AD9802_15 Datasheet, PDF (1/20 Pages) Analog Devices – CCD Signal Processor For Electronic Cameras

a
CCD Signal Processor
For Electronic Cameras
AD9802
FEATURES
FUNCTIONAL BLOCK DIAGRAM
10-Bit, 18 MSPS A/D Converter
18 MSPS Full Speed Correlated Double Sampler (CDS)
PBLK CLPDM PGACONT1 PGACONT2 SHP SHD ADCCLK
Low Noise, Wideband PGA
Internal Voltage Reference
No Missing Codes Guaranteed
CLAMP
TIMING
GENERATOR
+3 V Single Supply Operation
PIN
CDS
PGA
OBSOLETE LowPowerCMOS: 185mW
48-Terminal TQFP Package
DIN
ADCIN
REFERENCE
MUX S/H
10
A/D
DOUT
CLAMP
AD9802
DRVDD
DVDD
CMLEVEL VRT VRB STBY CLPOB ADCMODE ACVDD ADVDD
PRODUCT DESCRIPTION
The AD9802 is a complete CCD signal processor developed
for electronic cameras. It is suitable for both camcorder 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 cir-
cuitry and an onboard voltage reference are provided as well as a
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 AD9802 includes a low-noise, wideband amplifier with
direct ADC input. The AD9802 operates from a single +3 V
analog variable gain from 0 dB to 31.5 dB (linear in dB).
supply with a typical power consumption of 185 mW.
3. Direct ADC Input
The AD9802 is packaged in a space saving 48-terminal thin
A direct input to the 10-bit A/D converter is provided for
quad flatpack (TQFP) and is specified over an operating tem-
digitizing video signals.
perature range of 0°C to +70°C.
4. 10-Bit, High Speed A/D Converter
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.
5. Low Power
At 185 mW, and 15 mW in power-down, the AD9802 con-
sumes a fraction of the power of presently available multichip
solutions.
6. Digital I/O Functionality
The AD9802 offers three-state digital output control.
7. Small Package
Packaged in a 48-terminal, surface-mount thin quad flatpack,
the AD9802 is well suited to very compact, low headroom
designs.
REV. 0
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© Analog Devices, Inc., 1997