Sanyo VPC-X360, Service Manual

−

3

−

1A 1

1Y 2

2A 3

2Y 4

3A 5

3Y 6

GND 7

4Y

8

4A

9

5Y

10

5A

11

6Y

12

6A

13

V

CC

14

Fig. 1-2. IC902 Block Diagram

1

18

10

9

8

7

6

5

4

3

2

14

15

16

17

20

19

11

12

13

CPP1

CPP2

DC OUT

VSHT

V

φ

1

V

L

V

φ

2

V

φ

4

V

M

V

φ

3

XV4

CPP3

VH

DCIN

XSHT

XV2

XV1

XSG1

XV3

XSG2

+

‑

Change Pump

Fig. 1-3. IC904 Block Diagram

3. IC902 (H Driver) and IC904 (V Driver)

An H driver (IC902) and V driver (IC904) are necessary in
order to generate the clocks (vertical transfer clock, horizon-
tal transfer clock and electronic shutter clock) which driver
the CCD.
IC902 is an inverter IC which drives the horizontal CCDs (H1
and H2). In addition the XV1-XV4 signals which are output
from Pins (166), (167), (169) and (171) of IC102 are the ver-
tical transfer clocks, and the XSG1 and XSG2 signals which
is output from Pins (168) and (170) of IC102 is superimposed
onto XV1 and XV3 at IC904 in order to generate a ternary
pulse. In addition, the XSUB signal which is output from Pin
(165) of IC102 is used as the sweep pulse for the electronic
shutter, and the RG signal which is output from Pin (159) of
IC102 is the reset gate clock.

4. IC905 (CDS, AGC Circuit and A/D converter)

The video signal which is output from the CCD is input to
Pins (26) and (27) of IC905. There are S/H blocks inside IC905
generated from the XSHP and XSHD pulses, and it is here
that CDS (correlated double sampling) is carried out.
After passing through the CDS circuit, the signal passes
through the AGC amplifier. It is A/C converted internally into
a 10-bit signal, and is then input to IC102 of the CA2 circuit
board. The gain of the AGC amplifier is controlled by the volt-
age at pin (29) which is output from IC102 of the CA2 circuit
board and smoothed by the PWM.

Fig. 1-4. IC905 Block Diagram

27

29

36

26

16

22

21

30

23

19

11

12

17

PBLK

A/D

ACVDD

CMLEVEL VRT VTB STBY CLPOB ADCMODE

TIMING

GENERATOR

CLPDM PGACONT1 PGACONT2 SHP SHD ADCCLK

PIN

DIN

ADCIN

DOUT

DRVDD

DVDD

ADVDD

2

37

20

18

47

48

43

33

41

CLAMP

REFERENCE

CLAMP

CDS

PGA

MUX

S/H

AD9802

10