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Exar XRD9827REF User Manual

Cannon cis 36-bit color single line scanner
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XRD9827REF
USER MANUAL
CANNON CIS 36-BIT COLOR
SINGLE LINE SCANNER

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Summary of Contents for Exar XRD9827REF

  • Page 1 XRD9827REF USER MANUAL CANNON CIS 36-BIT COLOR SINGLE LINE SCANNER...

  • Page 2: System Requirements

    Linear CIS/CCD Sensor Signal Processor to output a single line scan and display the amplitude of each of the three colors. The XRD9827REF is designed to provide a signal path for the CIS output signals to be processed, digitized by the XRD9827 and transmitted to a personal computer. There are no software algorithms or hardware implementations, for example, gamma correction, to adjust for color response.
  • Page 3 1 to 10 and an 8-Bit programmable input referred offset calibration range of 800 mV. The XRD9827 also provides the necessary biasing voltage for the CANON CIS, eliminating the use of external components (two diodes and two resistors). See the XRD9827EVAL User Manual / PCB board for evaluating the XRD9827 CIS / CCD signal processor chip.

  • Page 4: Operational Procedure

    The routine listed below will first calibrate the photo response of the CIS using the XRD9827 by optimize its offset and gain. After calibration, the XRD9827REF can be used to scan any color target to show CIS non-color corrected response. (Color correction is typically done in the digital ASIC.)
  • Page 5 Offset Adjustment With a Black Target 11. Set the dip switches located on the side panel of the scanner to [110 01000000] as shown in Figure 3 and push the Serial Port button which is located on the front panel of the demo system. This will reset the...
  • Page 6 ... the analog plus compa EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY Figure 3. Dip Switches Set to Value [110 01000000] to Reset XRD9827 12. Select the Start Menu, choose Programs, then choose SenseIt icon 13.
  • Page 7 Input/Output Range of Printer Port of your computer. The default setting is 378H. 15. Pick the black target out from the kit and put it on a flat area. Place the XRD9827REF on top of the black target with the CIS sensor facing downwards. From the CAPTURE menu select SNAP SHOT (or simply press CTRL and B buttons simultaneously) for a single line scan of the black target with the dip switches set to [000 00000000].
  • Page 8 ... the analog plus compa EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY Figure 5. Non-calibrated Black Target Scan 16. Set the dip switches to [110 00010000] to tie VDCREF and VDCEXT pin together internally. Push the Serial Port button.
  • Page 9 1.24V reference voltage provided by an internal bandgap is applied to the VDCEXT pin. VDCEXT is connected to VREF pin (Pin 5) of the CANON CIS, this voltage is used by the CIS as a biasing voltage. Moreover, a 12K built-in resistor of the XRD9827 serves as a pull-down for the output of the CIS. By interfacing the XRD9827 with a CANON CIS, a designer can save two biasing diodes and two resistors and thus reduce cost.
  • Page 10 ... the analog plus compa EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY XRD9827 1.24V PIN 19 (RED) PIN 16 (VDCEXT) 2.2uF Figure 7. Simplified Block Diagram Showing Global Offset Adjustment by XRD9827 Using Internal Bandgap and CIS Using VDCEXT for Biasing 18.
  • Page 11 ... the analog plus compa EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY Figure 8. Black Target Scan After Global and Fine Adjustment...
  • Page 12 ... the analog plus compa EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY XRD9827 PIN 19 (RED) Figure 9. Simplified Block Diagram Showing Fine Offset Adjustment by XRD9827 19. Switch the black target to the enclosed white target. From the CAPTURE menu select SNAP SHOT for a single line scan of the white target.
  • Page 13 CAPTURE menu select SNAP SHOT. The gain should move the output of the CIS to almost full scale. Please refer to data sheet for further gain adjustment and optimal values of dip switches for your scanner. A typical result of the white target with gain adjustment is shown below.
  • Page 14 ... the analog plus compa EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY Figure 11. White Target Scan After Gain Adjustment...
  • Page 15 ... the analog plus compa EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY XRD9827 PIN 19 (RED) Figure 12. Simplified Block Diagram Showing Gain Adjustment by XRD9827 21. Once the XRD9827 has been fully calibrated, any target can be scanned. For example: Scan a gray scale to demonstrate the stair step response or a color target for color responsitivity.
  • Page 16 As we can see from Table 1, the SNR falls into the range of 58 dB to 63 dB when a DC reference is used as input to the XRD9827REF. The system alone gives a 9 1/2 to 10 bit performance. The largest noise source we saw in previous scans came from the CIS.
  • Page 17 EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030 PRELIMINARY Figure 14. Plot of 3.5V DC Source as Input to the XRD9827REF Important: If at any time an unexpected result is shown or the demo system seems to not working, please pull the AC adapter out from the wall outlet to cycle power.
  • Page 18 0.01uF AGND DB7/LD DB6/SDATA DB5/SCLK ADCCLK SYNC AVDD POWER SUPPLY CIRCUITS DVDD OPEN H:\PROJECT\ORCADWIN\9827\9827REFB.DSN DVDD Title XRD9827 REFERENCE BOARD Size Document Number XRD9827REF Date: Thursday, July 23, 1998 GO TO LED ON THE CASE OF SCANNER HEADER 2 DGND Sheet...
  • Page 19 CLK0 CLK1 IO16 0.1uF IO17 IO18 IO19 IO20 IO21 IO22 IO23 IO24 CISCLK IO25 IO26 IO27 BLED IO28 IO29 RLED IO30 GLED IO31 H:\PROJECT\ORCADWIN\9827\9827REFB.DSN Title XRD9827 REFERENCE BOARD Size Document Number XRD9827REF DGND Date: Thursday, July 23, 1998 Sheet DGND...
  • Page 20 MODE OPEN GND (ANALOG) VREF CISCLK LED ANODE BLED GLED RLED GND (FRAME) HEADER 12 TO CIS DGND 100uF 0.1uF 47uF 47uF DGND H:\PROJECT\ORCADWIN\9827\9827REFB.DSN AGND Title XRD9827 REFERENCE BOARD Size Document Number XRD9827REF Date: Thursday, July 23, 1998 AGND Sheet...