The NTE1489 is a silicon monolithic integrated circuit in a 16鈥揕ead 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鈥?/div>
fixed potentiometer. Internal circuits are composed of a stereo demodulator, a lamp driver, an input
stage pre鈥揳mplifier that is capable of establishing variable input signal levels, a VCO (Voltage Con-
trolled Oscillator) constituting PLL, a phase comparator, a LPF (Low Pass Filter), a frequency divider,
and a DC amplifier. A stereo鈥搈onaural automatic switching circuit, a circuit for manual switching,
VCO forced stop circuit, etc. are built鈥搃n.
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鈥揑n Output Stage Post Amplifier
D
Stereo鈥揗onaural Switching can be made either Automatically or Manually from Outside. The
Shock Noise at Switching is Reduced Considerably.
D
Stereo鈥揗onaural 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鈥搕o鈥揘oise Ratio
D
Wide Maximum Input Level
Absolute Maximum Ratings:
(T
A
= +25擄C unless otherwise specified)
Supply Voltage, V
CC
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15V
Lamp Current, I
L
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75mA
Package Dissipation (T
A
= +70擄C), P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 400mW
Operating Temperature Range, T
opr
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +70擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +125擄C
Recommended Operating Conditions:
(T
A
= +25擄C unless otherwise specified)
Parameter
Supply Voltage
Symbol
V
CC
Test Conditions
Min
9
Typ
12
Max
15
Unit
V
1
2
3
