Canon XRD9827REF - Manual (Page 9)

... the analog plus compa TM
EXAR Corporation 48720 Kato Road, Fremont, CA 94538 Phone (510)-668-7000, Fax (510)-668-7030
PRELIMINARY
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Figure 6. Black Target Scan After Global Offset Adjust Using the 9827 Internal
Bandgap Reference Voltage
17. Then, set the dip switches to [111 00010000] and push the Serial Port button again. By doing this, a
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.