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
processor for high speed digital video camera applications. Each
channel is specified at pixel rates of up to 65 MHz and consists of
a complete analog front end with ADC conversion. The Precision
Timing™ core allows adjustment of the correlated double sampler
(CDS) and sample-and-hold amplifier (SHA) clocks with 240 ps
resolution at 65 MHz operation. The AD9978 also contains a
reduced range, low voltage differential signaling (LVDS) interface
for the dual-channel data outputs.
1.8 V analog and digital core supply voltage
Serial data output with reduced range LVDS outputs
Differential analog inputs
CDS or SHA configuration (CDS bypass) with
−3 dB, 0 dB, +3 dB, and +6 dB gain
6 dB to 42 dB, 10-bit variable gain amplifier (VGA)
14-bit, 65 MHz analog-to-digital converter (ADC)
Black level clamp with variable level control
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
using a 3-wire serial interface.
APPLICATIONS
Digital video cameras
Digital still cameras
Digital copiers
Multifunction printers
High speed industrial cameras
Packaged in a space-saving, 6 mm × 6 mm, 40-lead LFCSP, the
AD9978 is specified over an operating temperature range of
−25°C to +85°C.
FUNCTIONAL BLOCK DIAGRAM
AD9978
VREF
6dB TO 42dB
INP_A
INM_A
DOUT0P
DOUT0N
DOUT1P
DOUT1N
TCLKP
CDS/
SHA
ADC
VGA
–3dB, 0dB, +3dB, +6dB
–3dB, 0dB, +3dB, +6dB
CLAMP
CLAMP
LVDS
SERIALIZER
TCLKN
DOUT2P
DOUT2N
DOUT3P
DOUT3N
6dB TO 42dB
INP_B
INM_B
CDS/
VGA
ADC
SHA
INTERNAL CLOCKS
PRECISION
TIMING
CLK_OUT
CLI
CORE
SYNC
INTERNAL
GENERATOR
REGISTERS
SCK
SDATA
HD
VD
SL
Figure 1.
For more information about the AD9978, contact Analog Devices via email at afe.ccd@analog.com.
Rev. SpB
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rights of third parties that may result from its use. Specifications subject to change without notice. No
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