CS7615 datasheet(6/36 Pages) CIRRUS

6 / 36 page

CS7615

DS231PP6

GENERAL DESCRIPTION

Overview

The CS7615 performs the analog functions in a

four chip digital CCD Camera. The four main chips

include the CCD imager, the CS7615 CCD digitiz-

er, the CS7665 or CS7666 color space processor,

and a vertical drive interface-chip for the CCD im-

ager. Several CCD imagers (and their associated

vertical drivers) can be used with the CS7615 digi-

tizer and the CS7665 or CS7666 processor to form

a simple and cost-effective YCrCb output format

digital camera. The block diagram in Figure 3 illus-

trates the system interconnect.

Interfacing the CS7615 with CS7665 or

CS7666

The CS7666 is a direct replacement for the

CS7665. No board or software changes are needed

for existing designs. However, slight changes to

existing hardware and software are necessary to

take advantage of the CS7666. See Figure 4 and 5

and the CS7666 data sheet for more details.

Operation

The CS7615 digitizer is designed to provide all

necessary analog functions and conversion to digi-

tal data of a standard CCD imager output signal as

well as provide all the timing and control signals

for the CCD imager. The architecture includes a

correlated double sampler, variable gain amplifier

with an integrated AGC loop, black level clamp,

10-bit A/D converter, output formatter, and a com-

plete multi-sync CCD timing generator. The output

of the A/D converter ranges from code 004h to

code 3FBh and the formatter adds special end-of-

active-video

(EAV)

and

start-of-active-video

(SAV) codes to each line, making the output of the

CS7615 similar to the description in the ITU-656

recommendation.

CCD

CDS/ADC

IMAGE

PROCESSOR

TIMING

I C

+5 V

+8 V TO +12 V

DC-DC

CONVERTER

CS7615

CS7665 or CS7666

4:2:2, H.656 VIDEO

I C BUS

VERTICAL

DRIVE

512x480

CS4952 or

CS4954

Figure 3. Typical 4-Chip Digital CCD Camera

XTAL

CS7615

CS7665

CLK2x0 CLOCK

CLK0

10-BIT DATA

Figure 4. CS7615/CS7665 Interface

XTAL

32 XTALIN

CS7615

CS7666

CLK0

10-BIT DATA

55 CLKIN

CCLOKG

Figure 5. CS7615/CS7666 Interface

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