AD AD9920A

12-Bit CCD Signal Processor with V-Driver
and Precision Timing Generator
AD9920A
FEATURES
GENERAL DESCRIPTION
Integrated 19-channel V-driver
1.8 V AFETG core
24 programmable vertical clock signals
Correlated double sampler (CDS) with −3 dB, 0 dB,
+3 dB, and +6 dB gain
12-bit, 40.5 MHz analog-to-digital converter (ADC)
Black level clamp with variable level control
Complete on-chip timing generator
Precision Timing core with ~400 ps resolution
On-chip 3 V horizontal and RG drivers
General-purpose outputs (GPOs) for shutter and
system support
On-chip sync generator with external sync input
On-chip 1.8 V low dropout (LDO)
105-lead 8 mm × 8 mm CSP_BGA package
The AD9920A is a highly integrated charge-coupled device (CCD)
signal processor for digital still camera applications. It includes a
complete analog front end (AFE) with analog-to-digital conversion,
combined with a full-function programmable timing generator
and 19-channel vertical driver (V-driver). The timing generator
is capable of supporting up to 26 vertical clock signals to control
advanced CCDs. The on-chip V-driver supports up to 19 channels
for use with 6-field CCDs. A Precision Timing™ core allows adjustment of high speed clocks with approximately 400 ps resolution
at 40.5 MHz operation. The AD9920A also contains six GPOs
that can be used for shutter and system functions.
The analog front end includes black level clamping, variable
gain CDS, and a 12-bit ADC. The timing generator provides all
the necessary CCD clocks: RG, H-clocks, V-clocks, sensor gate
pulses, substrate clock, and substrate bias control.
APPLICATIONS
The AD9920A is specified over an operating temperature range
of −25°C to +85°C.
Digital still cameras
FUNCTIONAL BLOCK DIAGRAM
REFT REFB
AD9920A
–3dB, 0dB, +3dB, +6dB
CDS
CCDIN
VREF
12-BIT
ADC
VGA
12
DOUT
6dB TO 42dB
CLAMP
3V INPUT
DCLK
LDO
REG
1.8V OUTPUT
INTERNAL CLOCKS
RG
8
PRECISION
TIMING
GENERATOR
HORIZONTAL
DRIVERS
SL
INTERNAL
REGISTERS
H1 TO H8
XV1 TO XV24
V1A TO V6 (3-LEVEL)
V7 TO V15 (2-LEVEL)
SDATA
19
VERTICAL
DRIVER
SUBCK
VERTICAL
TIMING
CONTROL
24
GPO5
GPO6
XSUBCK
XSUBCNT
SCK
SYNC
GENERATOR
6
HD
GPO1 TO GPO4,
GPO7, GPO8
VD
CLI
CLO
SYNC/RSTB
06878-001
HL
Figure 1.
For more information about the AD9920A, contact Analog Devices via email at [email protected]
Rev. Sp0
Information furnished by Analog Devices is believed to be accurate and reliable. However, no
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other
rights of third parties that may result from its use. Specifications subject to change without notice. No
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Trademarks and registered trademarks are the property of their respective owners.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781.329.4700
www.analog.com
Fax: 781.461.3113
©2007 Analog Devices, Inc. All rights reserved.
AD9920A
NOTES
©2007 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06878F-0-7/07(Sp0)
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