AD9801_15 Datasheet, PDF (1/12 Pages) Analog Devices – CCD Signal Processor For Electronic Cameras

a
CCD Signal Processor
For Electronic Cameras
AD9801
FEATURES
FUNCTIONAL BLOCK DIAGRAM
10-Bit, 18 MSPS A/D Converter
18 MSPS Full-Speed CDS
PBLK CLPDM PGACONT1 PGACONT2 SHP SHD ADCCLK
Low Noise, Wideband PGA
19
23
29
30
21 22 16
Internal Voltage Reference
No Missing Codes Guaranteed
CLAMP
TIMING
GENERATOR
+3 V Single Supply Operation
PIN 27
CDS
PGA
S/H
A/D
10 ²
DOUT
OBSOLETE Low Power CMOS: 185 mW
48-Pin TQFP Package
DIN 26
11
REFERENCE
CLAMP
AD9801 ¹² DRVDD
37
48 47 18
CMLEVEL VRT VRB STBY
20
33
43
CLPOB ACVDD ADVDD
17
DVDD
PRODUCT DESCRIPTION
The AD9801 is a complete CCD signal processor developed for
electronic cameras. It is well suited for both video conferencing
and consumer level still camera applications.
The signal processing chain is comprised of a high speed CDS,
variable gain PGA and 10-bit ADC. Required clamping
circuitry and an onboard voltage reference are also provided.
PRODUCT HIGHLIGHTS
1. On-Chip Input Clamp and CDS
Clamp circuitry and high speed correlated double sampler
allow for simple ac coupling to interface a CCD sensor at full
18 MSPS conversion rate.
2. On-Chip PGA
The AD9801 includes a low noise, wideband amplifier with
The AD9801 operates from a single +3 V supply with a typical
analog variable gain from 0 dB to 31.5 dB (linear in dB).
power consumption of 185 mW.
3. 10-Bit, High Speed A/D Converter
The AD9801 is packaged in a space saving 48-pin thin-quad
flatpack (TQFP) and is specified over an operating temperature
range of 0°C to +70°C.
A linear 10-bit ADC is capable of digitizing CCD signals at
the full 18 MSPS conversion rate. (Typical DNL is ± 0.5 LSB
and no missing code performance is guaranteed.)
4. Low Power
At 185 mW, the AD9801 consumes a fraction of the power of
presently available multichip solutions. The part’s power-
down mode (15 mW) further enhances its desirability in low
power, battery operated applications.
5. Digital I/O Functionality
The AD9801 offers three-state digital output control.
6. Small Package
Packaged in a 48-pin, surface-mount thin-quad flatpack, the
AD9801 is well suited to very tight, low headroom designs.
REV. 0
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© Analog Devices, Inc., 1997