– 3 –
Fig. 1-2. IC911 Block Diagram
CCDIN
RG
H1-H4
VD
HD
SDATA
SCK
SL
CLI
CLPOB
CLPDM
DOUT
VRB
VRT
PRECISION
TIMING
CORE
SYNC
GENERATOR
PxGA
VGA
ADC
12
2~36 dB
PBLK
VREF
CLAMP
INTERNAL
REGISTERS
INTERNAL
CLOCKS
CDS
CLAMP
HORIZONTAL
DRIVERS
4
3. IC901 (V Driver) and IC911 (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.
IC901 is V driver. In addition the XV1-XV4 signals which are
output from IC102 are the vertical transfer clocks, and the
XSG signal which is output from IC102 is superimposed onto
XV1 and XV3 at IC901 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 IC911, and H1, H2 and RG clock are generated at
IC911.
4. IC911 (CDS, AGC Circuit and A/D Converter)
The video signal which is output from the CCD is input to Pin
(29) of IC911. 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.
5. Lens drive block
5-1. Iris and shutter drive
The shutter and iris stepping motor drive signals (IIN1, IIN2,
IIN3 and IIN4) which are output from the ASIC (IC102) are
used to drive by the motor driver (IC951), and are then used to
drive the iris steps.
5-2. Focus drive
The focus stepping motor drive signals (FIN1, FIN2, FIN3 and
FIN4) which are output from the ASIC expansion port (IC107)
are used to drive by the motor driver (IC952). Detection of the
standard focusing positions is carried out by means of the
photointerruptor (PI) inside the lens block.
5-3. Zoom drive
The zoom stepping motor drive signals (ZIN1, ZIN2, ZIN3 and
ZIN4) which are output from the ASIC expansion port (IC107)
are used to drive by the motor driver (IC952). Detection of the
standard zoom positions is carried out by means of
photoreflector (ZPI) inside the lens block.
