CCD Signal Processors with
Integrated Timing Driver
a
AD9848/AD9849
PRODUCT DESCRIPTION
FEATURES
The AD9848 and AD9849 are highly integrated CCD signal pro-
cessors for digital still camera applications. Both include a complete
analog front end with A/D conversion, combined with a program-
mable timing driver. The Precision Timing core allows adjustment
of high speed clocks with approximately 1 ns resolution.
AD9848: 10-Bit, 20 MHz Version
AD9849: 12-Bit, 30 MHz Version
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 20 MHz A/D Converter (AD9848)
12-Bit 30 MHz A/D Converter (AD9849)
Black Level Clamp with Variable Level Control
Complete On-Chip Timing Driver
®
The AD9848 is specified at pixel rates of 20 MHz, and the
AD9849 is specified at 30 MHz. The analog front end includes
black level clamping, CDS, PxGA, VGA, and a 10- or 12-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.
Precision Timing
™ Core with 1 ns Resolution @ 20 MSPS
On-Chip 3 V Horizontal and RG Drivers (AD9848)
On-Chip 5 V Horizontal and RG Drivers (AD9849)
48-Lead LQFP Package
Packaged in a space-saving 48-lead LQFP, the AD9848 and
AD9849 are specified over an operating temperature range of
–20°C to +85°C.
APPLICATIONS
Digital Still Cameras
FUNCTIONAL BLOCK DIAGRAM
VRT VRB
VREF
4؎6dB
2dB TO 36dB
VGA
10 OR 12
DOUT
CDS
ADC
PxGA
CCDIN
CLAMP
CLAMP
INTERNAL
CLOCKS
CLPOB
CLPDM
PBLK
CLI
RG
PRECISION
TIMINGTM
CORE
HORIZONTAL
DRIVERS
4
H1–H4
SYNC
GENERATOR
INTERNAL
REGISTERS
AD9848/AD9849
HD
VD
SL
SCK SDATA
PxGA is a registered trademark and Precision Timing is a trademark of Analog Devices, Inc.
REV. 0
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, norforanyinfringementsofpatentsorotherrightsofthirdpartiesthat
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
Fax: 781/326-8703
www.analog.com
© Analog Devices, Inc., 2001