NTE788
Integrated Circuit
IF System for FM Receiver
Description:
The NTE788 is a monolithic integrated circuit in a 16鈥揕ead DIP type package that provides all the
functions of a comprehensive FM鈥揑F system. This device features a three鈥搒tage FM鈥揑F amplifier/lim-
iter configuration with level detectors for each stage, a doubly鈥揵alanced 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碌V typ. at 鈥?dB point
D
Low distortion: 0.1% typ. (with double鈥搕uned coil)
D
Single鈥揷oil 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鈥搗oltage regulators
D
Externally programmable 鈥淥N鈥?channel step width, and deviation at which muting occurs
Absolute Maximum Ratings:
(T
A
= +25擄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 T
A
= 85擄C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 640mW
Derate Above T
A
= +85擄C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9.9mW/擄C
Operating Ambient Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +85擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
Lead Temperature (During Soldering, 1.32鈥?from case, 10sec max), T
L
. . . . . . . . . . . . . . . . . +265擄C
1
2
3
