NTE745 Integrated Circuit Audio Amplifier, 500mW Description: the NTE745 is a monolithic complementary power amplifier and preamplifier designed to deliver 1/2–Watt into a loudspeaker with a 3.0mV(rms) typical input. Gain and bandwidth are externally adjustable. Typical applications include portable AM–FM radios, tape recorders, phonographs, and intercoms. Features: D 1/2–Watt Power Output (9.0 Vdc Supply, 8–Ohm Load) D High Overall Gain–3.0mV(rms) Sensitivity for 1/2–Watt Output D Low Zero–Signal Current Drain–4.0mAdc @ 9.0V typ D Low Distortion–0.5% at 250mW typ Electrical Characteristics: (V+ = 9V, RL = 8Ω, f = 1kHz, TA = +25°C unless otherwise specified) Parameter Open Loop Voltage Gain Symbol AVOL Test Conditions Min Typ Max Unit Pre–Amplifier, RL = 1.0kΩ – 270 – V/V Power–Amplifier, RL = 16Ω – 360 – V/V PO = 500mW – 3.0 – mV(rms) – 0.5 – W Sensitivity S Output Impedance (Power–Amplifier) ZO Signal to Noise Ratio S/N PO = 150mW, f = 300Hz to 10kHz – 55 – dB Total Harmonic Distortion THD PO = 250mW – 0.5 – % Quiescent Output Voltage VO – V+/2 – Vdc Output Power PO THD ≤ 10% 500 570 – mW Current Drain ID Zero Signal – 4.0 – mA Power Dissipation PD Zero Signal – 36 – mW Pin Connection Diagram GND 1 8 Power Amp Input N.C. 2 Power Amp Output 3 7 GND 6 Pre–Amp Input VCC 4 5 Pre–Amp Input 8 5 .260 (6.6) 1 4 .300 (7.62) .390 (9.9) Max .155 (3.93) .100 (2.54) .145 (3.68) .300 (7.62)