NJU72010

NJU72010 2Vrms Ground Referenced Stereo Line Amplifier with LPF s GENERAL DESCRIPTION The NJU72010 is an audio line Amplifier . It can swing 2Vrms (5.6V peak-to-peak) signal at 3.3V operating voltage. Ground-referenced outputs eliminate output coupling capacitor. The pop noise suppression circuit removes a pop noise at the power-on and power-off. It is suitable for audio line interface of audio equipment which does not have over 9V regulator. s APPLICATIONS q Audio applications requiring 2Vrms outputs s FEATURES q Operating Voltage q Operating Current q q q q q Output Coupling Capacitor-less Pop Noise Suppression Circuit LPF C-MOS Technology Package Outline s PACKAGE OUTLINE NJU72010RB2 NJU72010V +2.7 to +3.6V IDD=5mA typ. + at V =3.3V, RL=47kΩ, No Signal TVSP10, SSOP14 s BLOCK DIAGRAM V + INL Mute Tr OUTL INR Mute Tr Pop Noise Suppression OUTR MUTE Bias Charge Pump CP CN V - GND Ver.2.2E –1– NJU72010 s PIN CONFIGURATION TVSP10 No. Symbol Function 1 10 5 6 1 2 3 4 5 6 7 8 9 10 INL OUTL V+ CP CN VMUTE GND OUTR INR Lch Input Lch Output V+ Power Supply Flying Capacitor Positive Terminal Flying Capacitor Negative Terminal V- Power Supply Mute / Pop Noise Suppression Ground Rch Output Rch Input SSOP14 1 14 No. Symbol Function 7 8 1 2 3 4 5 6 7 8 9 10 11 12 13 14 NC INL OUTL V+ CP CN NC NC VMUTE GND OUTR INR NC NC Lch Input Lch Output V+ Power Supply Flying Capacitor Positive Terminal Flying Capacitor Negative Terminal NC NC V- Power Supply Mute / Pop Noise Suppression Ground Rch Output Rch Input NC –2– NJU72010 s ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER SYMBOL Supply Voltage Power Dissipation Maximum Input Voltage O perating Temperature Range Storage Temperature Range V + RATING +4 (Note1) TVSP10 : 530 (Note1) SSOP14 : 550 + + -V -0.3 ~ V +0.3 -40 ~ +85 -40 ~ +125 UNIT V mW V °C °C PD VIMAX Topr Tstg (Note1) EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting s RECOMMENDED OPERATING CONDITIONS (Ta=25°C unless otherwise specified) PARAMETER Operating Voltage SYMBOL V + TEST CONDITION MIN. 2.7 TYP. 3.3 MAX. 3.6 UNIT V s ELECTRICAL CHARACTERISTICS (Ta=25°C, V =3.3V, f=1kHz, Vin=1Vrms, Mute=OFF, RL=47kΩ unless otherwise specified) + PARAMETER Operating Current Output Gain Output Gain Error Maximum Output Voltage Level Mute Level Equivalent Input Noise Voltage Total Harmonic Distortion Channel Separation Cut-off Frequency Output Offset Voltage Power Supply Rejection Ratio Output Impedance SYMBOL IDD GV ∆GV VOMAX VMUTE VNO THD CS fC VOS PSRR ROUT TEST CONDITION No signal MIN. 5.2 -0.5 TYP. 5 6.2 0 2.3 -110 -106 0.003 150 1 45 300 MAX. 10 7.2 0.5 200 5 - UNIT mA dB dB Vrms dB dB % dB kHz mV dB Ω THD=1% Rg=0Ω, Mute=ON Rg=0Ω, BW:400Hz-22kHz BW:400Hz-22kHz Rg=600Ω 2 nd 80 100 - order LPF Rg=0Ω Vripple=1kHz / 100mVrms s CONTROL CHARACTERISTICS + (Ta=25°C, V =3.3V, RL=47kΩ unless otherwise specified) PARAMETER Mute terminal High Mute terminal Low SYMBOL MuteH MuteL TEST CONDITION Mute=OFF Mute=ON MIN. 0.8V 0 + TYP. - MAX. V + + UNIT V V 0.2V –3– NJU72010 TEST CIRCUIT (IDD) 1uF C2 1 INL INR 1uF 10 C8 V+ 2 OUTL Mute-Tr Mute-Tr OUTR 9 A 3 V+ Pop Noise Suppression GND 8 V+ 4 1uF C4 CP Charge Pump Bias MUTE 7 5 CN V- C6 10uF 6 TEST CIRCUIT (GV, VOMAX, THD) 1uF C2 1 INL INR 1uF 10 C8 2 47kΩ OUTL Mute-Tr Mute-Tr OUTR 9 V 47kΩ V V+ 10uF C11 3 V+ Pop Noise Suppression GND 8 V+ 4 1uF C4 CP Charge Pump Bias MUTE 7 5 CN V- C6 10uF 6 –4– NJU72010 TEST CIRCUIT (VMUTE) 1uF C2 1 INL INR 1uF 10 C8 2 47kΩ OUTL Mute-Tr Mute-Tr OUTR 9 V 47kΩ V V+ 10uF C11 3 V+ Pop Noise Suppression GND 8 4 1uF C4 CP Charge Pump Bias MUTE 7 5 CN V- C6 10uF 6 TEST CIRCUIT (VNO) VNO=(measurement)-Gv1 1uF C2 1 INL INR 1uF 10 C8 2 47kΩ OUTL Mute-Tr Mute-Tr OUTR 9 V 47kΩ V V+ 10uF C11 3 V+ Pop Noise Suppression GND 8 V+ 4 1uF C4 CP Charge Pump Bias MUTE 7 5 CN V- C6 10uF 6 –5– NJU72010 TEST CIRCUIT (CS) 1uF C2 1 INL INR 1uF Rg=600Ω 10 C8 2 47kΩ V+ 10uF C11 OUTL Mute-Tr Mute-Tr OUTR 9 V 47kΩ 3 V+ Pop Noise Suppression GND 8 V+ 4 1uF C4 CP Charge Pump Bias MUTE 7 C7 5 CN V- C6 10uF 6 TEST CIRCUIT (fC) 1uF 1kΩ R1 C2 C3 1 INL INR 10 C9 1kΩR3 1uF 820pF C8 820pF OUTL Mute-Tr V+ 10uF C11 2 RL=47kΩ OUTR Mute-Tr 9 V RL=47kΩ V 3 V+ Pop Noise Suppression GND 8 V+ 4 1uF C4 CP Charge Pump Bias MUTE 7 5 CN V- C6 10uF 6 –6– NJU72010 TEST CIRCUIT (VOS) 1uF C2 1 INL INR 1uF 10 C8 2 V V+ 10uF C11 OUTL Mute-Tr Mute-Tr OUTR 9 V 3 V+ Pop Noise Suppression GND 8 V+ 4 1uF C4 CP Charge Pump Bias MUTE 7 C7 5 CN V- C6 10uF 6 TEST CIRCUIT (PSRR) Vripple=1kHz / 100mVrms 1uF C2 1 INL INR 1uF 10 C8 2 47kΩ OUTL Mute-Tr Mute-Tr OUTR 9 V 47kΩ V V+ 3 V+ Vripple C11 10uF Pop Noise Suppression GND 8 V+ 4 1uF C4 CP Charge Pump Bias MUTE 7 5 CN V- C6 10uF 6 –7– NJU72010 APPLICATION CIRCUIT 2 nd order LPF 1uF 1kΩ 820pF 1 INL INR 10 1kΩ 1uF 820pF 2 V+ 10uF + OUTL Mute-Tr Mute-Tr OUTR 9 3 V+ Pop Noise Suppression GND 8 4 1uF CP Charge Pump Bias MUTE 7 22kΩ 4.7uF 10uF 5 CN V- 6 + –8– NJU72010 APPLICATION NOTE The NJU72010 is an audio line amplifier that eliminates the need for external dc-blocking output capacitors. The NJU72010 has built-in pop suppression circuitry to eliminate disturbing pop noise during power-on, power-off and mute-control. 1. Operating Principle The NJU72010 has the built-in non-inverted input operational amplifiers, voltage inverter, and pop noise suppression circuitry (Fig.1). The voltage inverter for NJU72010 eliminates the need for external dc-blocking output capacitors. The pop suppression circuitry for NJU72010 eliminates the pop noise during power-on, power-off and mute-control. 1uF 1kΩ C2 R1 C3 1 INL INR 10 C9 1kΩ R31uF 820pF C8 820pF 2 V+ 10uF + C11 OUTL Mute-Tr Mute-Tr OUTR 9 3 V+ Pop Noise Suppression GND 8 4 1uF C4 CP Charge Pump Bias MUTE 7 C7 22kΩ 4.7uF R2 5 CN V- 6 C6 10uF + Fig.1 The NJU72010 functional block diagram 1.1 External parts 1.1.1 Input coupling capacitors Ci (C2, C8) The input coupling capacitor (Ci) and the total of the external resistance (R1, R3) and the input resistance (Rin=218kΩ typ.) for the non-inverted terminal form a high-pass filter with the corner frequency determined in [fc=1/(2π x (R1+218kΩ) x Ci)). It is necessary to adjust 1uF or more. –9– NJU72010 1.1.2 Flying capacitor (C4) Use capacitors with a low-ESR (ex. ceramic capacitors) for optimum performance. Design to provide low impedance for the wiring between CP terminal (4pin), CN terminal (5pin), and the flying capacitor (C4). CP(4pin) C4=1uF CN(5pin) Fig.2 The NJU72040 block diagram (4pin, 5pin) 1.1.3 Hold capacitor (C6) Use capacitors with a low-ESR (ex. ceramic capacitors) for optimum performance. Design to provide low impedance for the wiring between the hold capacitor (C6), V- terminal (6pin) and the GND on the PCB. Separate the GND pattern connecting to the hold capacitor (C6) from that connecting to the GND terminal (8pin), thus suppressing the influence of switching noise by removing the common impedance of the GND wiring. Design no short-circuits of V- terminal (6pin) and V+ terminal (3pin) on the PCB pattern. V-(6pin) C6 GND(8pin) Fig.3 The NJU72010 block diagram (6pin, 8pin) 1.1.4 Mute terminal pop noise countermeasures (R2, C7) Mute terminal needs time constant more than R2 x C7=0.1. It is necessary to adjust 22kΩ or less. MUTE(7pin) R2=22kΩ Vcnt C7=4.7uF 400kΩ Fig.4 The NJU72010 block diagram (7pin) – 10 – NJU72010 1.2 Control of V+ terminal and Mute terminal 1.2.2 Power-on procedure 1. Turn on the V+. 2. After 100msec from power on, change the control voltage of MUTE terminal (Vcnt) from "Low" to "High". * It is necessary to stabilize an IC for 100msec. By releasing the MUTE function, the output terminal output the signal. 1.2.3 Power-off procedure 1. Change the control voltage of MUTE terminal (Vcnt) from "High" to "Low". By the MUTE function, the output signals are stopped from output terminal. 2. Turn off the V+ after “2RC” sec from MUTE. * It is necessary to stabilize a MUTE condition for “2RC” sec. Ex.) R2=22kΩ, C7=4.7uF -> 2R2 x C7=200msec V+ (3pin t 100msec Vcnt 200msec MUTE MUT (7pin) MUTE MUTE t t Fig.5 Power-on / Power-off timing chart – 11 – NJU72010 TERMINAL DESCRIPTION Terminal SYMBOL FUNCTION EQUIVALENT CIRCUIT V+ VOLTAGE 1 10 INL INR 18k Ω AC Input 30pF 200k Ω VGND 1k Ω 0V VDD 2 9 OUTL OUTR 100Ω 200Ω 8.68k Ω AC Output 1k Ω 7k Ω VGND 0V V+ 3 V+ Supply Voltage V+ V- V+ 4 CP Flying Capacitor Positive Terminal - V- GND TERMINAL DESCRIPTION – 12 – NJU72010 Terminal SYMBOL FUNCTION EQUIVALENT CIRCUIT V+ VOLTAGE 5 CN Flying Capacitor Negative Terminal - V- GND V+ 6 V- V- Voltage -[V+] V- V+ 100Ω 7 MUTE MUTE/Pop Noise Suppression 0V 400k Ω VGND – 13 – NJU72010 TYPICAL CHARACTERISTICS Supply Current vs Supply Voltage No signal 8 3.0 Maxim um Output Voltage vs Supply Voltage THD=1%, RL=47kohm, I/O: INL-OUTL 6 Supply Current [mA] 25OC Maximum Output Voltage [Vrms ] -40OC 2.5 4 85OC 2.0 -40, 25, 85OC 2 1.5 0 0 1 2 Supply Voltage [V] M axim um Output Voltage vs Frequency V +=3.3V, THD=1%, RL=47kohm, I/O: INL-OUTL 3.0 3 4 1.0 2.5 3.0 3.5 4.0 Supply Voltage [V] Maxium Output Voltage vs Load Resistance V +=3.3V, f=1kHz ,I/O: INL-OUTL 3.0 Maximum Output Voltage [Vrms ] 2.5 25, 85OC Maximum Output Voltage [Vrms ] 2.5 25, 85OC 2.0 -40OC 2.0 -40OC 1.5 1.5 1.0 10 100 1000 Frequency [Hz] Gain vs Frequency V +=3.3V, Vout=2Vrms, RL=47kohm, I/O: INL-OUTL 2nd Order LPF NJU72011 9 8 7 6 5 4 NJU72010 THD+N [%] 10000 100000 1.0 1000 10000 RL[Ω] 100000 10 1 THD+N vs Output Voltage V +=3.3V, Ta=25OC, RL=47kohm, I/O: INL-OUTL BW:10-22kHz (f=100Hz), 400-22kHz (f=1k,10kHz) 0.1 Gain [dB] 100Hz 0.01 10kHz 1kHz 3 10 100 1000 10000 100000 1000000 0.001 0.1 1 Output Voltage [Vrms] 10 Frequency [Hz] – 14 – NJU72010 TYPICAL CHARACTERISTICS THD+N vs Frequency V +=3.3V, RL=47kohm, Vout=2Vrms, I/O: INL-OUTL BW:10-80kHz Channel Separation vs Frequency V *=3.3V, RL=47kohm, Vout=2Vrms, I/O:INL-OUTR Filter=Bandpass 1 -40 85OC 0.1 THD+N [%] 25OC Channel Separation[dB] -60 -80 -40OC 0.01 -40OC -100 25, 85OC 0.001 10 100 1000 Frequency [Hz] PSRR vs. Frequency V +=3.3V, Vripple=100mVrms, f=1kHz, Filter=Bandpass -20 20 0 -20 Mute Level [ dB ] -40 -60 -80 -40,25OC -70 -100 -120 10 100 1000 Frequency [ Hz ] 10000 100000 0 1 2 Mute Control Voltage [ V ] 3 4 10000 100000 -120 10 100 1000 Frequency [Hz] Mute Control Voltage vs. Mute Level V +=3.3V, Vout=2Vrms, f=1kHz, Filter=Bandpass 10000 100000 -30 -40 PSRR [ dB ] 85OC 85OC -50 -60 -40,25OC -80 [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. – 15 –