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NTE709
Integrated Circuit
TV/FM Sound IF Amplifier
Description:
The NTE709 is a monolithic integrated circuit in a 14–Lead DIP type package providing a multi–stage
wideband amplifier/limiter, an FM quadrature detector, and an emitter–follower audio output stage
and is designed for use in FM receivers or in sound IF of TV receivers.
Features:
D Good Sensitivity
D Excellent AM Rejection
D Low Harmonic Distortion
D Single–Adjustment Timing
D High gain to 50MHz
D 500mV Recovered Audio at 10.7MHz
D Wide Operating Voltage Range
Absolute Maximum Ratings:
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Package Power Dissipation, PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 670mW
Derate Above +70°C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3mW/°C
Operating Ambient Temperature Range, TA . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +85°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Static Electrical Characteristics: (VCC = 12V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Supply Current
Terminal Voltage
ICC
V1
V2
V6
V9
V10
12 17 27
4.3 5.0 6.3
– 3.65 –
– 1.45 –
– 1.5 –
– 1.45 –
mA
V
V
V
mV
V

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Static Electrical Characteristics (Cont’d): (VCC = 12V, TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Detector Output Resistance
IF Input Resistance
IF Output Resistance
Detector Input Resistance
DeEmphasis Resistance
IF Input Capacitance
Detector Input Capacitance
R1
R4
R10
R12
R14
C4
C12
200
5.0 k
60
70 k
6 9 12 k
11 pF
2.7 pF
Dynamic Characteristics: (VCC = 12V, TA = +25°C, fo = 10.7MHz, fm = 400Hz, f = ±75kHz,
Peak Separation = 550kHz unless otherwise specified)
Parameter
Symbol
Test Conditions
Min Typ Max Unit
Amplifier Voltage Gain
Amplifier Output Voltage
Input Limiting Threshold
Recovered Audio Output
Total Harmonic Distortion
Ae
Vout
VTH
Vout
THD
Vin 300µVrms
Vin = 10mVrms
Note 1
V12 = 60mVrms
100% FM Modulation
53 dB
1.45 VPP
400 800 µVrms
500 mVrms
1.0 %
AM Rejection
AMR Vin = 10mVrms, Note 2
40 dB
Note 1. The input limiting threshold is the FM input voltage for a recovered audio output which is 3dB
less than the recovered audio for an FM input voltage of 200mVrms.
Note 2. The amplitude modulation rejection is determined by:
AMRdB = 20 log Vout for 100% FM Vin / Vout for 30% AM Vin
Pin Connection Diagram
Detector Output 1
Reference 2
N.C. 3
IF Input 4
Decoupling 5
IF Input Ref 6
GND 7
14 DeEmphasis
13 VCC
12 Det Input
11 Test Point
10 Amplifier Output
9 Amplifier Low Output
8 N.C.

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14 8
17
.785 (19.95)
Max
.300 (7.62)
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min