NTE NTE1489 Datasheet

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 Fre-
quency Counter to Pin9.
D High Signal–to–Noise Ratio D Wide Maximum Input Level
Absolute Maximum Ratings:
Supply Voltage, V Lamp Current, I Package Dissipation (T
CC
L
= +70°C), P
A
Operating Temperature Range, T Storage Temperature Range, T
(TA = +25°C unless otherwise specified)
D
opr
stg
Recommended Operating Conditions:
Parameter Symbol Test Conditions Min Typ Max Unit
Supply Voltage V
CC
15V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
75mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
400mW. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–20° to +70°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
–40° to +125°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
(TA = +25°C unless otherwise specified)
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 Test Conditions Min Typ Max Unit
Supply Current I Channel Separation Sep. Pilot = 30mV f = 100Hz 40 50 dB
Voltage Gain A Channel Balance CB Monaural, Vin = 300mV –1.5 0 1.5 dB
Monaural Total Harmonic Distortion THD Vin = 300mV 0.02 0.1 % Stereo Total Harmonic Distortion THD
Pilot Level for Lamp ON L –ON Pilot Level, R1 = 47k 6 12 20 mV Stereo Lamp Hysteresis Hy. Pilot Level 6 dB Capture Range CR Pilot = 30mV ±1.5 ±3.0 % Ultrasonic Frequency Rejection 19kHz Rej. Pilot = 30mV 35 dB
SCA Rejection SCA Rej. Pilot = 30mV, SCA = 30mV 70 dB
CC
V
38kHz Rej. Pilot = 30mV 45 dB
No Signal 12 20 30 mA
f = 1kHz 45 55 dB f = 10kHz 35 45 dB
Monaural, Vin = 300mV, Note 1 9 13 17 dB
Stereo, Pilot = 30mV –1.5 0 1.5 dB
R+L = 270mV, Pilot = 30mV
f = 100Hz 0.02 % f = 1kHz 0.02 0.1 % f = 10kHz 0.12 %
rms
Maximum Input Level V Signal–to–Noise Ratio S/N Vin = 300mV, After LPF 82 dB Stereo–Monaural Switching
SW–ON Voltage
VCO Stop Voltage V
in
V
s
o
Monaural, THD = 1% 0.7 V
Pin16 Voltage where Stereo Lamp – OFF
Pin16 Voltage where VCO Stops 7 V
1.4 1.6 V
CC
rms
V
Note 1. AV is from the output level measured at the IC output terminal. AV can be set by the input
impedance R
.
1
Preamp Input
Preamp Output
Postamp Bias Postamp Bias
Rt Ch Output
Lt Ch Output
Pin Connection Diagram
V
CC
1 2
3 4 5 6 7
16 15
14 13 12 11 10
Stereo/Mono Switch & VCO Stop OSC RC Network
Loop Filter Loop Filter Detector Input Switch Filter Switch Filter
GND
8
9
Stereo Lamp & 19kHz Monitor
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