Datasheet for Ic-fm IF Amp- AF Preamp

Datasheet for Ic-fm IF Amp- AF Preamp
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 differential–peak–detection circuit.
Features:
D Simple detector alignment: one coil
D Sensitivity: 3dB limiting voltage 250µV 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), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 715mW
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +85°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –65° to +150°C
Lead Temperature (During Soldering , 10sec), TL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +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: (TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max Unit
VCC = 8.5V
8.5
15
–
mA
VCC = 11.2V
–
17.5
–
mA
VCC = 12.5V
–
19
29
mA
–
6.1
–
V
–
5.4
–
V
–
5.2
–
V
Static Characteristics
Supply Current
I5
Detector Output Level, High
V7
Detector Output Level, Low
V8
Audio Amplifier Output
V12
VCC = 11.2
Electrical Characteristics (Cont’d): (TA = +25°C unless otherwise specified)
Parameter
Symbol
Test Conditions
Min
Typ
Max Unit
–
250
600
µV
–
55
–
dB
VO(AF)
–
1.5
–
V
THD
–
1
2
%
VIN = 100mV, f = 400Hz
–
21
–
dB
VOUT = 2V, f = 400Hz
–
1.5
5.0
%
Dynamic Characteristics (V+ = 11.2V, fo = 10.7MHz, ∆f = ±75kHz, fm = 400Hz)
Input Limiting Threshold
VIN(LIM)
AM Rejection
AMR
Recovered AF Voltage (At Pin12)
Total Harmonic Distortion
AM: 1kHz @ 30%, VIN = 100mV
Audio Preamplifier
Voltage Gain
AV(AF)
Total Harmonic Distortion
THD
Pin Connection Diagram
IF Input
1
14 Audio Input
IF Input Bias
2
13 Tone Control
GND
3
12 Audio Output
Zener Regulator
4
11 N.C.
VCC
5
10 Detector
N.C.
6
9
Detector
De–Emphasis
7
8
Buffer Output
14
8
1
7
.300
(7.62)
.785 (19.95)
Max
.200 (5.08)
Max
.100 (2.45)
.600 (15.24)
.099 (2.5) Min
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