j NJM2768 HAEDPHONE AMPLIFIER for CD-ROM ■ GENERAL DESCRPTION ■ PACKAGE OUTLENE The NJM2768 is a headphone amplifier designed for CDROM. It includes 0dB closed loop gain and mute circuit which require few external component. The NJM2768 realizes very low turn-noise at mute mode. It is suitable for CD-ROM , and other general audio headphone amplifier application. NJM2768M ■ FEATURES ●Operating Voltage ●Operating Current ●Fixed Gain ●Stereo Headphone Output ●Internal Mute Circuit ●Bipolar Technology ●Package Outline 4.5-5.5V + 2mA typ., at V =5V 0dB typ. DMP8 ■ PIN CONFIGURATION 1 8 2 7 3 6 4 5 PIN FUNCTION 1.OUT1 2.MUTE 3.IN1 4.GND 5.IN2 6.BIAS 7.OUT2 + 8.V ■ BLOCK DIAGRAM 8 6 7 5 BIAS MUTE 1 2 3 4 j NJM2768 ■ ABSOLUTE MAXMUM RANGE (Ta=25°C) PARAMETER SYMBOL + Supply Voltage V Power Dissipation PD RATINGS UNIT V mW °C Operating Temperature Range Topr +7 (DMP8) 375 750 (note) -40 to +85 Storage Temperature Range Tstg -50 to +150 °C (note)At on PC board ■ ELECTRICAL CHARACTERISTICS (V+=5.0V,Vin=0dBV,f=1kHz,RL=32Ω,Ta=25°C unless otherwise specified) PARAMETER SYMBOL TEST CONDITIONS + MIN. TYP. MAX. UNIT 4.5 5.0 5.5 V Operating Voltage V Operating Current ICC No Signal - 2.0 4.0 mA Reference Voltage Vref No Signal - 2.1 - V Closed Loop Gain GV -1 0 1 dB Channel Balance ∆GV -0.5 0 +0.5 dB Output Power PO1 RL=32Ω, THD=1% 30 50 - mW PO2 RL=16Ω, THD=1% 40 100 - mW - 0.02 0.1 % dBV -94 (20) (µVrms) Total Harmonic Distortion THD Output Noise Voltage Vno Rg=0Ω, A-Weighted - -104 (6.3) Mute Attenuation ATT Vo/Vin - -80 -70 dB Channel Separation CS 90 110 - dB Ripple Rejection Ratio RR - 70 - dB Input Voltage H-level VIH 2.0 - V + V Input Voltage L-level VIL 0.0 - 0.3 V Vripple=-20dBV, Rg=0Ω ■ COMTROL PIN INFOMETION PARAMETER CONTROL SIGNAL OPERATING CONDITION MUTE ON L NON-SIGNAL MUTE OFF H OUTPUT SIGNAL j NJM2768 ■ TYPICAL APPLICATION 100uF 47uF BIAS 6 OUT2 + V 8 7 16Ω Ω /32Ω Ω SPEAKER IN2 5 + V BIAS 2 100uF 1 16Ω Ω /32Ω Ω SPEAKER mute 1 OUT1 2 MUTE MUTE H:SPEAKER Active L: SPEAKER Mute 100kΩ Ω 3 IN1 4 GND 1 F 1uF NJM2768 MEMO [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.