AMIS-720442 Datasheet, PDF (14/16 Pages) AMI SEMICONDUCTOR – 400dpi Contact Image Sensor

AMIS-720442-A: 400dpi Contact Image Sensor
Data Sheet
13.0 Typical A6 CIS Module Circuit
A typical A6 CIS module circuit, using the AMIS-720442-A sensors, is shown in Figure 12. The circuit is provided as reference to
illustrate the interconnection of the AMIS-720442-A for a serially cascaded line of image sensors. It is a typical A6 size CIS module
produced by AMIS. It provides the first-time user with additional insight for designing a CIS module and supplements the circuit
descriptions given in the Section, Signal Conversion Circuit.
The difference is in the arrangement of the two shunt switches, U3D and U3A. U3D is a counterpart to SW in Figure 5. A DC restoration
capacitor, C20, with a value of 500pf, is added between the shunts switch. The first, U3D, clamps the video line to ground to reset the
image sensors. Simultaneously, the second, U3A, clamps the node between C15 and the amplifier input to an output reference bias
voltage that is on the node between R4 and R9. These resistors are voltage dividers that set the DC operating level of the amplifier’s
output by applying the same bias voltage to both inputs of the amplifier.
See Figure 12 for the typical A6 CIS module circuit.
AMI Semiconductor – May 06, M-20571-001
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