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14 August 1997
3.1.2 ANALOG PROCESSING
f r o m S B U
Z/C
E V E N
Z/C
Analog Process IC 1
f r o m S B U
O D D
1. Signal Composition
Analog signals for odd and even pixels are merged by a switching device in
the GA1, not in the Analog Process ICs.
2. Signal Amplification
This function is the same as in the A133 machine.
3. A/D conversion
Converts individual pixels to 8-bit digital signals.
4. Feedback - D/A Conversion
There are no D/A converters in the Analog Process ICs. Instead of this,
there is a D/A converter outside the IC, and the CPU controls the feedback
signal for the Analog Process ICs via the D/A converter.
The CPU ignores the Z/C which is before the multiplexer.
AGC
Multi-
plexer
P/H
Analog Process IC 2
13
Z/C
Vin
A/D
8
SEL
Vref
Vin
A/D
Vref
EX-IPU
D/A
CPU
GA1
(GARD1S)
NVRAM
A217D504.vsd
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