CS7615 View Datasheet(PDF) - Cirrus Logic

Part Name

Description

Manufacturer

CS7615

CCD Imager Analog Processor

Cirrus Logic 

HREF

CS7615

V1f

V1r

V1X

V2f

V2r

V2X

V3X

V3f

V3r

V4X

V4f

V4r

Figure 10. Vertical Shift Register Signal Timings

Flickerless Mode: Restricts the shutter speed to

only flickerless values for the given system and

environment. If the scene is too bright, the

AGC loop will select exposure settings shorter

than the flickerless modes.

PAL Environment: Selects PAL or NTSC envi-

ronment.

Target Value: Adjusts the brightness threshold.

A lower target results in the loop settling to a

lower gain.

Max Gain: Sets a maximum gain value that will

not be exceeded even if the target brightness

has not been met.

Slew: Controls the rate of decay of the gain as

the AGC loop slews because of light intensity

variation.

Speed: Controls the overall loop gain and thus

speed of gain correction.

Min Gain: Sets the minimum on-chip gain al-

lowed. This value should be used if the satura-

tion voltage is less than 1.6V.

Correlated Double Sampling (CDS)

Correlated Double Sampling, as applied to CCD-

based imaging systems, is a method used to remove

low-frequency noise from the output of a CCD im-

ager leaving only the signal of interest. The CDS is

applied prior to amplification by the VGA.

DS231PP6

11

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