HIGH-POWER & LOW-VOLTAGE AUDIO POWER AMPLIFIER
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- Hubert Bridges
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1 NJU784 HIGH-POWER & LOW-VOLTAGE AUDIO POWER AMPLIFIER GENERAL DESCRIPTION The NJU784 is an audio power amplifier designed for telephone applications. No external coupling capacitors are required because of the differential outputs. The closed loop gain is adjusted by two external resistors, and a SD pin permit power down with muting the input signal. The NJU784 improves high output power compared with other amplifier. PACKAGE OUTLINE NJU784R APPLICATION Cell Phone, PHS Portable Telephone, Wireless Telephone White Goods Security Alarm Monitor FEATURES Operating Voltage V =2.8 to 5.5V Operating Current I DD =2.5mA typ. (V =5V,R L =, no signal) I DD =2mA typ. (V =3V,R L =, no signal) Supply Current in Shutdown Mode I DD2 =2µA max. Output Power P =W typ. (V =5V,R L =8Ω,THD=2%) P =4mW typ.(v =3V,R L =4Ω,THD=2%) Thermal Shutdown Circuit C-MOS Technology Package Outline VSP8 PIN CONFIGURATION & BLOCK DIAGRAM V -IN IN AmpA. SD 2. SDTC 3. IN 4. -IN V AmpB SDTC BIAS TSD SD --
2 NJU784 ABSOLUTE MAXIMUM RATINGS (Ta=25 C) PARAMETER SYMBOL RATINGS UNIT Supply Voltage V 7 V Power Dissipation P D 96 * ) (VSP8) mw Output Peak Current I op 5 ma Input Voltage Range V IN -.3 to V.3 * 2) V Operating Temperature Range T opr -4 to 85 C Storage Temperature Range T stg -4 to 5 C * ) EIA/JEDEC STANDARD Test board (76.2 x 4.3 x.6mm, 4layers, FR-4) mounting * 2) SD, SDTC, IN, IN-,, terminals. RECOMMENDED OPERATING VOLTAGE RANGE (Ta=25 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Voltage Range V V ELECTRICAL CHARACTERISTICS Amplifier (Ta=25 C,V =5V,G V =6dB,f=kHz,R L =8Ω,Active) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Current I DD No signal, R L =, Active ma Operating Current 2 I DD2 No signal, R L =, V SD =.25V µa Output Power P O THD 2%.8 - W Total Harmonic Distortion (THDN) THD P O =4mW -. - % Supply Voltage Rejection C=µF,C2=2.2µF PSRR Raito Vripple=mVrms db Mute Attenuation MAT Shutdown db Input Resistance R SD SD Terminal kω Output Offset Voltage V OD V IN =V -5-5 mv (Ta=25 C,V =3V,G V =6dB,f=kHz,R L =4Ω,Active) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT Operating Current I DD No signal, R L =, Active ma Operating Current 2 I DD2 No signal, R L =, V SD =.25V µa Output Power P O THD 2% mw Total Harmonic Distortion (THDN) THD P O =2mW -. - % Supply Voltage Rejection C=µF,C2=2.2µF PSRR Raito Vripple=mVrms db Mute Attenuation MAT Shutdown db Output Offset Voltage V OD V IN =V -5-5 mv V SD: SD Terminal Voltage Mode Control (Ta=25 C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT High Level Input Voltage V IH -.7V - V V Low Level Input Voltage V IL CONTROL TERMINAL EXPLANATION MODE CONTROL SIGNAL (SD Terminal) STATUS Shutdown L(=V IL ) IC is standby. Active H(=V IH ) IC is active
3 NJU784 TEST CIRCUIT TEST CIRCUIT (Operating Current I DD, I DD2 ) Rf=2kΩ V A µf Vin Ci =µf Ri=2kΩ C=µF -IN IN 5kΩ AmpA 2kΩ 2kΩ RL 4Ω/8Ω C2=2.2µF SDTC 75kΩ AmpB 5kΩ V BIAS TSD IDD:SD=H IDD2:SD=L SD TEST CIRCUIT2 (Output Power P O, Total Harmonic Distortion THD) Rf=2kΩ V Vin Ci =µf Ri=2kΩ C=µF -IN IN AmpA RL 4Ω/8Ω V AmpB C2=2.2µF SDTC V BIAS TSD SD - 3 -
4 NJU784 TEST CIRCUIT TEST CIRCUIT3 (Supply Voltage Rejection Raito PSRR) Rf=2kΩ µf V Ci =µf Ri=2kΩ C=µF -IN IN 5kΩ AmpA 2kΩ 2kΩ RL 4Ω/8Ω V C2=2.2µF SDTC 75kΩ AmpB 5kΩ V BIAS TSD SD TEST CIRCUIT4 (Output Offset Voltage V OD ) Rf=2kΩ V µf Ci =µf Vin Ri=2kΩ C=µF -IN IN 5kΩ AmpA 2kΩ 2kΩ RL 4Ω/8Ω V C2=2.2µF SDTC 75kΩ AmpB 5kΩ V BIAS TSD SD - 4 -
5 NJU784 EQUIVALENT CIRCUIT PIN No. SYMBOL EQUIVALENT CIRCUIT TERMINAL VOLTAGE Note SD k 2 SDTC 3k 2 V / k 3 IN V / k 4 -IN 67.5 V /2-5 -
6 NJU784 EQUIVALENT CIRCUIT PIN No. SYMBOL EQUIVALENT CIRCUIT TERMINAL VOLTAGE Note 5 8 V /2 6 7 V
7 NJU784 APPLICATION CIRCUIT Rf=2kΩ V µf Vin Ci =.47µF Ri=2kΩ -IN IN AmpA 2kΩ C=µF 5kΩ 2kΩ AmpB C2=2.2µF SDTC 75kΩ 5kΩ BIAS Shutdown Control SD TSD -7-
8 NJU784 TYPICAL CHARACTERISTICS Supply Current vs Supply Voltage RL=OPEN,Ta=25 O C Supply Current[mA] Supply Voltage[V] Supply Current vs Temparature V=3V Gv=6dB RL=OPEN Supply Current vs Temparature V=5V Gv=6dB RL=OPEN Supply Current[mA] 2.5 Supply Current[mA] Temparature[ o C] Temparature[ o C] Supply Current vs Temparature(STANBY) V=3V,RL=OPEN,VSD=.25V Supply Current vs Temparature(STANBY) V=5V,RL=OPEN,VSD=.25V.E.E.E-.E-.E-2.E-2.E-3.E-3 Supply Current[A].E-4.E-5.E-6.E-7 Supply Current[A].E-4.E-5.E-6.E-7.E-8.E-8.E-9.E-9.E-.E-.E-.E Temparature[ o C] Temparature[ o C] - 8 -
9 NJU784 TYPICAL CHARACTERISTICS VSD pin Voltagevs Supply Current(Ta) V=3V RL=OPEN VSD pin Voltage vs Supply Current(Ta) V=5V RL=OPEN.E-2.E-2 Supply Current[A].E-3.E-4.E-5.E-6.E-7.E-8 Ta=85 o C.E-9 Ta=25 o C.E-.E- Ta=-4 o C.E VSD pin Voltage[V] Supply Current[A].E-3.E-4.E-5.E-6.E-7.E-8 Ta=85 o C.E-9 Ta=25 o C.E- Ta=-4.E- o C VSD pin Voltage[V] Voltage Gain[dB] Voltage Gain.Phase vs Frequency V=3V Gv=4dB RL=4Ω Ta=25 o C Gain Phase E2.E3.E4.E5.E6.E7.E8 Frequency[Hz] 9 45 Phase[deg.] Voltage Gain[dB] Voltage Gain.Phase vs Frequency V=5V Gv=4dB RL=8Ω Ta=25 o C Gain Phase E2.E3.E4.E5.E6.E7.E8 Frequency[Hz] Phase[deg.] 6 Voltage Gain.Phase vs Frequency V=3V,Gv=4dB,RL=OPEN, Ta=25 o C Voltage Gain.Phase vs Frequency V=5V,Gv=4dB,RL=OPEN, Ta=25 o C 225 Phase Phase Voltage Gain[dB] 2-2 Gain Voltage Gain[dB] 2-2 Gain E2.E3.E4.E5.E6.E7.E8 Frequency[Hz] E2.E3.E4.E5.E6.E7.E8 Frequency[Hz] - 9 -
10 NJU784 TYPICAL CHARACTERISTICS Total Harmonic Distortion vs Output Pow er(ta) V =3V,Gv=6dB,f=kHz,RL=4Ω Total Harmonic Distortion vs Output Pow er(ta) V=5V,Gv=6dB,f=kHz,RL=8Ω Ta=85 o C Ta=85 o C THDN[%]. Ta=-4 o C Ta=25 o C THDN[%]. Ta=-4 o C Ta=25 o C Total Harmonic Distortion vs Output Pow er (f) V=3V,Gv=6dB,,RL=4Ω,BW:~8kHz Total Harmonic Distortion vs Output Pow er (f) V=5V,Gv=6dB,RL=8Ω,BW:~8kHz THDN[%] f=2khz THDN[%] f=2khz. f=khz. f=khz Total Harmonic Distortion vs Output Pow er (f) V=3V,Gv=6dB,,RL=8Ω,BW:~8kHz THDN[%]. f=2khz f=khz
11 NJU784 TYPICAL CHARACTERISTICS Output Voltage vs Supply Voltage (THD) RL=4Ω,Ta=25 o C Output Voltage vs Supply Voltage (THD) RL=8Ω,Ta=25 o C.2 2 THD=%.5 Output Power[W] THD=% Output Power[W] THD=%.2.5 THD=% Supply Voltage[V] Supply Voltage[V] Pow er Dissipation vs Output Pow er V=5V Gv=6dB RL=8Ω,Ta=25 o C Pow er Dissipation vs Output Pow er(rl) V=3V,Gv=6dB,Ta=25 o C Power Dissipation[W] Power Dissipation[W] RL=4Ω RL=8Ω PSRR vs Frequency V=3V,RL=4Ω,Ta=25,RIN= PSRR vs Frequency V=5V,RL=8Ω,Ta=25 o C,RIN= Ta=85 o C 6 5 Ta=85 o C PSRR[dB] Ta=-4 o C Ta=25 o C PSRR[dB] Ta=-4 o C Ta=25 Frequency[Hz] Frequency[Hz] --
12 NJU784 TYPICAL CHARACTERISTICS 2.5 Thermal Shutdow n Supply Current vs Temparature V=3V RL=OPEN 3 Thermal Shutdow n Supply Current vs Temparature V=5V RL=OPEN Supply Current[mA].5 Supply Current[mA] Temparature[ o C] Temparature[ o C] [CAUTION] The specifications on this databook are only given for information, without any guarantee as regards either mistakes or omissions. The application circuits in this databook are described only to show representative usages of the product and not intended for the guarantee or permission of any right including the industrial rights
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