IBIS4-14000-M Datasheet, PDF (10/30 Pages) Cypress Semiconductor – 14-Megapixel CMOS Image Sensor

Notes on analog video signal and output amplifier specifica-
tions:
• Video polarity: the video signal is negative going with
increasing light level.
• Signal offset: the analog offset of the video signal is settable
by an external DC bias (pin 12 DARKREF). The settable
range is between 1.7V and 3V, with 2.65V being the nominal
expected set point. The output range (including 1.2V video
signal) is thus between 3V and 0.5V.
• Power control: the output amplifiers can be switched
between an “operating” mode and a “standby” mode via the
serial port of the imager (see SPI register configuration).
• Coupling: the IBIS4-14000 can be DC- or AC-coupled to the
AD converter.
2.2.5 Output Amplifier Crossbar Switch (multiplexer)
A crossbar switch is available that routes the green pixels
always to the same output (this is useful for a color device to
avoid gain and offset differences between green pixels). The
switch can be controlled automatically (with a toggle on every
CLK_Y rising edge) or manually (through the SPI register).
Figure 8 shows how it works. A pulse on SYNC_Y resets the
crossbar switch. The initial state after reset of the switchboard
is read from the SPI control register. When the automatic
toggling of the switchboard is enabled, it toggles on every
rising edge of the CLK_Y clock. Separate pins are used for the
SYNC_Y and CLK_Y signals on the crossbar logic these pins
can be connected to the SYNC_YL and CLK_YL pins of the
shift register that is used for readout.
.
SYNC_YR
CLK_YR
IBIS4-14000-M
IBIS4-14000-C
Manual
Q
Power
Power
Power
Power
Figure 8. Output Amplifier Crossbar Switch
Document #: 38-05709 Rev. *A
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