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/lim-
iter 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 ste-
reo 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: 12 V 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: (T
DC Supply Voltage
DC Current (Out of Pin15)
Power Dissipation (Up to T
Operating Ambient Temperature Range, T
Storage Temperature Range, T
Lead Temperature (During Soldering, 1.32” from case, 10sec max), T
Between Pin11 and Pin4
Between Pin11 and Pin14
Derate Above T
A
= +85 C
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
= 85 C), P
IF System for FM Receiver
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
= +25 C unless otherwise specified)
Integrated Circuit
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
opr
NTE788
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
L
. . . . . . . . . . . . . . . . .
–65 to +150 C
–40 to +85 C
9.9mW/ C
640mW
+265 C
2mA
16V
16V