14-Bit CCD Signal Processor with V-Driver
and Precision TimingTM Generator
AD9927
FEATURES
GENERAL DESCRIPTION
Integrated 18-channel V-driver
1.8 V AFETG core
Internal LDO regulator and charge pump circuitry
Compatibility with 3 V or 1.8 V systems
24 programmable vertical clock signals
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
Complete on-chip timing generator
The AD9927 is a highly integrated CCD signal processor for
digital still camera applications. It includes a complete analog
front end with A/D conversion, combined with a full-function
programmable timing generator and 18-channel vertical driver
(V-driver). The timing generator is capable of supporting up to
24 vertical clock signals to control advanced CCDs. The on-
chip V-driver supports up to 18 channels for use with 5-field
CCDs. A Precision Timing core allows adjustment of high speed
clocks with approximately 400 ps resolution at 40 MHz
operation. The AD9927 also contains eight general-purpose
outputs, which can be used for shutter and system functions.
Precision Timing core with ~400 ps resolution
On-chip 3 V horizontal and RG drivers
General-purpose outputs (GPOs) for shutter and
system support
The 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.
On-chip driver for external crystal
On-chip sync generator with external sync input
128-lead CSP_BGA package, 9 mm × 9 mm, 0.65 mm pitch
The AD9927 is specified over an operating temperature range
of –25°C to +85°C.
APPLICATIONS
Digital still cameras
FUNCTIONAL BLOCK DIAGRAM
REFT REFB
AD9927
–3dB, 0dB, +3dB, +6dB
CDS
VREF
14
14-BIT
ADC
VGA
CCDIN
DOUT
6dB TO 42dB
CLAMP
3V INPUT
LDO
REG
1.8V OUTPUT
1.8V INPUT
3V OUTPUT
CHARGE
PUMP
INTERNAL CLOCKS
RG
HL
PRECISION
TIMING
HORIZONTAL
SL
DRIVERS
GENERATOR
8
INTERNAL
REGISTERS
SCK
SDATA
H1 TO H8
XV1 TO XV24
24
18
V1A-V6 (3-LEVEL)
V7-V15 (2-LEVEL)
VERTICAL
VERTICAL
DRIVER
SYNC
GENERATOR
TIMING
CONTROL
SUBCK
8
XSUBCK
XSUBCNT
GP01 TO GP08
HD
VD SYNC CLI CLO
RSTB
Figure 1.
Rev. 0
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