NTE788 Integrated Circuit IF System for FM Receiver Description: The NTE788 is a monolithic integrated circuit in a 16–Lead DIP type package that provides all the functions of a comprehensive FM–IF system. This device features a three–stage FM–IF amplifier/limiter configuration with level detectors for each stage, a doubly–balanced quadrature FM detector, and an audio amplifier that features the optional use of a muting (squelch) circuit. The advanced circuit design of the IF system includes desirable deluxe features such as delayed AGC for the RF tuner, an AFC drive circuit, and an output signal to drive a tuning meter and/or provide stereo switching logic. In addition, internal power supply regulators maintain a nearly constant current drain over the voltage supply range of +8.5V to +16V. Features: D Exceptional limiting sensitivity: 12µV typ. at –3dB point D Low distortion: 0.1% typ. (with double–tuned coil) D Single–coil tuning capability D Improved S + N/N Radio D Externally programmable recovered audio level D Provides specific signal for control of interchannel muting (squelch) D On channel step for search control D Provides programmable AGC voltage for RF amplifier D Internal supply–voltage regulators D Externally programmable “ON” channel step width, and deviation at which muting occurs Absolute Maximum Ratings: (TA = +25°C unless otherwise specified) DC Supply Voltage Between Pin11 and Pin4 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V Between Pin11 and Pin14 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16V DC Current (Out of Pin15) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2mA Power Dissipation (Up to TA = 85°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 640mW Derate Above TA = +85°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.9mW/°C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C Lead Temperature (During Soldering, 1.32” from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265°C Electrical Characteristics: (TA = +25°C, V+ = 12V unless otherwise specified) Parameter Symbol Test Conditions Min Typ Max Unit 20 31 40 mA Static Characteristics Quiescent Circuit Current I11 DC Voltages IF Input V1 1.2 1.9 2.4 V AC Return to Input V2 1.2 1.9 2.4 V DC Bias to Input V3 1.2 1.9 2.4 V RF AGC V15 7.5 9.5 11.0 V DC Reference V10 5.0 5.6 6.0 V – 12 25 µV 45 55 – dB 300 400 500 mV – 0.5 1.0 % – 0.1 – % 60 67 – dB No Signal Input, Non Muted Dynamic Characteristics (fO = 10.7MHz, fmod = 400Hz, Deviation = ±75kHz) Input Limiting Voltage AM Rejection Recovered AF Voltage Total Harmonic Distortion Single Tuned V1 (lim) –3dB Point AMR VIN = 0.1V, AM Mod = 30% VO (AF) VIN = 0.1V THD VIN = 0.1V, Note 1 Double Tuned Signal Plus Signal–to–Noise Ratio VIN = 0.1V Note 1. THD characteristics are essentially a function of the phase characteristics of the network connected between Pin8, Pin9, and Pin10. Pin Connection Diagram IF Input 1 16 N.C. Decouple 2 15 AGC IF Bias 3 14 GND IF GND 4 13 Tuning Meter Mute Input 5 12 Mute Logic Audio Output 6 11 VCC AFC Output 7 10 Ref Bias IF Output 8 9 16 Quad Input 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)