Daewoo DTD-25G1 ME, Руководство по обслуживанию

Страница: 40 / 54

- 5 -
APPENDIX
PIN NAME FUNCTION INTERFACE
8 RF AGC An output terminal for RF AGC.
A pull up resister is required because of its
open collector output. A de-coupling capacitor
is also connected to reduce noise.
9 1’st SIF IN An input terminal for 1’st SIF signal.
10 IF AGC A terminal should be connceted to an IF AGC
filter. Connect 2.2uF capacitor to Vcc.
11 APC FILTER A terminal should be connected with an APC
filter for chroma demodulation.
This terminal voltage controls the frequency
of VCXO.
12 X’TAL A terminal should be connected with a
(4.43MHZ) 4.433619MHz X’tal oscillator. The oscillated
signal leads to the chroma demodulation, H
out frequency tuning, AFT, etc.
IC DESCRIPTION