HA118144AF ETC, HA118144AF Datasheet - Page 19

• Manufacturer Part Number: HA118144AF
• Description: Video Camera CDS/AGC IC
• Manufacturer: ETC

HA118144AF
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Gain select
The gain select circuit can be set to one of
eight gain levels from –0.2 dB to 10.1 dB in
1.5 dB increments according to 3 bits of
control data. The gain select circuit setting is
used to adjust the input level to the AGC
circuit in the next stage.
AGC gain
The AGC gain is set by 7 bits of control data.
The setting range is from 0 dB to 21 dB.
Internally, the circuit is divided into two stages,
AGC1 (pre-stage) and AGC2 (post-
1
2
3
4
5
6
A
B
Figure 3 CDS Timing Chart
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stage), which together realize a variable
amplification of up to 21 dB.
The application should implement an auto-
aliasing function by processing the camera
DSPIC iris result in the microprocessor, and
using that to control the AGC gain in this IC
using serial data transfers.
Knee level
The amplifier I/O characteristics are shown in
figure 4. The inflection point where the gain
changes is determined by 5 bits of data.
Low FREQ noise
HA118144AF
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