Dual-Channel, 14-Bit CCD Signal
Processor with Precision Timing Core
AD9978
FEATURES GENERAL DESCRIPTION
Dual AFE channels The AD9978 is a highly integrated, dual-channel CCD signal
1.8 V analog and digital core supply voltage
processor for high speed digital video camera applications. Each
Serial data output with reduced range LVDS outputs
channel is specified at pixel rates of up to 65 MHz and consists of
Differential analog inputs
a complete analog front end with ADC conversion. The Precision
CDS or SHA configuration (CDS bypass) with
Timing core allows adjustment of the correlated double sampler
3 dB, 0 dB, +3 dB, and +6 dB gain
(CDS) and sample-and-hold amplifier (SHA) clocks with 240 ps
6 dB to 42 dB, 10-bit variable gain amplifier (VGA)
resolution at 65 MHz operation. The AD9978 also contains a
14-bit, 65 MHz analog-to-digital converter (ADC)
reduced range, low voltage differential signaling (LVDS) interface
Black level clamp with variable level control
for the dual-channel data outputs.
Precision Timing core with 240 ps resolution @ 65 MHz
Each analog front end includes black level clamping, a CDS,
a VGA, and a 65 MHz, 14-bit ADC. Operation is programmed
APPLICATIONS
using a 3-wire serial interface.
Digital video cameras
Digital still cameras Packaged in a space-saving, 6 mm 6 mm, 40-lead LFCSP, the
Digital copiers AD9978 is specified over an operating temperature range of
Multifunction printers 25C to +85C.
High speed industrial cameras
FUNCTIONAL BLOCK DIAGRAM
AD9978
VREF
6dB TO 42dB
INP_A
DOUT0P
CDS/
VGA ADC
DOUT0N
SHA
INM_A
DOUT1P
DOUT1N
3dB, 0dB, +3dB, +6dB
CLAMP
LVDS TCLKP
SERIALIZER TCLKN
3dB, 0dB, +3dB, +6dB CLAMP
DOUT2P
6dB TO 42dB DOUT2N
INP_B
DOUT3P
CDS/
VGA ADC
DOUT3N
SHA
INM_B
INTERNAL CLOCKS
PRECISION
CLK_OUT TIMING CLI
CORE
SYNC INTERNAL
GENERATOR REGISTERS
HD VD SL SDATA SCK
Figure 1.
For more information about the AD9978, contact Analog Devices via email at afe.ccd@analog.com.
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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
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
rights of third parties that may result from its use. Specifications subject to change without notice. No
Tel: 781.329.4700 www.analog.com
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.
Fax: 781.461.3113 20072008 Analog Devices, Inc. All rights reserved.
Trademarks and registered trademarks are the property of their respective owners.
06810-001AD9978
NOTES
2008 Analog Devices, Inc. All rights reserved. Trademarks and
registered trademarks are the property of their respective owners.
D06810F-0-9/08(SpB)
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