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| NTE742 Integrated Circuit TV Sound Channel, 2W Description: The NTE742 is designed for use as the entire sound function in television receivers or FM table radios. The NTE742 sound channel will directly drive a 16 ohm speaker with more than 2 watts output. This monolithic integrated circuit will operate from a single 18V to 28V power supply and can also function (with reduced power output) with supplies as low as 12V if additional decoupling is provided. The NTE742 is supplied in an improved 16-lead plastic dual in-line package with heat-sink contact tabs. A copper alloy lead frame allows maximum power dissipation with standard cooling methods. The unique lead configuration allows easy attachment of a heat sink and yet permits the use of a standard IC socket or printed wiring board layout. Features: D Low limiting Threshold D Low External Parts Count D Wide Operating Voltage Range D 70dB Limiter Gain D Automatic Thermal Shutdown D Output Current Limiting D Ripple Rejection Greater Than 20dB Absolute Maximum Ratings: Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +28V Regulator Output Current, IREG . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA Input Voltage (Pin 10), VIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +4.0V Operating Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, TS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Static Electrical Characteristics: (TA = +25C, VCC = 24V unless otherwise specified) Parameter Quiescent Supply Current Terminal Voltage Symbol ICC V2 V3 VOUT VREG VIN V14, V15 V16 VIN = 0 VIN = 0 Test Conditions Min 25 - - - 14 - - - Typ 45 10 2.6 12 15 1.4 4 8 Max 60 - - - 16 - - - Unit mA V V V V V V V Dynamic Electrical Characteristics: (TA = +25C, VCC = 24V, fo = 4.5MHz, fm = 400Hz, f = 25kHz, VIN = 10mV unless otherwise specified) Parameter Input Limiting Threshold AM Rejection Recovered Audio Total Harmonic Distortion Volume Control Voltage Symbol VTH AMR VOUT THD V1 Test Pin16 Test Pin6, POUT = 2W -3dB, Note 3 -20dB, Note 3 -40dB, Note 3 Playthrough Power Amp Voltage Gain Output Current Limiting Output Tracking Output Noise Power Amp Impedance Ae IOUT VOUT/VCC en Zin V1 = 0V VOUT = 1V RL = 0 VCC = 18V to 27V VIN = 0V, V1 = 10V f = 1kHz Test Conditions Note 1 Note 2 Min - 30 500 - - 6.0 2.0 0.75 - 25 - - - - Typ 150 > 50 700 <1 2.5 7.5 2.8 1.2 5 27 800 0.5 5 50 Max 400 - 900 3 10 10 4.0 1.8 25 29 - - 25 - Unit V dB mV % % V V V mV dB mA V/V mV k Note 1. Adjust V1 for VOUT = 2V, then reduce VIN until VOUT = 1.4V (-3dB). Note 2. Adjust V1 for VOUT = 2V. Note 3. Reference is VOUT at Pin 6 with V1 = 12V. Pin Connection Diagran DC Volume Control Detector Output Amplifier Input GND Audio Output VCC Regulator Output 1 2 3 F i n 6 7 8 16 De-Emphasis 15 Phase Shift 14 Phase Shift F i n GND 11 IF Decoupling 10 IF Input 9 Low-Level GND .202 (5.12) 16 1 9 8 .770 (19.5) Max .254 (6.45) .168 (4.26) Max .100 (2.54) .700 (17.78) .141 (3.6) .138 (3.5) .300 (7.62) |
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