Canon XRD9827REF user manual

Page 10

... the analog plusTM compa

EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030

PRELIMINARY

XRD9827

1.24V

VDD

BANDGAP

C

I

S

 

12K

VRT

 

 

PIN 19

 

 

(RED)

M

 

 

RL

PIN 16

U

(VDCEXT)

X

 

2.2uF

VRB

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.

10

Page 9 Page 11
Image 10
Page 9 Page 11
Contents XRD9827REF Cannon CIS 36-BIT Color Single Line Scanner Preliminary Block Diagram of XRD9827REF Operational Procedure How to Run the XRD9827REF Demonstration S D D D D D D D D 2 1 0 7 6 5 4 3 2 1 SenseIt Software Window Before Scanning Non-calibrated Black Target Scan Preliminary XRD9827 Black Target Scan After Global and Fine Adjustment VDD VRT White Target Scan Without Gain Adjustment White Target Scan After Gain Adjustment Simplified Block Diagram Showing Gain Adjustment by XRD9827 Reference DC Standard Deviation Plot of 3.5V DC Source as Input to the XRD9827REF XRD9827 MACH435 LSB
Top Page Image Contents