AD AD9928

Dual Channel 14-Bit CCD Signal Processor
with V-Driver and Precision Timing Generator
AD9928
FEATURES
GENERAL DESCRIPTION
Registers similar to AD9920A and AD9990
Timing generator with 18-channel V-driver
Serial data output with reduced range LVDS interface
1.8 V dual AFE core
Internal LDO regulators for compatibility with 3 V systems
Correlated double sampler (CDS) with −3 dB, 0 dB,
+3 dB, and +6 dB gain
6 dB to 42 dB, 10-bit variable gain amplifier (VGA)
14-bit, 40 MHz analog-to-digital converter (ADC)
Black level clamp with variable level control
Precision Timing core with ~390 ps resolution at 40 MHz
On-chip 3 V horizontal and RG drivers
General-purpose outputs (GPOs) for shutter support
On-chip driver for external crystal
128-ball CSP_BGA package, 9 mm × 9 mm, 0.65 mm pitch
The AD9928 is a highly integrated CCD signal processor for
digital still camera applications. It includes a dual analog front
end with analog-to-digital conversion, combined with a fullfunction programmable timing generator and 18-channel
vertical driver (V-driver) for a 2-channel output CCD. The
timing generator is capable of supporting up to 24 vertical clock
signals internally, and the on-chip V-driver supports up to 18
high voltage outputs. A Precision Timing™ core allows adjustment
of high speed clocks with approximately 390 ps resolution at
40 MHz operation. The AD9928 also contains eight generalpurpose outputs, which can be used for shutter and system
functions.
Each analog front end includes black level clamping, CDS,
VGA, and a 14-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
Digital still cameras
Medical imaging
Industrial cameras
The AD9928 is specified over an operating temperature range
of –25°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
REFT_A REFB_A
REFT_B REFB_B
VREF_A
VREF_B
AD9928
–3dB, 0dB, +3dB, +6dB
CDS
CCDIN_A
14-BIT
ADC
VGA
TCLKP
14
TCLKN
DOUT0P_A
6dB TO 42dB
–3dB, 0dB, +3dB, +6dB
CDS
CCDIN_B
LDO_IN
LDO_OUT
LDO_IN
LDO_OUT
14-BIT
ADC
VGA
14
+1.8V
LDO
REG_A
+3V
+1.8V
LDO
REG_B
6dB TO 42dB
8
DOUT1N_A
DOUT0P_B
DOUT1N_B
INTERNAL CLOCKS
PRECISION
TIMING
GENERATOR
HORIZONTAL
DRIVERS
H1A TO H4A, H1B TO H4B
SL
INTERNAL
REGISTERS
XV1 TO XV24
24
18
SUBCK
DOUT1P_A
DOUT1P_B
CLAMP
2
HL_A, HL_B
V1A TO V15
REDUCED
RANGE
LVDS
OUTPUTS
DOUT0N_B
+3V
RG_A, RG_B
DOUT0N_A
CLAMP
VERTICAL
DRIVER
XSUBCK
SCK
SDI
VERTICAL
TIMING
CONTROL
SYNC
GENERATOR
GPO1 TO GPO7
HD
VD SYNC CLI
CLO
RST
08261-001
7
XSUBCNT (GPO8)
Figure 1.
For more information on the AD9928, email Analog Devices, Inc., at [email protected].
Rev. SpD
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
©2009 Analog Devices, Inc. All rights reserved.
AD9928
NOTES
©2009 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D08261F-0-10/09(SpD)
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