CYIL1SM4000AA_09 Datasheet, PDF (9/31 Pages) Cypress Semiconductor – 4 MegaPixel CMOS Image Sensor

Setting the ADC Reference Voltages
Figure 9. Internal and External ADC Connections
2.5V
RHIGH_ADC
REF_HIGH ~ 2 V
R_ADC
external
internal
REF_LOW ~ 1 V
external
RLOW_ADC
CYIL1SM4000AA
The internal resistor R_ADC has a value of approximately 300Ω. This value of this resistor is not tested at sort or at final test. Tweaking
may be required as the recommended resistors in Figure 9 are determined by trade-off between speed and power consumption.
Resistor
R_{ADC_VHIGH}
R_ADC
R_{ADC_VLOW}
Typical Value (Ω)
75
300
220
Synchronous Shutter
In a synchronous (snapshot) shutter, light integration takes place on all pixels in parallel although subsequent readout is sequential.
Figure 10. Synchronous Shutter Operation
Line number
Integration time
Time axis
Burst Readout time
Figure 10 shows the integration and read out sequence for the
synchronous shutter. All pixels are light sensitive at the same
period of time. The whole pixel core is reset simultaneously and
after the integration time all pixel values are sampled together on
the storage node inside each pixel. The pixel core is read out line
by line after integration. Note that the integration and read out
cycle can occur in parallel or in sequential mode (see Timing and
Readout of Image Sensor on page 13).
Document Number: 38-05712 Rev. *C
Page 9 of 31
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