Canon XRD9827REF - Manual (Page 10)

... the analog plus compa TM
EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030
PRELIMINARY
10
RL
VRT
VRB
VDD
XRD9827
C
I
S
PIN 19
(RED)
2.2uF
PIN 16
(VDCEXT)
BANDGAP
1.24V
M
U
X
12K
Figure 7. Simplified Block Diagram Showing Global Offset Adjustment by XRD9827 Using
Internal Bandgap and CIS Using VDCEXT for Biasing
18. Set the dip switches to [001 01010000] to select the internal offset DAC for fine offset adjustment.
Push the Serial Port button. From the CAPTURE menu select SNAP SHOT. The offset should now move
the output of the CIS to almost zero scale. The other way to do a SNAP SHOT is by pressing CTRL and B
button at the same time. Please refer to data sheet for offset adjustment. A typical result of the fine offset
adjustment is shown below.