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NTE712
Integrated Circuit
TV/FM Sound IF Detector
Description:
The NTE712 is a versitile device in a 14–Lead 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
D Minimum Undesirable Output Signal @ Maximum Attenuation
P–P
Absolute Maximum Ratings:
(TA = +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
Storage Temperature Range, T
Electrical Characteristics:
Parameter Pin Test Conditions Min Typ Max Unit
Regulated Voltage 5 10.3 11.0 12.2 V
DC Supply Current 5 V+ = 9V, RS = 0 10 16 24 mA
Quiescent Output Voltage 12 5.1 – – V
stg
(V+ = 24V, TA = +25C unless otherwise specified)
opr
–20° to +75°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–65° to +150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Dynamic Characteristics: (V+ = 24V, TA = +25°C unless otherwise specified)
Parameter Test Conditions Min Typ Max Unit
IF Amplifier and Detector (fo = 4.5MHz, ∆f = ±25kHz)
AM Rejection Vin = 10mV
Input Limiting Threshold Voltage – 200 400 µV
Recovered Audio Output Voltage Vin = 10mV
Output Distortion Vin = 10mV
, Note 1 40 51 – dB
rms
rms
rms
0.5 0.7 – V
– 0.4 2.0 %
rms
rms
Note 1. 100% FM, 30% AM Modulation.
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Dynamic Characteristics (Cont’d): (V+ = 24V, TA = +25°C unless otherwise specified)
Parameter Test Conditions Min Typ Max Unit
IF Amplifier and Detector (fo = 5.5MHz, ∆f = ±50kHz)
AM Rejection Vin = 10mV
Input Limiting Threshold Voltage – 200 400 µV
Recovered Audio Output Voltage Vin = 10mV
Output Distortion Vin = 10mV
Input Impedance Components
Parallel Input Resistance
Parallel Input Capacitance – 4 – pF
Output Impedance Components
Parallel Output Resistance
Parallel Output Capacitance – 3.6 – pF
Output Resistance
Pin7
Pin8 – 250 – Ω
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 Vin = 0.1V
Total Harmonic Distortion VO = 2V
Output Voltage THD = 5%, f = 400Hz 2.0 3.0 – V
Input Resistance f = 400Hz – 70 – kΩ
f = 4.5MHz, measurement between Pin1 and Pin2
f = 4.5MHz, measurement between Pin9 and GND
, Note 1 40 53 – dB
rms
rms
rms
, f = 400Hz 17.5 20.0 – dB
rms
, f = 400Hz – 2.0 – %
rms
0.5 0.91 – V
– 0.9 – %
– 17 – kΩ
– 3.25 – kΩ
– 7.5 – kΩ
rms
rms
rms
Output Resistance f = 400Hz – 270 – Ω
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
IF In Bias
IF In
GND
GND
V+
1
2
3
4
5
6DC Volume Control
7De–Emphasis
Audio Input
14
13
Tone Control
12
Audio Output
N.C.
11
10 Quad Detector
9 Quad Detector
8 Detector Output
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14 8
17
.785 (19.95) Max
.200 (5.08)
Max
.100 (2.45) .099 (2.5) Min
.600 (15.24)
.300 (7.62)
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