CS7615-KQ データシートの表示（PDF） - Cirrus Logic
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CS7615-KQ Datasheet PDF : 36 Pages
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CS7615
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.
CCD
7
512x480
VERTICAL
DRIVE
+8 V TO +12 V
CS7615
CDS/ADC
TIMING I2C
9
DC-DC
CONVERTER
4:2:2, H.656 VIDEO
CS7665 or CS7666
IMAGE
PROCESSOR
I2C
CS4952 or
CS4954
2
+5 V
I2C BUS
Figure 3. Typical 4-Chip Digital CCD Camera
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.
XTAL
32 CS7615 39 CLK2x0 CLOCK 56 CS7665
4 CLK0
55
33
10-BIT DATA
Figure 4. CS7615/CS7665 Interface
NC 33 CS7615 39 NC
4 CLK0
32 XTALIN
10-BIT DATA
CS7666 56
55 CLKIN
52
CCLOKG
XTAL
Figure 5. CS7615/CS7666 Interface
6
DS231PP6
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