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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: 12V 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 = +25C 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 = 85C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 640mW Derate Above TA = +85C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.9mW/C Operating Ambient Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40 to +85C Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -65 to +150C Lead Temperature (During Soldering, 1.32" from case, 10sec max), TL . . . . . . . . . . . . . . . . . +265C
Electrical Characteristics: (TA = +25C, V+ = 12V unless otherwise specified)
Parameter Static Characteristics Quiescent Circuit Current DC Voltages IF Input AC Return to Input DC Bias to Input RF AGC DC Reference Input Limiting Voltage AM Rejection Recovered AF Voltage Total Harmonic Distortion Single Tuned Double Tuned Signal Plus Signal-to-Noise Ratio VIN = 0.1V I11 V1 V2 V3 V15 V10 V1 (lim) -3dB Point AMR VIN = 0.1V, AM Mod = 30% VO (AF) VIN = 0.1V THD VIN = 0.1V, Note 1 No Signal Input, Non Muted 20 1.2 1.2 1.2 7.5 5.0 - 45 300 - - 60 31 1.9 1.9 1.9 9.5 5.6 12 55 400 0.5 0.1 67 40 2.4 2.4 2.4 11.0 6.0 25 - 500 1.0 - - mA V V V V V V dB mV % % dB Symbol Test Conditions Min Typ Max Unit
Dynamic Characteristics (fO = 10.7MHz, fmod = 400Hz, Deviation = 75kHz)
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 Decouple IF Bias IF GND Mute Input Audio Output AFC Output IF Output
1 2 3 4 5 6 7 8
16 N.C. 15 AGC 14 GND 13 Tuning Meter 12 Mute Logic 11 VCC 10 Ref Bias 9 Quad Input
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)

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