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| NJM2772 LOW-VOLTAGE HEADPHONE AMPLIFIER for PORTABLE-AUDIO s GENERAL DESCRIPTION The NJM2772 is a low voltage headphone amplifier for portable audio. The NJM2772 includes mute circuit, center amplifier and beep input, reduce the external parts, standby circuit and center amplifier with ON/OFF, applies to low current consumption. The mute function reduces the turn-noise at standby mode. The NJM2772 is suitable for portable MD, CD, and others portable audio system with headphone amplifier. s FEATURES q Operating Voltage q Operating Current q Low Standby Current q High Output Power q Fixed Gain q Package Outline q Bipolar Technology s PACKAGE OUTLINE NJM2772V V+=1.8-4.5V 1.2mA typ. @Center Amp. Off 2.0mA typ. @Center Amp. On 18A typ. 6mWmin. @RL=16, THD=10% 11.5dB typ. SSOP14 s PIN CONFIGURATION & BLOCK DIAGRAM STBY 1 INA 2 CenterSW 3 Vref 4 BEEP 5 INB 6 MUTE 7 + PA-B 14 DNC + PA-A 13 OUTA 12 V+ Vref PA-C 11 OUTC 10 GND 9 OUTB 8 MuteTC Pin Function 1.STBY 2.INA 3.CenterSW 4.VREF 5. BEEP 6.INB 7.MUTE 8.MuteTC 9.OUTB 10.GND 11.OUTC 12. V+ 13.OUTA 14.DNC Note)DNC(14pin):Do not connect -1- NJM2772 s ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range V PD Topr Tstg + RATINGS 5 (SSOP14) 300 -20 to +75 -40 to +125 (Ta=25C) UNIT V mW C C s RECOMMENDED OPERATING CONDITIIONS PARAMETER SYMBOL MIN. TYP. Operating Voltage Range V+ 1.8 2.3 (Ta=25C) MAX. UNIT 4.5 V s ELECTRICAL CHARACTERISTICS (V+=2.3V,Rg=600,RL=16,f=1kHz,STBY-OFF,MUTE-OFF,CA-ON,Ta=25C) PARAMETER SYMBOL ICC1 ICC2 ICC3 Operating Current ICC4 ICC5 Icc6 ICC7 VREF GV PO1 PO2 VNO CT MUTE VBEEP SVR TEST CONDITION STANDBY-ON,MUTE-ON No signal, CA-OFF No signal PO=0.5mW+0.5mW,CA-OFF PO=0.5mW+0.5mW PO=0.1mW+0.1mW,CA-OFF PO=0.1mW+0.1mW No signal VIN=-30dBV THD=10% V+1=1.8V,THD=10% VIN=-30dBV A-Weighted VIN=-30dBV,Vo=-18.5dBV MUTE-ON,VIN=-30dBV,A-Weighted BEEP-IN=2Vpp V+=1.8V+0.1Vrms:1kHz MIN. 0.70 10.5 6.0 3.0 -55 65 TYP. 18 1.2 2.0 5.8 11.7 3.0 5.9 0.75 11.5 8.0 4.0 0.1 -98 (12.6) -40 -95 -50 70 MAX. 26 2.0 4.0 0.80 12.5 0.5 -94 (20) -24 -80 -45 UNIT A mA mA mA mA mA mA V dB mW % dBV (Vrms) dB dBV dBV dB Reference Voltage Voltage Gain Output Power Total Harmonic Distortion THD Output Noise Voltage Closs-talk Mute Level Beep Output Voltage Supply Voltage Rejection Ratio s CONTROL TERMINAL CHARACTERISTICS PARAMETER SYMBOL TEST CONDITION H Level Input Voltage VIH STBY(1Pin),CSW(3Pin),MUTE(7Pin) L Level Input Voltage VIL STBY(1Pin),CSW(3Pin),MUTE(7Pin) H Level Input Voltage VBH BEEP(5Pin) L Level Input Voltage VBL BEEP(5Pin) MIN. 0.8 0 0.8 0 TYP. - MAX. V+ 0.3 V+ 0.3 UNIT V V V V -2- NJM2772 s CONTROL TERMINAL EXPLANTION STBY (1Pin) CONTROL PARAMETER SIGNAL STANDBY ON L IC is standby. STANDBY OFF H IC is active. Center-SW (3Pin) PARAMETER Center Amp. ON Center Amp. OFF MUTE (7Pin) PARAMETER MUTE ON MUTE OFF CONTROL SIGNAL H IC output no signal. L IC output the signal. STATUS CONTROL SIGNAL L H STATUS Center Amp. is active. Can operate output coupling capacitor less. When output coupling capacitor is used, realize low current consumption to be Center Amp. OFF. STATUS s APPLICATION CIRCUIT 1) Center Amp. On Mode STBY OFF STBY ON STBY 0.47uF 1 2 + PA-A 14 DNC 13 16 INA Center OFF Center ON OUTA V+ CenterSW 3 4 5 Vref PA-C 12 0.1uF 47uF Vref BEEP 0.47uF 11 OUTC GND 10 16 INB MUTE ON MUTE OFF 6 MUTE 7 + PA-B 9 0.47uF OUTB MuteTC 8 -3- NJM2772 s APPLICATION CIRCUIT 2) Center Amp. Off Mode STBY OFF STBY ON STBY 0.47uF 1 2 + PA-A 14 DNC 13 12 0.1uF INA Center OFF Center ON 16 OUTA V+ CenterSW 3 4 5 Vref PA-C 47uF Vref BEEP 0.47uF 11 10 GND OUTB 16 INB MUTE ON MUTE OFF 6 MUTE 7 + PA-B 9 8 MuteTC 0.47uF Note) When the BEEP terminal (5pin) is useless, short to GND. [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. -4- |
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