NTE723
Integrated Circuit
FM Sound System
Description:
The NTE723 is a monolithic integrated circuit FM detector/limiter and audio preamplifier that requires
a minimum of external components for operation. It includes three stages of IF limiting and a differen-
tialpeakdetection circuit.
Features:
D
Simple detector alignment: one coil
D
Sensitivity: 3dB limiting voltage 250
V typical at 10.7MHz
D
Low harmonic distortion
D
Excellent AM rejection 55dB typ. at 10.7MHz
D
Internal audio preamplifier
Absolute Maximum Ratings:
Power Supply Current (Pin5)
30mA
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Supply Voltage (Pin5)
12.5V
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Power Dissipation (Note 1), P
D
715mW
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Operating Temperature Range, T
opr
40
to +85
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage Temperature Range, T
stg
65
to +150
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Lead Temperature (During Soldering , 10sec), T
L
+300
C
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Note 1. For operation in ambient temperatures above 25
C, the device must be derated based on
a 150
C maximum junction temperature and a thermal resistance of 175
C/W junction to
ambient.
Electrical Characteristics: (T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Static Characteristics
Supply Current
I
5
V
CC
= 8.5V
8.5
15
mA
V
CC
= 11.2V
17.5
mA
V
CC
= 12.5V
19
29
mA
Detector Output Level, High
V
7
6.1
V
Detector Output Level, Low
V
8
V
CC
= 11.2
5.4
V
Audio Amplifier Output
V
12
5.2
V
Electrical Characteristics (Cont'd): (T
A
= +25
C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max
Unit
Dynamic Characteristics (V+ = 11.2V, f
o
= 10.7MHz,
f =
75kHz, f
m
= 400Hz)
Input Limiting Threshold
V
IN(LIM)
250
600
V
AM Rejection
AMR
AM: 1kHz @ 30%, V
IN
= 100mV
55
dB
Recovered AF Voltage (At Pin12)
V
O(AF)
1.5
V
Total Harmonic Distortion
THD
1
2
%
Audio Preamplifier
Voltage Gain
A
V(AF)
V
IN
= 100mV, f = 400Hz
21
dB
Total Harmonic Distortion
THD
V
OUT
= 2V, f = 400Hz
1.5
5.0
%
V
CC
Buffer Output
Tone Control
1
2
3
4
IF Input
IF Input Bias
GND
Zener Regulator
5
6
N.C.
7
DeEmphasis
14
13
12
11
Audio Input
Audio Output
N.C.
10
Detector
9
Detector
8
.600 (15.24)
1
7
14
8
.300
(7.62)
.200 (5.08)
Max
.100 (2.45)
.099 (2.5) Min
.785 (19.95)
Max
Pin Connection Diagram
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