NTE712
Integrated Circuit
TV/FM Sound IF Detector
Description:
The NTE712 is a versitile device in a 14Lead DIP type package incorporating IF limiting, detection,
electronic attenuation, audio amplifier, and audio driver capabilities.
Features:
D
Differential Peak Detector Requiring a Single Tuned Circuit
D
Electronic Attenuator Replaces Conventional AC Volume Control: Range > 60dB
D
Excellent AM Rejection @ 4.5 and 5.5MHz
D
High Stability
D
Low Harmonic Distortion
D
Audio Drive Capability: 6.0mA
PP
D
Minimum Undesirable Output Signal @ Maximum Attenuation
Absolute Maximum Ratings: (T
A
= +25
C unless otherwise specified)
Input Signal Voltage (Pin1 and Pin2)
3V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Supply Current
50mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation, P
D
625mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Derate Above 25
C
5mW/
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Ambient Temperature Range, T
opr
20
to +75
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Electrical Characteristics: (V+ = 24V, T
A
= +25C unless otherwise specified)
Parameter
Pin
Test Conditions
Min
Typ
Max
Unit
Regulated Voltage
5
10.3
11.0
12.2
V
DC Supply Current
5
V+ = 9V, R
S
= 0
10
16
24
mA
Quiescent Output Voltage
12
5.1
V
Dynamic Characteristics: (V+ = 24V, T
A
= +25
C unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
IF Amplifier and Detector (f
o
= 4.5MHz,
f =
25kHz)
AM Rejection
V
in
= 10mV
rms
, Note 1
40
51
dB
Input Limiting Threshold Voltage
200
400
V
rms
Recovered Audio Output Voltage
V
in
= 10mV
rms
0.5
0.7
V
rms
Output Distortion
V
in
= 10mV
rms
0.4
2.0
%
Note 1. 100% FM, 30% AM Modulation.
Dynamic Characteristics (Cont'd): (V+ = 24V, T
A
= +25
C unless otherwise specified)
Parameter
Test Conditions
Min
Typ
Max
Unit
IF Amplifier and Detector (f
o
= 5.5MHz,
f =
50kHz)
AM Rejection
V
in
= 10mV
rms
, Note 1
40
53
dB
Input Limiting Threshold Voltage
200
400
V
rms
Recovered Audio Output Voltage
V
in
= 10mV
rms
0.5
0.91
V
rms
Output Distortion
V
in
= 10mV
rms
0.9
%
Input Impedance Components
Parallel Input Resistance
f = 4.5MHz, measurement between Pin1 and Pin2
17
k
Parallel Input Capacitance
4
pF
Output Impedance Components
Parallel Output Resistance
f = 4.5MHz, measurement between Pin9 and GND
3.25
k
Parallel Output Capacitance
3.6
pF
Output Resistance
Pin7
7.5
k
Pin8
250
Attenuator
Volume Reduction Range
DC Volume Control =
60
dB
Maximum Undesirable Signal
DC Volume Control =
, Note 2
0.07
1.0
mV
Audio Amplifier
Voltage Gain
V
in
= 0.1V
rms
, f = 400Hz
17.5
20.0
dB
Total Harmonic Distortion
V
O
= 2V
rms
, f = 400Hz
2.0
%
Output Voltage
THD = 5%, f = 400Hz
2.0
3.0
V
rms
Input Resistance
f = 400Hz
70
k
Output Resistance
f = 400Hz
270
Note 1. 100% FM, 30% AM Modulation.
Note 2. Undesirable signal is measured at Pin8 when volume control is set for minimum output.
Pin Connection Diagram
V+
Tone Control
1
2
3
4
IF In Bias
IF In
GND
GND
5
6
DC Volume Control
7
DeEmphasis
14
13
12
11
Audio Input
Audio Output
N.C.
10
Quad Detector
9
Quad Detector
8
Detector Output
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