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 = 47kΩ 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