– 3 –
3. IC902, IC903 (V Driver) and IC905 (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.
IC902 and IC903 are V driver. In addition the XV1-XV6 sig-
nals which are output from IC101 are the vertical transfer
clocks, and the XSG signal is superimposed at IC902 and
IC903 in order to generate a ternary pulse. In addition, the
XSUB signal which is output from IC101 is used as the sweep
pulse for the electronic shutter. A H driver is inside IC905,
and H1, H2 and RG clock are generated at IC905.
Fig. 1-2. IC905 Block Diagram
CCDIN
RG
H1-H4
VD
HD
SDATA
SCK
SL
CLI
DOUT
VRB
VRT
PRECISION
TIMING
CORE
SYNC
GENERATOR
PxGA
VGA
ADC
10
2~36 dB
VREF
CLAMP
INTERNAL
REGISTERS
INTERNAL
CLOCKS
CDS
CLAMP
HORIZONTAL
DRIVERS
4
4. IC905 (CDS, AGC Circuit and A/D Converter)
The video signal which is output from the CCD is input to Pin
(27) of IC905. 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 (32). The video signal is carried out
A/D converter, and is output by 12-bit.
