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Exar XRD9829REF User Manual

Cis 30-bit color single line scanner
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July 1998-2
XRD9829REF
USER MANUAL
CIS 30-BIT COLOR SINGLE LINE SCANNER
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017

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Summary of Contents for Exar XRD9829REF

  • Page 1 July 1998-2 XRD9829REF USER MANUAL CIS 30-BIT COLOR SINGLE LINE SCANNER EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017...

  • Page 2: System Requirements

    EXAR’s XRD9829, a 10-bit Linear CIS/CCD Sensor Signal Processor to get a single line scan. The XRD9829REF is designed to provide a signal path for the CIS output signals to be processed, digitized by the XRD9829 and transmitted to a personal computer. There are no software algorithms or hardware implementations to adjust for true color response.
  • Page 3 XRD9829 CONTROL SIGNALS CIS CONTROL SIGNALS Figure 1. Block Diagram of XRD9829REF The XRD9829 is a complete linear CIS or CCD sensor signal processor on a single monolithic chip. The XRD9829 includes a high speed 10-Bit ADC, a 6-Bit Programmable Gain Amplifier with gain adjustment of 1 to 10 and an 8-Bit programmable input referred offset calibration range of 800 mV.

  • Page 4: Operational Procedure

    The routine listed below will first calibrate the photo response of the CIS using the XRD9829. After calibration, the XRD9829REF can be used to scan any color target to show CIS non-color corrected response. (Color correction is typically done in the digital asic.) How to Run the XRD9829REF Demonstration: 1.
  • Page 5 Offset Adjustment With a Black Target 11. Set the dip switches located on the side panel of the scanner to 1100010000 as shown in Figure 2 and push the Serial Port button which is located on the front panel of the demo system.
  • Page 6 XRD9829REF Figure 3. Dip Switches Set to Value 1100010000 to Reset the XRD9829 Rev. 1.00...
  • Page 7 STATES) PIN (VIN3 PIN VIN2 PIN BECOMES (VIN2 PIN (PGA OUTPUT AN OUTPUT) BECOMES DISCONNECTED AN OUTPUT) FROM INPUT OF ADC) XRD9829REF Power-up State (Note 1) 000000XX (LSB) 01000000 (LSB) MUX SEL MUX SEL XX000000 0 0: VIN0 0 1: VIN1...
  • Page 8 XRD9829REF 12. Select the Start Menu, choose Programs, then choose XRD9829REF icon 13. A window will pop up as shown below. The upper window shows the Plot of Captured Data and the lower window shows the Histogram of data. Figure 3 shows the pop- up window when ScanIt is first s t a r t e d .
  • Page 9 15. Pick the black target out from the kit and put it on a flat area. Place the XRD9829REF on top of the black target with the CIS sensor facing downwards. From the CAPTURE menu select SNAP SHOT for a single line scan of the black target with the dip switches set to zero.
  • Page 10 XRD9829REF Figure 6. Black Target Scan After Global Offset Adjust Rev. 1.00...
  • Page 11 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. Please refer to data sheet for offset adjustment. A typical result of the fine offset adjustment is shown below. Rev. 1.00 XRD9829REF...
  • Page 12 XRD9829REF Figure 8. Black Target Scan After Global and Fine Adjust Rev. 1.00...
  • Page 13 XRD9829REF XRD9829 VIN0 8-Bit Offset Figure 9. Simplified Block Diagram Showing Fine Offset Adjustment by XRD9829 18. 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. A typical result of a white target is shown below.
  • Page 14 From the 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 15 XRD9829REF Figure 11. White Target Scan After Gain Adjustment Rev. 1.00...
  • Page 16 XRD9829REF XRD9829 VIN0 6-Bit Gain Register Figure 12. Simplied Block Diagram Showing Gain Adjustment by XRD9829 20. Once the XRD9829 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 Rev.
  • Page 17 AC adapter out from the wall outlet to cycle power. Start the procedures again from Step 11. 2. Keep the scanner away from other electrical equipment, power cords, light dimmers etc. as stray electrical fields can end up in the digitized data.
  • Page 18 Schematics for XRD9829REF Page 1 of 3.
  • Page 19 Schematics for XRD9829REF Page 2 of 3.
  • Page 20 Schematics for XRD9829REF Page 3 of 3.
  • Page 21 XRD9829REF Notes Rev. 1.00...
  • Page 22 XRD9829REF Notes Rev. 1.00...
  • Page 23 XRD9829REF Notes Rev. 1.00...
  • Page 24 XRD9829REF NOTICE EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described herein, conveys no license under any patent or other right, and makes no representation that the circuits are free of patent infringement.