NTE1236 Integrated Circuit TV Sound IF System Description: The NTE1236 monolithic TV/FM sound system consists of a multistage limiting IF amplifier, DC gain control, FM detector, and an audio driver constructed on a single silicon chip. Excellent sensitivity, high AM rejection and an internally regulated power supply coupled with low external component requirements makes the NTE1236 suitable for a wide variety of applications including TV sound channels, FM radios and mobile communications equipment. Features: D Electronic Attenuator Replaces Conventional Volume Control D High Sensitvity D Low Harmonic Distortion D Excellent AM Rejection: (5−dB typ. at 4.5MHz) D Internal Zener Diode Regulated Supply D Differential Peak Detector Requires Only One Single−Turned Coil Absolute Maximum Ratings: (TA = +25°C, unless otherwise specified) Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±3V Input Current, ICC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30mA Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 625mW Operating Temperature Range, Topg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −20° to +75°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . −55° to +150°C Note *. Pin 5 may be connected to any positive voltage through a suitable dropping resistor, provided the dissipation rating is not exceeded. Note **. For temperatures above 25°C, derate linearly at 5.0mW/°C. Electrical Characteristics: (TA = +25°C, unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 10 16 24 mA Static Characteristics Supply Current ICC VCC = 9V Zener Regulating Characteristics VZ 10.3 11.2 12.2 V Internal Power Dissipation PD 330 345 360 mW fo = 4.5MHz, fM = 400Hz, ∆f = ±25kHz − 200 400 µV Dynamic Characteristics Input Limiting Voltage at −3dB VIN(lim) AM Rejection Ratio AMR f = 4.5MHz, FM: ∆f = ±25kHz, AM: 30% @ 45MHz 40 50 − dB Recovered AF Voltage VOD 0.5 0.75 − Vrms Total Harmonic Distortion THD f = 4.5MHz, VI = 0.1V, ∆f = ±25kHz, ±25kH fM = 400Hz 400H − 0.9 2.0 % − 17 − kΩ − 4 − pF − 3.25 − kΩ − 7.5 − pF − 7.5 − kΩ − 300 − Ω 60 80 − dB Input Impedance Parallel Resistance Parallel Capacitance Output Impedance Parallel Resistance Parallel Capacitance Output Impedance Pin 7 Rip Terminal No. 1−2 f = 4.5MHz Cip Rop Terminal No. 9−GND f = 4.5MHz Cop zo f = 400Hz Pin 8 Attenuation ATT Rx = ∞ AF Voltage Gain GV(ATF) VI = 0.1Vrms, f = 400Hz 17.5 20 − dB Total Harmonic Distortion THD(2) VO = 2Vrms, f = 400Hz − 1.5 − % Undistorted Output Voltage VO THD = 5%, f = 400Hz 2 2.5 − Vrms AF Input Resistance RI f = 400Hz − 70 − kΩ AF Output Resistance RO − 270 − Ω Pin Connection Diagram IF Input 1 14 AF Input IF Input 2 13 Tone Control GND 3 12 AF Output GND 4 11 N.C. VCC 5 10 IF Detector Tuning Volume Control 6 9 IF Detector Tuning De−Emphasis 7 8 AF Buffer Output 14 8 1 7 .785 (19.95) Max .300 (7.62) .200 (5.08) Max .100 (2.45) .600 (15.24) .099 (2.5) Min