NJM2772 LOW-VOLTAGE HEADPHONE AMPLIFIER for PORTABLE-AUDIO ■ 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. ■ FEATURES ● Operating Voltage ● Operating Current ■ PACKAGE OUTLINE NJM2772V V+=1.8-4.5V 1.2mA typ. @Center Amp. Off 2.0mA typ. @Center Amp. On 18µA typ. 6mWmin. @RL=16Ω, THD=10% 11.5dB typ. SSOP14 ● Low Standby Current ● High Output Power ● Fixed Gain ● Package Outline ● Bipolar Technology ■ PIN CONFIGURATION & BLOCK DIAGRAM STBY 1 14 DNC + INA 2 PA-A 12 V+ CenterSW 3 Vref 4 Vref PA-C BEEP 5 INB 6 MUTE 7 13 OUTA 11 OUTC 10 GND + PA-B 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 ■ ABSOLUTE MAXIMUM RATINGS PARAMETER SYMBOL Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range RATINGS + V PD Topr Tstg (Ta=25°C) UNIT 5 (SSOP14) 300 -20 to +75 -40 to +125 ■ RECOMMENDED OPERATING CONDITIIONS PARAMETER SYMBOL MIN. TYP. Operating Voltage Range V+ 1.8 2.3 V mW °C °C (Ta=25°C) MAX. UNIT 4.5 V ■ ELECTRICAL CHARACTERISTICS (V+=2.3V,Rg=600Ω,RL=16Ω,f=1kHz,STBY-OFF,MUTE-OFF,CA-ON,Ta=25°C) PARAMETER SYMBOL TEST CONDITION MIN. TYP. MAX. UNIT ICC1 ICC2 ICC3 STANDBY-ON,MUTE-ON No signal, CA-OFF No signal - 18 1.2 2.0 26 2.0 4.0 µA mA mA Operating Current ICC4 ICC5 Icc6 ICC7 PO=0.5mW+0.5mW,CA-OFF PO=0.5mW+0.5mW PO=0.1mW+0.1mW,CA-OFF PO=0.1mW+0.1mW - 5.8 11.7 3.0 5.9 - mA mA mA mA Reference Voltage Voltage Gain VREF GV PO1 PO2 No signal VIN=-30dBV THD=10% V+1=1.8V,THD=10% 0.70 10.5 6.0 3.0 0.75 11.5 8.0 4.0 0.80 12.5 - V dB 0.5 -94 (20) -24 -80 -45 % dBV (µVrms) dB dBV dBV - dB MAX. V+ 0.3 V+ 0.3 UNIT V V V V Output Power Total Harmonic Distortion THD VIN=-30dBV - Output Noise Voltage VNO A-Weighted - Closs-talk Mute Level Beep Output Voltage Supply Voltage Rejection Ratio CT MUTE VBEEP VIN=-30dBV,Vo=-18.5dBV MUTE-ON,VIN=-30dBV,A-Weighted BEEP-IN=2Vpp -55 0.1 -98 (12.6) -40 -95 -50 SVR V+=1.8V+0.1Vrms:1kHz 65 70 ■ 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) -2- MIN. 0.8 0 0.8 0 TYP. - mW NJM2772 ■ CONTROL TERMINAL EXPLANTION ♦STBY (1Pin) CONTROL PARAMETER SIGNAL STANDBY ON L IC is standby. STANDBY OFF H IC is active. STATUS ♦Center-SW (3Pin) CONTROL SIGNAL PARAMETER Center Amp. ON L Center Amp. OFF 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. ♦MUTE (7Pin) CONTROL SIGNAL H IC output no signal. L IC output the signal. PARAMETER MUTE ON MUTE OFF STATUS ■ APPLICATION CIRCUIT 1) Center Amp. On Mode STBY OFF STBY STBY ON 1 14 DNC 0.47uF + 2 INA PA-A 13 OUTA 16Ω Center OFF CenterSW Center ON V+ 12 3 0.1uF 47uF Vref 4 BEEP Vref PA-C 5 11 OUTC GND 10 16Ω 0.47uF 6 INB MUTE ON MUTE OFF MUTE + PA-B OUTB 9 0.47uF 7 8 MuteTC -3- NJM2772 ■ APPLICATION CIRCUIT 2) Center Amp. Off Mode STBY OFF STBY STBY ON 1 14 DNC 0.47uF INA Center OFF + 2 CenterSW Center ON PA-A 3 13 16Ω OUTA V+ 12 0.1uF 47uF Vref 4 BEEP Vref PA-C 5 11 10 GND 0.47uF 6 INB MUTE ON MUTE OFF MUTE + PA-B 7 OUTB 9 8 16Ω 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-