NJU72011 2Vrms Ground Referenced Stereo Line Amplifier with LPF ■ PACKAGE OUTLINE ■ GENERAL DESCRIPTION The NJU72011 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. NJU72011RB2 NJU72011V ■ APPLICATIONS ● Audio applications requiring 2Vrms outputs ■ FEATURES ● Operating Voltage ● Operating Current ● ● ● ● ● +2.7 to +3.6V IDD=5mA typ. + at V =3.3V, RL=47kΩ, No Signal Output Coupling Capacitor-less Pop Noise Suppression Circuit LPF C-MOS Technology Package Outline TVSP10, SSOP14 ■ BLOCK DIAGRAM V + OUTL INL Mute Tr OUTR INR Mute Tr Pop Noise Suppression V MUTE Bias GND Ver.1.2E - Charge Pump CP CN –1– NJU72011 ■ PIN CONFIGURATION TVSP10 1 10 5 6 No. Symbol 1 2 3 4 5 6 7 8 9 10 INL OUTL V+ CP CN VMUTE GND OUTR INR No. Symbol 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 Function 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 –2– 1 14 7 8 Function 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 NJU72011 ■ ABSOLUTE MAXIMUM RATING (Ta=25°C) PARAMETER SYMBOL + Supply Voltage V Power Dissipation PD RATING UNIT V mW Maximum Input Voltage VIMAX +4 (Note1) TVSP10 : 530 (Note1) SSOP14 : 550 + + -V -0.3 ~ V +0.3 Operating Temperature Range Topr -40 ~ +85 °C Storage Temperature Range Tstg -40 ~ +125 °C V (Note1) EIA/JEDEC STANDARD Test board (76.2x114.3x1.6mm, 2layer, FR-4) mounting ■ RECOMMENDED OPERATING CONDITIONS (Ta=25°C unless otherwise specified) PARAMETER Operating Voltage SYMBOL TEST CONDITION + V MIN. TYP. MAX. UNIT 2.7 3.3 3.6 V MIN. TYP. MAX. UNIT - 5 10 mA ■ ELECTRICAL CHARACTERISTICS + (Ta=25°C, V =3.3V, f=1kHz, Vin=1Vrms, Mute=OFF, RL=47kΩ unless otherwise specified) PARAMETER SYMBOL TEST CONDITION Operating Current IDD Output Gain GV 8 9 10 dB ∆GV -0.5 0 0.5 dB Output Gain Error No signal Maximum Output Voltage Level VOMAX THD=1% - 2.3 - Vrms Mute Level VMUTE Rg=0Ω, Mute=ON - -110 - dB Equivalent Input Noise Voltage VNO Rg=0Ω, BW:400Hz-22kHz - -106 - dB Total Harmonic Distortion THD BW:400Hz-22kHz - 0.003 - % 80 - - dB 100 150 200 kHz Rg=0Ω - 1 5 mV Vripple=1kHz / 100mVrms - 45 - dB - 300 - Ω TYP. MAX. UNIT Channel Separation Cut-off Frequency Output Offset Voltage Power Supply Rejection Ratio Output Impedance CS fC VOS PSRR Rg=600Ω 2 nd order LPF ROUT ■ 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 + - + V V + 0.2V V –3– NJU72011 TEST CIRCUIT (IDD) 1uF 1 INL INR 1uF 10 C2 C8 2 V+ OUTL OUTR Mute-Tr 9 Mute-Tr A 3 V+ 4 GND Pop Noise Suppression CP V+ MUTE Bias 1uF 8 7 Charge Pump C4 5 CN V- INL INR C6 10uF 6 TEST CIRCUIT (GV, VOMAX, THD) 1uF 1 1uF 10 C2 C8 2 47kΩ OUTL V OUTR Mute-Tr 9 V Mute-Tr 47kΩ V+ 10uF 3 V+ Pop Noise Suppression C11 4 CP 1uF 8 V+ MUTE 7 Charge Pump C4 5 –4– Bias GND CN V- C6 6 10uF NJU72011 TEST CIRCUIT (VMUTE) 1uF 1 INL INR 1uF 10 C2 C8 2 47kΩ OUTL V OUTR Mute-Tr 9 V Mute-Tr 47kΩ V+ 10uF 3 V+ 4 CP 1uF GND Pop Noise Suppression C11 MUTE Bias 8 7 Charge Pump C4 5 CN V- INL INR C6 10uF 6 TEST CIRCUIT (VNO) VNO=(measurement)-Gv1 1uF 1 1uF 10 C2 C8 2 47kΩ OUTL V OUTR Mute-Tr 9 V Mute-Tr 47kΩ V+ 10uF 3 V+ Pop Noise Suppression C11 4 CP 1uF Bias GND 8 V+ MUTE 7 Charge Pump C4 5 CN V- C6 10uF 6 –5– NJU72011 TEST CIRCUIT (CS) 1uF 1 INL INR 1uF Rg=600Ω 10 C2 C8 2 OUTL OUTR 47kΩ Mute-Tr 9 V Mute-Tr 47kΩ V+ 10uF 3 V+ 4 CP 1uF GND Pop Noise Suppression C11 V+ MUTE Bias 5 7 C7 Charge Pump C4 8 CN V- INL INR C6 10uF 6 TEST CIRCUIT (fC) 1uF 1kΩ R1 C2 C3 1 820pF 820pF C9 2 RL=47kΩ 1kΩR3 1uF 10 OUTR OUTL V Mute-Tr 9 V Mute-Tr V+ 10uF 3 V+ C11 4 CP 1uF Bias GND 8 V+ MUTE 7 Charge Pump C4 5 –6– Pop Noise Suppression CN C8 V- C6 6 10uF RL=47kΩ NJU72011 TEST CIRCUIT (VOS) 1uF 1 INL INR 1uF 10 C2 C8 2 OUTL V OUTR Mute-Tr 9 V Mute-Tr V+ 10uF 3 V+ 4 GND Pop Noise Suppression C11 CP V+ MUTE Bias 1uF 5 7 C7 Charge Pump C4 8 CN V- INL INR C6 10uF 6 TEST CIRCUIT (PSRR) Vripple=1kHz / 100mVrms 1uF 1 1uF 10 C2 C8 2 47kΩ OUTL V OUTR Mute-Tr 9 V Mute-Tr 47kΩ V+ 3 V+ Vripple C11 Pop Noise Suppression 10uF 4 CP 1uF Bias GND 8 V+ MUTE 7 Charge Pump C4 5 CN V- C6 10uF 6 –7– NJU72011 APPLICATION CIRCUIT 2 nd order LPF 1uF 1kΩ 1 INL INR 10 1kΩ 1uF 820pF 820pF 2 OUTR OUTL Mute-Tr 9 Mute-Tr V+ 10uF + 3 4 V+ CP 1uF Bias GND MUTE 8 7 CN 22kΩ 4.7uF Charge Pump 5 –8– Pop Noise Suppression V- 6 + 10uF NJU72011 APPLICATION NOTE The NJU72011 is an audio line amplifier that eliminates the need for external dc-blocking output capacitors. The NJU72011 has built-in pop suppression circuitry to eliminate disturbing pop noise during power-on, power-off and mute-control. 1. Operating Principle The NJU72011 has the built-in non-inverted input operational amplifiers, voltage inverter, and pop noise suppression circuitry (Fig.1). The voltage inverter for NJU72011 eliminates the need for external dc-blocking output capacitors. The pop suppression circuitry for NJU72011 eliminates the pop noise during power-on, power-off and mute-control. 1uF 1kΩ C2 R1 1 INL INR C3 820pF 1kΩ R31uF 10 820pF C9 2 OUTR OUTL Mute-Tr C8 9 Mute-Tr V+ 10uF 3 + V+ Pop Noise Suppression C11 4 CP 1uF Bias GND MUTE 8 Charge Pump C4 5 CN 22kΩ 7 C7 V- 6 4.7uF C6 R2 10uF + Fig.1 The NJU72011 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– NJU72011 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 NJU72011 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 NJU72011 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 400kΩ C7=4.7uF Fig.4 The NJU72011 block diagram (7pin) – 10 – NJU72011 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 200msec Vcnt MUTE MUTE MUTE t MUT (7pin) t Fig.5 Power-on / Power-off timing chart – 11 – NJU72011 TERMINAL DESCRIPTION Terminal SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE V+ 1 10 INL INR 18kΩ AC Input 0V 30pF 1kΩ 200kΩ V- GND VDD 2 9 OUTL OUTR 100Ω 200Ω 14.8kΩ AC Output 0V 1kΩ 7kΩ V- GND V+ 3 V+ Supply Voltage V+ V- V+ 4 CP Flying Capacitor Positive Terminal - V- – 12 – GND NJU72011 TERMINAL DESCRIPTION Terminal SYMBOL FUNCTION EQUIVALENT CIRCUIT VOLTAGE V+ 5 CN Flying Capacitor Negative Terminal - V- GND V+ 6 V- V- Voltage -[V+] V- V+ 7 MUTE 100Ω MUTE/Pop Noise Suppression 0V 400kΩ V- GND – 13 – NJU72011 TYPICAL CHARACTERISTICS Supply Current vs Supply Voltage No signal Maxim um Output Voltage vs Supply Voltage THD=1%, RL=47kohm, I/O: INL-OUTL 8 3.0 Maximum Output Voltage [Vrms] -40OC Supply Current [mA] 6 25OC 4 85OC 2 0 2.0 -40, 25, 85OC 1.5 1.0 0 1 2 3 4 2.5 3.0 3.5 4.0 Supply Voltage [V] Supply Voltage [V] Maxim um Output Voltage vs Frequency V +=3.3V, THD=1%, RL=47kohm, I/O: INL-OUTL Maxium Output Voltage vs Load Resistance V +=3.3V, f=1kHz ,I/O: INL-OUTL 3.0 Maximum Output Voltage [Vrms] 3.0 Maximum Output Voltage [Vrms] 2.5 25, 85OC 2.5 2.0 -40OC 1.5 1.0 10 10 100 1000 10000 2.5 25, 85OC 2.0 -40OC 1.5 1.0 1000 100000 10000 100000 Frequency [Hz] RL[Ω] Gain vs Frequency V +=3.3V, Vout=2Vrms, RL=47kohm, I/O: INL-OUTL 2nd Order LPF 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) 1 NJU72011 9 0.1 THD+N [%] Gain [dB] 8 NJU72010 7 6 100Hz 0.01 5 10kHz 4 1kHz 3 0.001 10 100 1000 10000 Frequency [Hz] – 14 – 100000 1000000 0.1 1 Output Voltage [Vrms] 10 NJU72011 TYPICAL CHARACTERISTICS THD+N vs Frequency V +=3.3V, RL=47kohm, Vout=2Vrms, I/O: INL-OUTL BW:10-80kHz 1 -40 85OC THD+N [%] 25OC -40OC Channel Separation[dB] -60 0.1 0.01 Channel Separation vs Frequency V *=3.3V, RL=47kohm, Vout=2Vrms, I/O:INL-OUTR Filter=Bandpass -80 -40OC -100 25, 85OC 0.001 -120 10 100 1000 10000 100000 10 100 Frequency [Hz] Frequency [Hz] Mute Control Voltage vs. Mute Level V +=3.3V, Vout=2Vrms, f=1kHz, Filter=Bandpass PSRR vs. Frequency V +=3.3V, Vripple=100mVrms, f=1kHz, Filter=Bandpass 20 -20 0 -30 -20 Mute Level [ dB ] 85OC -40 PSRR [ dB ] [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 1000 rights.10000 100000 the industrial -50 -40,25OC -60 85OC -40 -60 -80 -40,25OC -70 -100 -80 -120 10 100 1000 Frequency [ Hz ] 10000 100000 0 1 2 3 4 Mute Control Voltage [ V ] [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 –