NJM2768B HEADPHONE AMPLIFIER for CD-ROM GENERAL DESCRIPTION PACKAGE OUTLINE The NJM2768B is a headphone amplifier designed for CD- ROM. It includes 0dB closed loop gain and mute circuit, requires few external component. NJM2768BM NJM2768BRB1 The NJM2768B realizes very low turn-noise at mute mode. (DMP8) MSOP8(TVSP8) It is suitable for CD-ROM, and other general audio headphone amplifier application. FEATURES Operating Voltage 2.8 to 5.5V + Operating Current 2mA typ. at V =5V Fixed Gain 0dB typ. Stereo Headphone Output Internal Mute Circuit Bipolar Technology Package Outline DMP8 MSOP8(TVSP8)* *MEET JEDEC MO-187-DA / THIN TYPE PIN CONFIGURATION PIN FUNCTION 1.OUT1 1 8 2.MUTE 3.IN1 2 7 4.GND 5.IN2 6.BIAS 3 6 7.OUT2 + 8.V 4 5 BLOCK DIAGRAM 8 7 6 5 BIAS MUTE 1 2 3 4 -1-NJM2768B ABSOLUTE MAXIMUM RATINGS (Ta=25C) PARAMETER SYMBOL RATINGS UNIT + Supply Voltage V +7 V (DMP8) 375 Power Dissipation P 750 (note) mW D (MSOP8(TVSP8))320 Operating Temperature Range Topr -40 to +85 C Storage Temperature Range Tstg -50 to +150 C (note) At on PC board + ELECTRICAL CHARACTERISTICS (V =5.0V,Vin=0dBV,f=1kHz,R =32 ,Ta=25C unless otherwise specified) L PARAMETER SYMBOL TEST CONDITIONS MIN. TYP. MAX.UNIT + Operating Voltage V 2.8 5.0 5.5 V Operating Current I No Signal - 2.0 4.0 mA CC Reference Voltage Vref No Signal - 2.1 - V Closed Loop Gain G -1 0 1 dB V Channel Balance G -0.5 0 +0.5 dB V Output Power P 1 R =32 , THD=0.1% 30 50 - mW O L P 2 R =16 , THD=0.1% 40 100 - mW O L Total Harmonic Distortion THD - 0.02 0.1 % -104 -94 dBV Output Noise Voltage Vno Rg=0 , A-Weighted - (6.3) (20) ( Vrms) Mute Attenuation ATT Vo/Vin - -80 -70 dB Channel Separation CS 90 110 - dB Ripple Rejection Ratio RR Vripple=-20dBV, Rg=0 - 70 - dB + Input Voltage H-level V 2.0 - V V IH Input Voltage L-level V 0.0 - 0.3 V IL CONTROL PIN INFORMATION PARAMETER CONTROL SIGNAL OPERATING CONDITION MUTE ON L NON-SIGNAL MUTE OFF H OUTPUT SIGNAL -2-