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RMV Operations Manual Revision Copyright illunis LLC, 2014
Page 70
4.8: Exposure:
Analog to Digital Conversion
RMV
cameras uses four analog to digital converters
(ADC) from Analog devices, one for each tap of the CCD
sensor. Each ADC has a programmable analog gain
stage that can be adjusted from 6dB to 40 dB. Each
ADC also incorporates an active black clamp offset con-
trol feature. The offset can be selected from 0 to 256 in
12 bit pixel space. The ADC also has a special feature
for optimizing color sensor filter response.
Serial Commands
Target
Index
Command
R/W
Description
00
01
A: Gain
R/W
A channel controls
00
02
A: Clamp Level
R/W
00
21
B: Gain
R/W
B channel controls
00
22
B: Clamp Level
R/W
01
01
C: Gain
R/W
C channel controls
01
02
C: Clamp Level
R/W
01
21
D: Gain
R/W
D channel controls
01
22
D: Clamp Level
R/W
Quick FAQ’s:
►Single tap data is sent through the B tap only.
►Dual tap data is sent through both taps, with the B
tap on the left side and the A tap on the right side.
►Two tap data is reorded in the FPGA TRO circuit.
►
An ADC maximum gain of 40dB is 100X !
►Use the offset to raise the minimum signal above
zero to see all system noise.
The RMV uses Truesence CCD sensors with 4 tap readout.
The A tap is the Left Top side and
the B tap is the Right Top side when viewed on the capture card. C tap is the Left Bottom side
and D tap is the Right Bottom side when viewed on the capture card. Dual tap mode uses CCD
Readout A and B. Single tap mode uses CCD Readout A .
Active
Imaging
Area
ADC ‘C’
12 bit
data
ADC ‘D’
12 bit
data
ADC ‘A’
12 bit
data
12 bit
data
ADC ‘B’