NTE787
Integrated Circuit
AM Receiver Subsystem
For Applications in a variety of AM broadcast and communications receivers and applications
requiring an array of amplifiers.
Description:
The NTE787, a monolithic integrated circuit, is an AM subsystem that provides the converter, IF ampli-
fier, detector, and audio preamplifier stages for an AM receiver. It also provides internal AGC for the
first IF amplifier stage, delayed AGC for an optional external RF amplifier, a buffer stage to drive a
tuning meter, and terminals facilitating the optional use of a tone control.
This device features four independent transistor amplifiers, each incorporating internal biasing for
temperature tracking. These amplifiers are particularly useful in generalpurpose amplifier, oscillator,
and detector applications in a wide variety of equipment designs.
The NTE787 utilizes a 16Lead DIP package and operates over an ambient temperature range of
40
to +85
C.
Features:
D
Excellent overload characteristics
D
AGC for IF amplifier
D
Buffered output signal for tuning meter
D
Internal Zener diode provides voltage regulation
D
Two IF amplifiers stages
D
Lownoise converter and first IF amplifier
D
Low harmonic distortion (THD)
D
Delayed AGC for RF amplifier
D
Terminals for optional inclusion of tone control
D
Operates from wide range of power supplies: V+ = 6 to 16 volts
D
Optional AC and/or DC feedback on wideband amplifier
D
Array of amplifiers for generalpurpose applications
D
Suitable for use with optional external RF stage, either MOS or bipolar
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
DC Supply Voltage (Across Pin5 and Pin3, Pin6, Pin13, Pin16 respectively)
16V
. . . . . . . . . . . . . . .
DC Current
At Pin3, Pin6, Pin13, Pin16 respectively
10mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
At Pin10
30mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Device Dissipation (Up to T
A
= +50
C), P
D
760mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above T
A
= +50
C
7.6mW/
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
DC Voltage
Pin1, Pin4, Pin9, Pin11
V
1
, V
4
, V
9
, V
11
0.7
V
Pin2, Pin7, Pin8
V
2
, V
7
, V
8
1.4
V
Pin10
V
10
5.6
V
Pin12
V
12
0
V
Pin15
V
15
3.5
V
DC Current
Pin3
I
3
0.35
mA
Pin6
I
6
1.0
mA
Pin10
I
10
20
mA
Pin13
I
13
0
mA
Pin16
I
16
1.2
mA
Dynamic Characteristics
Detector Output
30% Modulation
75
mV
rms
Audio Amplifier Gain
A
AF
f = 1kHz
30
dB
Audio Distortion
V
OUT
= 100mV
0.2
%
Sensitivity
At Converter Stage Input
f
IN
= 1MHz,
200
V/m
At RF Stage Input
SignaltoNoise Ratio (S/N) = 20dB
100
V/m
Total Harmonic Distortion
THD
30% Modulation
1.0
%
Input Resistance
At Transistor Q1
R
IN
No AGC,
3500
At Transistor Q5
Input Frequency Signal (f
IN
) = 1MHz
2000
Input Capacitance
At Transistor Q1
C
IN
17
pF
At Transistor Q5
12
pF
Feedback Capacitance
At Transistor Q1
C
FB
1.5
pF
At Transistor Q5
1.5
pF
PDF 
ZIP