Data Sheet

Figure 5 shows the pictorial layout of the controls and the tests points. These adjustment potentiometers and the test points are shown

relative to the connector and to the output pads for LED light power. This is a bird’s eye view of the PCB’s backside with the glass

window of the module facing down on the documents.

The test point labeled TV is for the analog image pixels, just as it is produced at the output of the CIS array section and prior to its entry

into the tracking digitizer circuit.

The test point labeled TR is the output of the tracking reference level from the tracking digitizer circuit.

The test point labeled TVD is the digital output from the comparator.

Offset adjust, R18, is a screw driver adjustment potentiometer that is accessed through adjustment hole as viewed in Figure 5.

Gain adjust, R16, is a screw driver adjustment potentiometer that is accessed through the hole as it is viewed in Figure 5.

8.3.2. There Are Only Two Adjustments

These adjustments will be pre-adjusted to the customer’s specific application at the factory; therefore in general, further adjustments will

not be required by the user. Test point TV is probed with a scope to monitor the analog image pixel levels. The probe should be

grounded as close to the CIS module as possible. If possible, the probe should be placed right on the ground input lead, Pin 5, of the

I/O connector.

Analog zero signal adjust (OFFSET ADJ) is shown in Figure 5. This potentiometer is adjusted to place the dark level of the analog

image pixel signal to approximately –0.9 to –0.7V. Normally, this is adjusted with intended targets.

Analog gain adjust, “GAIN”, is adjusted greater than 2.0 and less than 3.5V with the CIS imaged on a standard white target, similar to

the standard white copy or typing paper.

8

AMI Semiconductor – May 06, M-20566-001

www.amis.com