PI3041A Datasheet, PDF (16/18 Pages) AMI SEMICONDUCTOR – Contact Image Sensor 300DPI CIS Sensor Chip

Preliminary PI3041A datasheet
(2) Prohibit crossing time is to insure that no two start pulses are locked into the shift
register for any single scan time. Since the start pulse is entered into the shift
register during its active high level when the CP clock edges falls, the active high
of the start pulse is permitted only during one falling, CP, clock edges for any
given scan. Otherwise, multiple start pulses will load into the shift register.
(3) Pixel delay times and settling time depend on the output amplifier, which is
employed. These values, tdl and ts/h, are measured with the amplifier see in
Figure 8. Typical A6 CIS Module Circuit using the PI3041A sensors. Note, the
impulse signal current out of the device has pulse width ~ 30 ns. Hence, the
faster the amplifier with a faster settling time will yield a signal video pulse with
faster rise and settle times.
Typical A6 CIS Module Circuit
See Figure 8. Typical A6 CIS Module Circuit using the PI3041A sensors. The circuit is provided as
reference to illustrate the interconnection of the PI3041A for a serially cascaded line of image sensors.
It is a typical A6 size CIS module produced by PIC. 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. Video Output Test and Application Circuit. A DC restoration capacitor, C20,
with value of 500pf 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 amplifier input to an output reference bias voltage that is on the node
between R4 and R9. These resistors are voltage divider that sets the DC operating level of
the amplifier’s output by applying same bias voltage to both inputs of the amplifier
(See next page for the Typical A6 CIS Module Circuit.)
Page 16 of 18 Date: 09/23/05