NTE1477 Integrated Circuit 2 Channel Amplifier for Headphone Use Description: The NTE1477 is a integrated circuit in a 14–Lead DIP type package suitable for use as a headphone driving amplifier in the output amplifier of a tape deck or a tuner. Features: D Wide Operating Voltage Range D Small Pop Noise by Means of Emitter Feedback D Dual Amplifier Involved–Few Peripheral Parts D Small Output Noise Voltage Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) Maximum Supply Voltage, VCCmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22V Maximum Supply Current (only Pin2: flow–in; Pin7, 8: flow–out), ICP . . . . . . . . . . . . . . . . . . . . . 0.5A Allowable Power Dissipation, PDmax . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.05W Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C Recommended Operating Condition: (TA = 25°±C) Recommended Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14V Load Resistance, RL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8Ω or 200Ω Operating Characteristics: (TA = +25°C, VCC = 14V, RL = 8Ω f = 1kHz, Rg = 600Ω unless otherwise specified) Parameter Quiescent Current Symbol Test Conditions ICCO Voltage Gain VG VO = 77.5mV Output Voltage VO THD = 10% Total Harmonic Distortion Input Resistance Output Noise Voltage Channel Separation Gain Difference Min Typ Max Unit 6 8 15 mA 7 9 11 dB 0.58 0.68 – V THD VO = 0.1V – 0.5 1.0 % ri VO = 0.2V 20k 30k 40k Ω – 6 18 µV –50 –68 – dB – – 1 dB VNO Rg = 1kΩ, filter: 15 to 30kHz Rg = 1kΩ Pin Connection Diagram Tab N.C. 1 14 N.C. VCC 2 Bias 3 13 Bypass 12 Bias Rt Ch Input 4 11 Lt Ch Input 10 Bypass Bypass 5 Rt Ch Output 6 9 Lt Ch Output N.C. 7 .099 (2.52) 14 8 GND 8 .252 (6.45) 1 .082 (2.1) Dia .265 (6.5) 7 .748 (19.0) .300 (7.62) .167 (4.26) .100 (2.54) .236 (6.0) .137 (3.5)