NTE1489 Integrated Circuit Stereo Demodulator

NTE1489 Integrated Circuit Stereo Demodulator
NTE1489
Integrated Circuit
Stereo Demodulator
Description:
The NTE1489 is a silicon monolithic integrated circuit in a 16–Lead DIP type package designd for use
as an FM multiplex demodulator for high class stere FM tuners. As the IC adopts a PLL (Phase Lock
Loop) system, complexity of contol is usually experienced when using conventional external coil is
eliminated and the demodulator can easily be constructed by simply controlling the external semi–
fixed potentiometer. Internal circuits are composed of a stereo demodulator, a lamp driver, an input
stage pre–amplifier that is capable of establishing variable input signal levels, a VCO (Voltage Controlled Oscillator) constituting PLL, a phase comparator, a LPF (Low Pass Filter), a frequency divider,
and a DC amplifier. A stereo–monaural automatic switching circuit, a circuit for manual switching,
VCO forced stop circuit, etc. are built–in.
Features:
D Fewer External Components. Coil is not used.
D Low Monaural Total Harmonic Distortion
D Low Stereo Total Harmonic Distortion
D High Channel Separation
D Built–In Output Stage Post Amplifier
D Stereo–Monaural Switching can be made either Automatically or Manually from Outside. The
Shock Noise at Switching is Reduced Considerably.
D Stereo–Monaural Switching Operation is perfectly Synchronized with the Stereo Indicator Lamp
D Monitoring of VCO Free Running Frequency can be Performed by Directly Connecting the Frequency Counter to Pin9.
D High Signal–to–Noise Ratio
D Wide Maximum Input Level
Absolute Maximum Ratings: (TA = +25°C unless otherwise specified)
Supply Voltage, VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Lamp Current, IL . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA
Package Dissipation (TA = +70°C), PD . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mW
Operating Temperature Range, Topr . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –20° to +70°C
Storage Temperature Range, Tstg . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . –40° to +125°C
Recommended Operating Conditions: (TA = +25°C unless otherwise specified)
Parameter
Supply Voltage
Symbol
VCC
Test Conditions
Min
Typ
Max
Unit
9
12
15
V
Electrical Characteristics: (TA = +25°C, VCC = 12V, f = 1kHz, R1 = 47kΩ, R+L = 270mV,
Pilot = 30mV unless otherwise specified)
Parameter
Symbol
Supply Current
ICC
Channel Separation
Test Conditions
Min
Typ
Max
Unit
12
20
30
mA
f = 100Hz
40
50
–
dB
f = 1kHz
45
55
–
dB
f = 10kHz
35
45
–
dB
9
13
17
dB
No Signal
Sep.
Pilot = 30mV
Voltage Gain
AV
Monaural, Vin = 300mV, Note 1
Channel Balance
CB
Monaural, Vin = 300mV
–1.5
0
1.5
dB
Stereo, Pilot = 30mV
–1.5
0
1.5
dB
–
0.02
0.1
%
f = 100Hz
–
0.02
–
%
f = 1kHz
–
0.02
0.1
%
f = 10kHz
–
0.12
–
%
Pilot Level, R1 = 47kΩ
6
12
20
mVrms
–
6
–
dB
–
%
Monaural Total Harmonic Distortion
THD
Vin = 300mV
Stereo Total Harmonic Distortion
THD
R+L = 270mV,
Pilot = 30mV
Pilot Level for Lamp ON
L –ON
Stereo Lamp Hysteresis
Hy.
Pilot Level
Capture Range
CR
Pilot = 30mV
Ultrasonic Frequency Rejection
SCA Rejection
±1.5 ±3.0
19kHz Rej. Pilot = 30mV
–
35
–
dB
38kHz Rej. Pilot = 30mV
–
45
–
dB
SCA Rej.
Pilot = 30mV, SCA = 30mV
–
70
–
dB
Maximum Input Level
Vin
Monaural, THD = 1%
–
0.7
–
Vrms
Signal–to–Noise Ratio
S/N
Vin = 300mV, After LPF
–
82
–
dB
Stereo–Monaural Switching
SW–ON Voltage
Vs
Pin16 Voltage where Stereo
Lamp – OFF
–
1.4
1.6
V
VCO Stop Voltage
Vo
Pin16 Voltage where VCO Stops
7
–
VCC
V
Note 1. AV is from the output level measured at the IC output terminal. AV can be set by the input
impedance R1.
Pin Connection Diagram
VCC 1
Preamp Input 2
Preamp Output 3
16 Stereo/Mono Switch & VCO Stop
15 OSC RC Network
14 Loop Filter
Postamp Bias 4
13 Loop Filter
Postamp Bias 5
12 Detector Input
Rt Ch Output 6
11 Switch Filter
Lt Ch Output 7
10 Switch Filter
GND 8
9 Stereo Lamp & 19kHz Monitor
16
9
.260 (6.6) Max
1
8
.785 (19.9) Max
.300 (7.62)
.200 (5.08)
Max
.245
(6.22)
Min
.100 (2.54)
.700 (17.7)
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