Sanyo VPC-AZ3EX Service Manual page 3

3. IC934 (V Driver) and IC931 (H Driver)
An H driver and V driver are necessary in order to generate
the clocks (vertical transfer clock, horizontal transfer clock
and electronic shutter clock) which driver the CCD. IC934 is
V driver. In addition the XV1-XV4 signals which are output
from IC102 are the vertical transfer clocks, and the XSG sig-
nal which is output from IC102 is superimposed onto XV1
and XV3 at IC934 in order to generate a ternary pulse. In
addition, the XSUB signal which is output from IC102 is used
as the sweep pulse for the electronic shutter. A H driver is
inside IC931, and H1, H2 and RG clock are generated at
IC931.
4. IC931 (CDS, AGC Circuit and A/D Converter)
The video signal which is output from the CCD is input to Pin
(29) of IC931. There are inside the sampling hold block, AGC
block and A/D converter block.
The setting of sampling phase and AGC amplifier is carried
out by serial data at Pin (37) of IC911. The video signal is
carried out A/D converter, and is output by 12-bit.
CDS PxGA
CCDIN
CLAMP
INTERNAL
CLOCKS
PRECISION
RG
HORIZONTAL
4 TIMING
DRIVERS
H1-H4
CORE
SYNC
GENERATOR
HD
Fig. 1-2. IC931 Block Diagram
VRT VRB
VREF
2~36 dB
12
DOUT
VGA ADC
CLAMP
CLPOB
CLPDM
PBLK
CLI
INTERNAL
REGISTERS
SL
VD SCK SDATA
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