NTE NTE712 Datasheet

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.

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