REV. A
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a
AD9847
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700 www.analog.com
Fax: 781/326-8703 © 2003 Analog Devices, Inc.
10-Bit 40 MSPS CCD Signal Processor
with Integrated Timing Driver
FUNCTIONAL BLOCK DIAGRAM
CLAMP
DOUT
CCDIN
PBLK
VRT
VRB
INTERNAL
REGISTERS
2dB TO 36dB
SYNC
GENERATOR
SDATASCK
SL
CLPOB
10
VGA
AD9847
4 6dB
PRECISION
TIMING
CORE
ADC
VREF
CLAMP
INTERNAL
CLOCKS
PxGA
CDS
HORIZONTAL
DRIVERS
4
RG
H1–H4
HD VD
CLI
CLPDM
GENERAL DESCRIPTION
The AD9847 is a highly integrated CCD signal processor for
digital still camera applications. The AD9847 includes a com-
plete analog front end with A/D conversion, combined with
a programmable timing driver. The Precision Timing core allows
adjustment of high speed clocks with approximately 500 ps
resolution at clock speeds of 40 MHz.
The AD9847 is specified at pixel rates of 40 MHz. The analog
front end includes black level clamping, CDS, PxGA, VGA, and a
10-bit A/D converter. The timing driver provides the high speed
CCD clock drivers for RG and H1–H4. Operation is programmed
using a 3-wire serial interface.
Packaged in a space-saving 48-lead LQFP, the AD9847 is speci-
fied over an operating temperature range of –20°C to +85°C.
FEATURES
Correlated Double Sampler (CDS)
–2 dB to +10 dB Pixel Gain Amplifier (
PxGA
®
)
2 dB to 36 dB 10-Bit Variable Gain Amplifier (VGA)
10-Bit 40 MHz A/D Converter
Black Level Clamp with Variable Level Control
Complete On-Chip Timing Driver
Precision Timing
™ Core with 500 ps
Resolution at 40 MSPS
On-Chip 5 V Horizontal and RG Drivers
48-Lead LQFP Package
APPLICATIONS
Digital Still Cameras
