– 3 –
3. IC901 (V Driver)
V driver is 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 IC101 are the vertical transfer clocks, and the
XSG signal which is output from IC102 is superimposed onto
XV1, XV3 and XV5 at IC901 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.
4. IC906 (CDS, AGC Circuit and A/D Converter)
The video signal which is output from the CCD is input to Pin
(27) of IC906. 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 10-bit.
Fig. 1-2. IC906 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
5. Lens drive block
5-1. Shutter drive
The shutter drive signal (SIN1 and SIN2) which is output from
the ASIC expansion port (IC106) is drived the shutter constant
level driver (IC951), and then shutter plunger is opened and
closed.
5-2. Iris drive
The iris stepping motor drive signals (IIN1 and IIN2) which are
output from the ASIC (IC101) are used to drive by the motor
driver (IC951).
5-3. Focus drive
The focus stepping motor drive signals (FIN1, FIN2, FIN3 and
FIN4) which are output from the ASIC (IC101) are used to
drive by the motor driver (IC951). Detection of the standard
foc us ing p os it i ons i s c ar r ie d ou t by me ans o f t h e
photointerruptor (FPI-E) inside the lens block.
5-4. Zoom drive
The zoom DC motor drive signals (ZIN1 and ZIN2) which are
output from the ASIC (IC101) are used to drive by the motor
driver (IC951). Detection of the zoom positions is carried out
by means of photoreflector (ZPI-E) inside the lens block.
