NTE1231 & NTE1231A Integrated Circuit Complete 4 Watt TV Sound Channel Description: Capable of carrying out all of the functions of a TV sound channel, the NTE1231 and NTE1231A silicon monolithic integrated circuits consist of a six–stage IF amplifier/limiter, low–pass filter, differential peak detector, DC volume control, regulated power supply, audio preamplifier, and output stage. The audio power amplifier will deliver 4W of low–distortion audio to a 16Ω load with a supply of 24V. When used with a 12V supply, such as is found in many portable TV sets, these devices will furnish 1.5W to an 8Ω loud speaker. The NTE1231 is supplied in a quad in–line plastic package with a copper lead frame. This device is designed to use the printed wiring board on which it is mounted for heat dissipation. The NTE1231A is furnished in a 16–Lead DIP package with heat–sink contact tabs. The webbed lead configuration (Pin4 & Pin5, Pin12 & Pin13) allows an inexpensive heat sink to be easily attached for increased power dissipation capability and yet permits the use of a standard IC socket or printed wiring board hole layout. Features: D High Sensitivity D High AM Rejection D DC Volume Control D High Power Output D Low Distortion D Wide Operating Voltage Range: 9V to 28V D Low Quiescent Current Drain Absolute Maximum Ratings: Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28V Repetitive Peak Output Current, IOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1.5A Power Dissipation, PD Tpins = +90°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4.3W TA = +70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1W Junction Temperature Range, TJ . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +150°C Electrical Characteristics: (TA = +25°C, fo = 4.5MHz, fm = 400Hz, fd = ±7.5kHz, VCC = 12V, RL = 8Ω, Vin = 1mV unless otherwise specified) Parameter Symbol Test Conditions Typ Max Unit 5.1 6.0 6.9 V Quiesecnt Output Voltage VOUT Quiescent Supply Current ICC RX = 22kΩ, Vin = 0 – 19 33 mA Input Limiting Threshold VTH RX = 0 – 40 100 µV AM Rejection AMR fd = ±25kHz, m = 0.3 40 55 – dB POUT = 0.5W, fd = ±25kHz 50 65 – dB Signal–to–Noise Ratio S + N/N Vin = 0 Min Recovered Audio Vout RX = 0 – 120 – mV Output Distortion THD POUT = 50mW – 1.0 – % Output Power POUT THD = 2%, fd = ±25kHz – 1.4 – W THD = 10%, fd = ±25kHz – 1.5 – W f = 120Hz, RX = 22kΩ, RL = 4Ω – 46 – dB Power Supply Rejection PSR Input Resistance Rin – 30 – kΩ Input Capacitance Cin – 5 – pF Electrical Characteristics: (TA = +25°C, fo = 4.5MHz, fm = 400Hz, fd = ±7.5kHz, VCC = 24V, RL = 16Ω, Vin = 1mV unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit Vin = 0 11 12 13 V Quiesecnt Output Voltage VOUT Quiescent Supply Current ICC RX = 22kΩ, Vin = 0 11 22 35 mA Input Limiting Threshold VTH RX = 0 – 40 100 µV AM Rejection AMR fd = ±25kHz, m = 0.3 40 55 – dB POUT = 1W, fd = ±25kHz 50 65 – dB Signal–to–Noise Ratio S + N/N Recovered Audio Vout RX = 0 – 120 – mV Output Distortion THD POUT = 50mW – 0.75 – % Output Power POUT THD = 2%, fd = ±25kHz – 3.5 – W THD = 10%, fd = ±25kHz – 4.2 – W f = 120Hz, RX = 22kΩ, RL = 4Ω – 46 – dB Power Supply Rejection PSR Input Resistance Rin – 30 – kΩ Input Capacitance Cin – 5 – pF Pin Connection Diagram IF Input 1 12 DE–Emphasis IF Decoupling 2 IF Decoupling 3 IF Input 1 16 DE–Emphasis 11 Ripple Rejection IF Decoupling 2 15 Ripple Rejection 10 VCC IF Decoupling 3 14 VCC GND 4 NTE1231 GND 5 13 GND NTE1231A 12 GND FM Detector 4 9 AF Output FM Detector 6 11 AF Output FM Detector 5 8 Compensation FM Detector 7 10 Compensation DC Volume Control 6 7 AF Feedback DC Volume Control 8 9 NTE1231 .247 (6.27) 12 7 1 6 .677 (17.2) .770 (19.5) Max .260 (6.6) .233 (5.9) Max .100 (2.54) .099 (2.5) Min .700 (17.78) NTE1231A 16 9 .260 (6.6) Max 1 8 .785 (19.9) Max .300 (7.62) .200 (5.08) Max .245 (6.22) Min .100 (2.54) .700 (17.7) AF Feedback