complete 10-bit and 12-bit, 25 mhz
ccd signal processors

ad9943/ad9944


rev. b
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: 781.326.8703 ? 2004 analog devices, inc. all rights reserved.
features
25 msps correlated double sampler (cds)
6 db to 40 db 10-bit variable gain amplifier (vga)
low noise optical black clamp circuit
preblanking function
10-bit (ad9943), 12-bit (ad9944) 25 msps a/d converter
no missing codes guaranteed
3-wire serial digital interface
3 v single-supply operation
space-saving 32-lead 5 mm × 5 mm lfcsp package

applications
digital still cameras
digital video camcorders
pc cameras
portable ccd imaging devices
cctv cameras
general description
the ad9943/ad9944 are complete analog signal processors
for ccd applications. they feature a 25 mhz single-channel
architecture designed to sample and condition the outputs of
interlaced and progressive scan area ccd arrays. the signal
chain for the ad9943/ad9944 consists of a correlated double
sampler (cds), a digitally controlled variable gain amplifier
(vga), and a black level clamp. the ad9943 offers 10-bit
adc resolution, while the ad9944 contains a true 12-bit adc.
the internal registers are programmed through a 3-wire
serial digital interface. programmable features include gain
adjustment, black level adjustment, input clock polarity, and
power-down modes. the ad9943/ad9944 operate from a
single 3 v power supply, typically dissipate 79 mw, and are
packaged in space-saving 32-lead lfcsp packages.



functional block diagram
dataclkshdshp
band gap
reference
doutccdin
pblkreft refb
internal
timing
6db–40db
avdd
dvdd
dvss
avss
drvdd
drvss
10
digital
interface
sdatascksl
clpob
10/12
cds vga
clp
ad9943/ad9944
control
registers
10-/12-bit
adc
02905-b
-
001

figure 1. functional block diagram
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