NTE788
Integrated Circuit
IF System for FM Receiver
Description:
The NTE788 is a monolithic integrated circuit in a 16Lead DIP type package that provides all the
functions of a comprehensive FMIF system. This device features a threestage FMIF amplifier/lim-
iter configuration with level detectors for each stage, a doublybalanced 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 doubletuned coil)
D
Singlecoil 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 supplyvoltage regulators
D
Externally programmable "ON" channel step width, and deviation at which muting occurs
Absolute Maximum Ratings: (T
A
= +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 T
A
= 85
C), P
D
640mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above T
A
= +85
C
9.9mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Ambient Temperature Range, T
opr
40
to +85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering, 1.32" from case, 10sec max), T
L
+265
C
. . . . . . . . . . . . . . . . .
Electrical Characteristics: (T
A
= +25
C, V
+
= 12V unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Static Characteristics
Quiescent Circuit Current
I
11
No Signal Input, Non Muted
20
31
40
mA
DC Voltages
IF Input
V
1
1.2
1.9
2.4
V
AC Return to Input
V
2
1.2
1.9
2.4
V
DC Bias to Input
V
3
1.2
1.9
2.4
V
RF AGC
V
15
7.5
9.5
11.0
V
DC Reference
V
10
5.0
5.6
6.0
V
Dynamic Characteristics (f
O
= 10.7MHz, f
mod
= 400Hz, Deviation =
75kHz)
Input Limiting Voltage
V
1
(lim) 3dB Point
12
25
V
AM Rejection
AMR
V
IN
= 0.1V, AM Mod = 30%
45
55
dB
Recovered AF Voltage
V
O
(AF) V
IN
= 0.1V
300
400
500
mV
Total Harmonic Distortion
Single Tuned
THD
V
IN
= 0.1V, Note 1
0.5
1.0
%
Double Tuned
0.1
%
Signal Plus SignaltoNoise Ratio
V
IN
= 0.1V
60
67
dB
Note 1. THD characteristics are essentially a function of the phase characteristics of the network
connected between Pin8, Pin9, and Pin10.
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