TDA7433 BASIC FUNCTION AUDIO PROCESSOR TWO STEREO AND ONE MONO INPUTS CONTROLLED MUTE FUNCTION (SOFTWARE AND HARD- WARE) VOLUME CONTROL IN db STEP FOUR SPEAKER ENUATORS: Independent attenuation control Independent mute function ALL FUNCTIONS PROGRAMMABLE VIA I 2 CBUS DESCRIPTION The TDA7433 is a volume, tone (bass and treble) balance (Left/Right) processor for quality audio applications in car radio and Hi-Fi systems. Control is accomplished by serial bus microprocessor interface. The AC signal setting is obtained by resistor networks and switches combined with operational amplifiers. BLOCK DIAGRAM IN_L IN2_L MONO IN/MUTE 6 3 4 MU nf 4.7K VOL BASS TREBLE S BUS DECODER + LATCHES Thanks to the advanced BIPOLAR/CMOS Technology, the external components have been reduced. nf 9 2.7nF BINL BOUTL TRL SO2 ORDERING NUMBER: TDA7433D LEFT FRONT LEFT REAR 6 4 8 9 SCL SDA IN2_R IN_R VS 2 5 7 MU SUPPLY VOL BASS TREBLE 5 3 RIGHT FRONT RIGHT REAR 2 GND 8 7 2 CREF BINR BOUTR TRR 2.7nF nf nf 4.7K D95AU354A November 999 /
ABSOLUTE MAIMUM RATINGS Symbol Parameter Value Unit V S Operating Supply Voltage.2 V T amb Operating Temperature Range -4 to 85 C T stg Storage Temperature Range -55 to +5 C QUICK REFERENCE DATA Symbol Parameter Min. Typ. Max. Unit V S Supply Voltage 7 9.2 V V CL Max. Input Signal Handling.3.6 Vrms THD Total Harmonic Distortion (V = Vrms f = khz).5 % S/N Signal to Noise Ratio 2 db Sc Channel Separation f = khz db PIN CONNECTION (Top View) Volume Control db step -79 +32 db Bass Control 2dB step -8 +8 db Treble Control 2dB step -4 +4 db Speaker Attenuators -37.5 db Mute Attenuation db CREF IN2_R IN2_L MONO IN/MUTE IN_R IN_L BOUT_R BIN_R BOUT_L BIN_L 2 2 9 3 8 4 7 5 6 6 5 7 4 8 3 9 2 D95AU355A GND SDA SCL V S OUT_LF OUT_RF OUT_LR OUT_RR TRR TRL THERMAL DATA Symbol Parameter Value Unit R th j-pins Thermal Resistance Junction-pins Max. 5 C/W 2/
APPLICATION DIAGRAM nf 4.7K nf 2.7nF V S 9V nf nf nf nf nf nf IN_L IN2_L MONO/ MUTE IN2_R IN_R V S 6 3 4 2 5 7 2 SUPPLY GND MU MU BINL BOUTL TRL 9 VOL BASS TREBLE S BUS DECODER + LATCHES VOL BASS TREBLE 8 7 2 CREF BINR BOUTR TRR µf nf nf 4.7K 2.7nF 6 4 8 9 5 3 D95AU356A LEFT FRONT LEFT REAR SCL SDA RIGHT FRONT RIGHT REAR 3/
ELECTRICAL CHARACTERISTICS (Tamb = 25 C, VS = 9V, RL = kω, Rg = 5Ω, all variable gains = db, f = khz, unless otherwise specified.) Symbol Parameter Test Condition Min. Typ. Max. Unit INPUT SELECTOR R IN Input Resistance 7 3 kω V CL Clipping Level d.3%.3.6 Vrms S IN Input Separation 7 db A MUTE Input Mute Attenuation 7 95 db V DC Mute DC Step.2 mv MUTE AT AM INPUT (*) V IL Input Low Voltage AM not selected.4 V VOLUME CONTROL G MA Max. Gain Note 2 3.5 32 33.5 db A MA Max Attenuation 75 79 83 db A step Step Resolution.5.5 db E A Attenuation Set Error G = +2 to -2dB -. +. db G = -2 to -6dB -2 2 db E T Tracking Error G = -2 to -6dB 2 db V DC DC Steps Adjacent Attenuation Steps,. 4 mv Range from to -79dB From db to -79dB.5 mv BASS CONTROL B RANGE Max. Bass boost 5.5 8 2 db B CUT Max. Bass cut -2-8 5.5 db A Step Step Resolution 2 3 db R B Internal Feedback Resistance 48 65 82 kω TREBLE CONTROL C RANGE Control Range ±3 ±4 ±5 db A step Step Resolution 2 3 db SPEAKER ENUATORS C RANGE Control Range 36 37.5 39 db A step Step Resolution From to -24dB.5.5 db A MUTE Output Mute Attenuation From to -24dB 7 9 db E A Attenuation Set Error db V DC DC Steps Adjacent Attenuation Steps. 4 mv AUDIO OUTPUTS V CLIP Clipping Level d =.3% 2 2.5 Vrms G OUT Output Gain (fixed) 4 db R L Output Load Resistance AC - connected 3 kω DC connected to GND 5 C L Output Load Capacitance nf R OUT Output Impedance 3 Ω VDC DC Voltage Level 3.7 4. 4.3 V (*) The mute function can be activated without using the I2C bus by grounding the AM input when AM is not selected. This causes the input multiplexer to select the reference voltage instead of an input signal. 4/
ELECTRICAL CHARACTERISTICS (continued) Symbol Parameter Test Condition Min. Typ. Max. Unit GENERAL V S Supply Voltage 6 9.2 V I S Supply Current 5 8 ma PSRR Power Supply Rejection Ratio 65 85 db e NO Output Noise 2Hz - 2kHz "A" - weighted BW = 2Hz - 2kHz, flat output muted S/N Signal to Noise Ratio all gains = db; V O = Vrms 2 db d Distortion V OUT = Vrms.5.5 % Sc Channel Separation 7 8 db E T Total Tracking Error A V = to -2dB A V = -2 to -6dB 2 db db BUS INPUTS V IL Input Low Voltage V V IH Input High Voltage 3 V I IN Input Current V IN =.4V -5 +5 µa V O Output Voltage SDA Acknowledge I O =.6mA.5.4 V SOFTWARE SPECIFICATION Interface Protocol The interface protocol comprises: a start condition (S) a chip address byte (the bit determines read /write transmission) a subaddress byte a sequence of data (N-bytes + acknowledge) a stop condition (P) MSB CHIP ADDRESS SUBADDRESS MSB MSB S R/W ACK I A 3 A 2 A A ACK DATA ACK P ACK = Acknowledge S = Start P = Stop MA CLOCK SPEED 5kbits/s 4 7. 5.5 DATA...DATA n 2 µv µv µv Auto Increment If bit I in the subaddress byte is set to "", the autoincrement of the subaddress is enabled. 5/
SUBADDRESS (receive mode) MSB I A3 A2 A A Input selector Volume Bass, Treble Speaker attenuator LF Speaker attenuator LR Speaker attenuator RF Speaker attenuator RR FUNCTION I = Auto increment = Not used DATA BYTE SPECIFICATION = not relevant; set to "" during testing Input Selector MSB D 7 D 6 D 5 D 4 D 3 D 2 D D FUNCTION IN2 IN mono IN no input selected mute (low homic) non-symmetrical bass cut (note ) symmetrical bass cut extended bass range standard bass range ±4dB For example to select the IN2 input the Data Byte is:. An additional direct mute function is included in the Speaker Attenuators. Note : Bass cut for very low frequencies. MSB D 7 D 6 D 5 D 4 D 3 D 2 D D +32dB +6dB db -6dB -32dB -48dB -64dB db -db -2dB -5dB VOLUME Note 2: It is not recommended to use a gain more than 2dB for system performance reason. In general, the max. gain should be limited by software to the maximum value, which is needed for the system. 6/
Bass, Treble D4 Input Selector MSB D 7 D 6 D 5 D 4 D 3 D 2 D D Treble Steps - 4dB -2dB -db -8dB -6dB -4dB -2dB db db +2dB +4dB +6dB +8dB +db +2dB +4dB Bass Steps -8dB -6dB -4dB -2dB -db -8dB -6dB -4dB -2dB normal db range db ±4dB +2dB +4dB +6dB +8dB +db +2dB +4dB +6dB +8dB For example 2dB Treble and -8dB Bass give the following DATA BYTE: Speaker Attenuators FUNCTION MSB SPEAKER ENUATOR D 7 D 6 D 5 D 4 D 3 D 2 D D LF,LR,RF,RR : db -db : -24dB -25.5dB -27dB -28.5dB -3dB -32dB -34.5dB -37.5dB Speaker Mute 7/
Functional Description The input selector is able to select 2 stereo inputs and mono input (AM). The inputs are DC biased with kω resistors to the internal reference voltage of 3V. The mono input can be used additionally as hardware mute pin. If this pin is pulled to ground by an external transistor and AM is not selected, the input selector mutes the input (reference voltage selected). The AM part is considered to be switched OFF. If the output of the AM part is not high ohmic in this condition, a series resistor of about 2kΩ has to be foreseen. The volume control can be programmed from a gain of +32dB to an attenuation of -79dB in db steps. The maximum gain should be kept as low as possible for system performance reason. It has to be limited by software to the absolute necessary system gain, depending on the signal source level and the power amplifier gain. The bass control acts in a range from +8dB to - 8dB in 2dB steps. The filter response is determined by the external filter components. An extensive simulation software is available in order to support the design of the bass filter response with different filter configurations. The extended bass boost range of +8dB allows the implementation of the software loudness function by additional bass and treble boost. The treble control acts in a range of ±4dB in 2dB steps. The external capacitor determines with the internal resistor of 5KΩ the corner frequency of the treble response. The four speaker attenuators can be controlled independently from to -37.5dB, which allows the implementation of balance and fader a the four speaker system. The attenuation steps size is db from to -24dB and increases non linearly up to the maximum attenuation of 37.5dB. A special mute bit forces the speaker attenuator into the mute position. All 4 outputs are low distortion push pull outputs, able to drive a load of 3kΩ. 8/
DIM. mm inch MIN. TYP. MA. MIN. TYP. MA. OUTLINE AND MECHANICAL DATA A 2.35 2.65.93.4 A..3.4.2 B.33.5.3.2 C.23.32.9.3 D 2.6 3.496.52 E 7.4 7.6.29.299 e.27.5 H.65.394.49 h.25.75..3 L.4.27.6.5 K B (min.)8 (max.) D e A L K SO2 h x 45 H A C 2 E SO2MEC 9/
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