icm value, we can apply this formula (no tolerance on ): with V CC + 2 V IC 5k V icm = k (V) In + + In - V IC = (V) 2 and the result of the calculation must be in the range:.5v V icm V CC.8V Due to the +/-9% tolerance on the 5k resistor, it s also important to check V icm in these conditions: V CC + 2 V IC 36.5k k V VCC Rin + 2 V IC 63.5k icm k For example: If the result of V icm calculation is not in the previous range, input coupling capacitors must be used (with V CC from 2.4 V to 2.5 V, input coupling capacitors are mandatory). With V CC =3 V, = 5 k and V IC = 2.5 V, we typically find V icm = 2 V and this is lower than 3V -.8 V = 2.2 V. With 36.5 k we find.97 V, and with 63.5 k we have 2.2 V. So, no input coupling capacitors are required. 5.4 Low frequency response If a low frequency bandwidth limitation is requested, it is possible to use input coupling capacitors. In the low frequency region, C in (input coupling capacitor) starts to have an effect. C in forms, with, a first order high-pass filter with a -3dB cut-off frequency: F CL = (Hz) 2 C in So, for a desired cut-off frequency we can calculate C in, with in and F CL in Hz. C in = (F) 2 F CL 28/37 DocID2637 Rev

29 A2SP6 Application information 5.5 Decoupling of the circuit A power supply capacitor, referred to as C S, is needed to correctly bypass the A2SP6. The A2SP6 has a typical switching frequency at 25 khz and output fall and rise time about 5 ns. Due to these very fast transients, careful decoupling is mandatory. A µf ceramic capacitor is enough, but it must be located very close to the A2SP6 in order to avoid any extra parasitic inductance created an overly long track wire. In relation with di/dt, this parasitic inductance introduces an overvoltage that decreases the global efficiency and, if it is too high, may cause a breakdown of the device. In addition, even if a ceramic capacitor has an adequate high frequency ESR value, its current capability is also important. A 63 size is a good compromise, particularly when a 4 load is used. Another important parameter is the rated voltage of the capacitor. A µf/6.3 V capacitor used at 5 V, loses about 5% of its value. In fact, with a 5 V power supply voltage, the decoupling value is about.5 µf instead of µf. As C S has particular influence on the THD+N in the medium-high frequency region, this capacitor variation becomes decisive. In addition, less decoupling means higher overshoots, which can be problematic if they reach the power supply AMR value (6 V). 5.6 Wake-up time (t WU ) When the standby is released to set the device ON, there is a wait of about 5 ms. The A2SP6 has an internal digital delay that mutes the outputs and releases them after this time in order to avoid any pop noise. 5.7 Shutdown time (t STBY ) When the standby command is set, the time required to put the two output stages into high impedance and to put the internal circuitry in shutdown mode, is about 5 ms. This time is used to decrease the gain and avoid any pop noise during shutdown. 5.8 Consumption in shutdown mode Between the shutdown pin and there is an internal 3 k resistor. This resistor forces the A2SP6 to be in standby mode when the standby input pin is left floating. However, this resistor also introduces additional power consumption if the shutdown pin voltage is not V. For example, with a.4 V standby voltage pin, Table 3: Operating conditions on page 3, shows that you must add.4 V/3 k =.3 µa in typical (.4 V/273 k =.46 µa in maximum) to the shutdown current specified in Table 5 on page Single-ended input configuration It is possible to use the A2SP6 in a single-ended input configuration. However, input coupling capacitors are needed in this configuration. The schematic in Figure 6 shows a single-ended input typical application. DocID2637 Rev 29/37 37

30 Application information A2SP6 Figure 6. Single-ended input typical application Vcc Ve Standby Cin Rin Rin Cin C2 C A Stdby 3k 5k 5k Internal Bias Oscillator PWM B B2 Vcc Output H Bridge Out+ C3 - In- In+ + Out- A3 TS4962 A2 B3 Cs u SPEAKER All formulas are identical except for the gain (with in k: A V single V e = Out + Out - = And, due to the internal resistor tolerance we have: A R V gle in sin In the event that multiple single-ended inputs are summed, it is important that the impedance on both A2SP6 inputs (In - and In + ) are equal. Figure 62. Typical application schematic with multiple single-ended inputs Vek Cink Ve Cin Ceq Standby Rink Rin Req C2 C A Stdby 3k 5k 5k Internal Bias Oscillator PWM B B2 Vcc Output H Bridge Vcc Out+ C3 - In- In+ + Out- A3 TS4962 A2 B3 Cs u SPEAKER 3/37 DocID2637 Rev

31 A2SP6 Application information We have the following equations: Out + Out = V e + + V R ek (V) in k C eq = k j C inj = C = (F) inj 2 R F inj CLj R eq = k j In general, for mixed situations (single-ended and differential inputs), it is best to use the same rule, that is, to equalize impedance on both A2SP6 inputs. j = 5. Output filter considerations The A2SP6 is designed to operate without an output filter. However, due to very sharp transients on the A2SP6 output, EMI radiated emissions may cause some standard compliance issues. These EMI standard compliance issues can appear if the distance between the A2SP6 outputs and loudspeaker terminal is long (typically more than 5 mm, or mm in both directions, to the speaker terminals). As the PCB layout and internal equipment device are different for each configuration, it is difficult to provide a one-size-fits-all solution. However, to decrease the probability of EMI issues, there are several simple rules to follow: Reduce, as much as possible, the distance between the A2SP6 output pins and the speaker terminals. Use ground planes for shielding sensitive wires. Place, as close as possible to the A2SP6 and in series with each output, a ferrite bead with a rated current at minimum 2 A and impedance greater than 5 at frequencies above 3 MHz. If, after testing, these ferrite beads are not necessary, replace them by a short-circuit. Murata BLM8EG22SN or BLM8EG2SN are possible examples of devices you can use. Allow enough footprint to place, if necessary, a capacitor to short perturbations to ground (see the schematics in Figure 63). Figure 63. Method for shorting pertubations to ground From TS4962 output Ferrite chip bead To speaker about pf Gnd In the case where the distance between the A2SP6 outputs and speaker terminals is high, it is possible to have low frequency EMI issues due to the fact that the typical operating frequency is 25 khz. In this configuration, we recommend using an output filter (as shown DocID2637 Rev 3/37 37

32 Application information A2SP6 in Figure : Typical application schematics on page 4). It should be placed as close as possible to the device. 5. Different examples with summed inputs Example : Dual differential inputs Figure 64. Typical application schematic with dual differential inputs Standby R2 R R R2 C2 Stdby 3k 5k 5k Internal Bias Oscillator PWM B B2 Vcc Output H Bridge Vcc Out+ C3 E2+ E+ E- E2- C - In- In+ + A Out- A2 B3 A3 TS4962 Cs u SPEAKER With (R i in k): Out + Out - A V = = - E E R Out + Out - A V2 = = + - E 2 E R 2.5V V CC R R V IC R 2 + V IC2 R R + R R R V.8V CC E + E E 2 + E 2 V IC = and V 2 IC2 = /37 DocID2637 Rev

33 A2SP6 Application information Example 2: One differential input plus one single-ended input Figure 65. Typical application schematic with one differential input plus one singleended input E2+ C E+ C Standby R2 R R2 R C2 Stdby 3k 5k 5k Internal Bias Oscillator PWM B B2 Vcc Output H Bridge Vcc Out+ C3 E2- C - In- In+ + A Out- A2 B3 A3 TS4962 Cs u SPEAKER With (R i in k): Out + Out - A V = = E R Out + Out - A V2 = = + - E 2 E R 2 C = (F) 2 R F CL DocID2637 Rev 33/37 37

34 Footprint recommendations A2SP6 6 Footprint recommendations Figure 66. Footprint recommendations =25m 5m 5m 75µm min. m max. Track 5m =4m typ. =34m min. 5m min. 5m Non Solder mask opening Pad in Cu 8m with Flash NiAu (2-6m,.2m max.) 34/37 DocID2637 Rev

35 A2SP6 Package information 7 Package information In order to meet environmental requirements, ST offers these devices in different grades of ECOPACK packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: ECOPACK is an ST trademark. Figure 67. Pin-out for 9-bump flip-chip (top view) IN + OUT - /A 2/A2 3/A3 V DD V DD 4/B 5/B2 6/B3 Bumps are underneath Bump diameter = 3m IN - STBY OUT + 7/C 8/C2 9/C3 Figure 68. Marking for 9-bump flip-chip (top view) XXX YWW E ST Logo Symbol for lead-free: E Two first XX product code: W2 third X: Assembly code Three digits date code: Y for year - WW for week The dot is for marking pin A Figure 69. Mechanical data for 9-bump flip-chip.5mm.6 mm.5mm.25mm 6µm.6 mm Die size:.6 mm x.6 mm ±3m Die height (including bumps): 6 m Bump diameter: 35m 5 m Bump diameter before reflow: 3 m m Bump height: 25 m ±4 m Die height: 35 m ±2 m Pitch: 5m 5 m Coplanarity: 5 m max DocID2637 Rev 35/37 37

36 Revision history A2SP6 8 Revision history Table. Document revision history Date Revision Changes 6-Mar-24 Initial release. 36/37 DocID2637 Rev

37 A2SP6 Please Read Carefully: Information in this document is provided solely in connection with ST products. STMicroelectronics NV and its subsidiaries ( ST ) reserve the right to make changes, corrections, modifications or improvements, to this document, and the products and services described herein at any time, without notice. All ST products are sold pursuant to ST s terms and conditions of sale. Purchasers are solely responsible for the choice, selection and use of the ST products and services described herein, and ST assumes no liability whatsoever relating to the choice, selection or use of the ST products and services described herein. No license, express or implied, by estoppel or otherwise, to any intellectual property rights is granted under this document. If any part of this document refers to any third party products or services it shall not be deemed a license grant by ST for the use of such third party products or services, or any intellectual property contained therein or considered as a warranty covering the use in any manner whatsoever of such third party products or services or any intellectual property contained therein. UNLESS OTHERWISE SET FORTH IN ST S TERMS AND CONDITIONS OF SALE ST DISCLAIMS ANY EXPRESS OR IMPLIED WARRANTY WITH RESPECT TO THE USE AND/OR SALE OF ST PRODUCTS INCLUDING WITHOUT LIMITATION IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE (AND THEIR EQUIVALENTS UNDER THE LAWS OF ANY JURISDICTION), OR INFRINGEMENT OF ANY PATENT, COPYRIGHT OR OTHER INTELLECTUAL PROPERTY RIGHT. ST PRODUCTS ARE NOT DESIGNED OR AUTHORIZED FOR USE IN: (A) SAFETY CRITICAL APPLICATIONS SUCH AS LIFE SUPPORTING, ACTIVE IMPLANTED DEVICES OR SYSTEMS WITH PRODUCT FUNCTIONAL SAFETY REQUIREMENTS; (B) AERONAUTIC APPLICATIONS; (C) AUTOMOTIVE APPLICATIONS OR ENVIRONMENTS, AND/OR (D) AEROSPACE APPLICATIONS OR ENVIRONMENTS. WHERE ST PRODUCTS ARE NOT DESIGNED FOR SUCH USE, THE PURCHASER SHALL USE PRODUCTS AT PURCHASER S SOLE RISK, EVEN IF ST HAS BEEN INFORMED IN WRITING OF SUCH USAGE, UNLESS A PRODUCT IS EXPRESSLY DESIGNATED BY ST AS BEING INTENDED FOR AUTOMOTIVE, AUTOMOTIVE SAFETY OR MEDICAL INDUSTRY DOMAINS ACCORDING TO ST PRODUCT DESIGN SPECIFICATIONS. PRODUCTS FORMALLY ESCC, QML OR JAN QUALIFIED ARE DEEMED SUITABLE FOR USE IN AEROSPACE BY THE CORRESPONDING GOVERNMENTAL AGENCY. Resale of ST products with provisions different from the statements and/or technical features set forth in this document shall immediately void any warranty granted by ST for the ST product or service described herein and shall not create or extend in any manner whatsoever, any liability of ST. ST and the ST logo are trademarks or registered trademarks of ST in various countries. Information in this document supersedes and replaces all information previously supplied. The ST logo is a registered trademark of STMicroelectronics. All other names are the property of their respective owners. 24 STMicroelectronics - All rights reserved STMicroelectronics group of companies Australia - Belgium - Brazil - Canada - China - Czech Republic - Finland - France - Germany - Hong Kong - India - Israel - Italy - Japan - Malaysia - Malta - Morocco - Philippines - Singapore - Spain - Sweden - Switzerland - United Kingdom - United States of America DocID2637 Rev 37/37 37