NTE743
Integrated Circuit
Phase Lock Loop (PLL) Stereo Decoder
Description:
The NTE743 requires only a single, non critical resistive tuning adjustment. This device derives left
and right audio channels from the standard composite stereo decoder can also be used in a number
of subscription TV decoder schemes or in various proposed TV stereo systems.
Using phase鈥搇ock techniques, the subcarrier (38 KHz for FM stereo) is regenerated in phase with and
at exactly twice the frequency of the transmitted pilot signal. Switching between monaural and stereo
operation is accomplished automatically by the presence of the pilot signal.
Low鈥搃mpedance emitter鈥揻ollower outputs and an internal voltage regulator for increased stability
make the NTE743 suitable for both line鈥搊perated and automotive applications. It is designed to oper-
ate over a wide supply鈥搗oltage range and will function with supplies as low as 9V.
Features:
D
D
D
D
D
D
D
Internal Temperature Compensation
Single鈥揂djustment Tuning
Automatic Stereo/Mono Switching
Stereo Indicator Lamp Driver
70dB SCA Rejection
Operating Voltage鈥?9 to 16V
Low Harmonic Distortion
Absolute Maximum Ratings:
Supply Voltage, V
CC
Continous . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +16V
鈮?5s
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +22V
Lamp Supply Voltage, V
LAMP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +22V
Lamp Current, I
LAMP
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 150mA
Output Current, I
4
or I
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10mA
Package Power Dissipation, P
D
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 670mW
Derate Above 70擄C . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8.3mW/擄C
Operating Temperature Range, T
A
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?0擄 to +85擄C
Storage Temperature Range, T
stg
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 鈥?5擄 to +150擄C
1
2
3
