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XRD9856 Datasheet

  • XRD9856

  • CCD Image Digitizers with CDS, PGA and 10-Bit A/D

  • 683.47KB

  • 35頁

  • EXAR   EXAR

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XRD9855/9856
XRD98L55/98L56
CCD Image Digitizers with
CDS, PGA and 10-Bit A/D
July 2001
FEATURES
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10-Bit Resolution ADC
18 - 27MHz Maximum Sampling Rate
Correlated Double Sampling (CDS)
Programmable Gain from 6dB to 38dB (PGA)
Digitally Controlled Analog Offset-Calibration
CCD Black Level Offset Compensation at Frame
Rate
CDS Clocks Sample Rising Edge or Falling Edge
Single 5V or 3V Power Supply
Low Power for Battery Applications:
XRD9855/56:
XRD98L55/L56:
250/
300m W @ V
DD
= 5.0V
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3-State Digital Outputs
ESD Protection to Over 2000V
APPLICATIONS
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Digital Video Camcorders
Digital Still Cameras
PC Video Teleconferencing
Digital Copiers
Infrared Image Digitizers
CCD/CIS Imager Interface
CCTV/Security Camera
2D Bar Code Readers
Industrial Cameras
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120/150mW @ V
DD
= 3.0V
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50
碌
A-Typ Current in Stand By Mode
GENERAL DESCRIPTION
The XRD9855/XRD9856 are complete CCD Image
Digitizers for digital cameras. The products include a
high bandwidth differential Correlated Double Sampler
(CDS), 8-bit digitally Programmable Gain Amplifier
(PGA), 10-bit Analog-to-Digital Converter (ADC) and
digital controlled black level auto-calibration circuitry.
The C or el ed D oubl Sam pl ( D S ) subt act t
r at
e
er C
r s he
C C D out
put si
gnal bl
ack l
evel fom t vi
r
he deo l
evel
.
C om m on m ode si
gnal se and pow ersuppl noi ar
noi
y se e
r ect by t dif ental D S i
ej ed
he fer i C
nputst
age.C D S i
nput
s
ar desi
e
gned t be used eiher dif entalor si e-
o
t
fer i
ngl
ended.
The aut calbr i cicui com pensat f any i er
o
i aton r t
es or
nt -
nalofsetoft X R D 9855/ R D 9856 as w el as bl
f
he
X
l
ack
l
evelofsetf om t C C D .
f
r
he
The PGA is digitally controlled with 8-bit resolution on
a linear dB scale, resulting in a gain range of 6dB to
38dB with 0.125dB per LSB of the gain code.
The PGA and black level auto-calibration are controlled
through a simple 3-wire serial interface. The timing
circuitry is designed to enable users to select a wide
variety of available CCD and image sensors for their
applications.
The XRD9855/XRD9856 has direct access to the PGA
output and ADC input through the pin TESTVIN.
The XRD9855/XRD9856 are packaged in 48-lead sur-
face mount TQFP to reduce space and weight, and
suitable for hand-held and portable applications.
ORDERING INFORMATION
Part No.
XRD9855AIV
XRD98L55AIV
XRD9856AIV
XRD98L56AIV
Package
48 Lead TQFP (7 x 7 x 1.4 mm)
48 Lead TQFP (7 x 7 x 1.4 mm)
48 Lead TQFP (7 x 7 x 1.4 mm)
48 Lead TQFP (7 x 7 x 1.4 mm)
Operating
Temperature Range Power Supply
-40擄C to 85擄C
-40擄C to 85擄C
-40擄C to 85擄C
-40擄C to 85擄C
5.0V
3.0V
5.0V
3.0V
Maximum
Sampling Rate
18 MSPS
18 MSPS
27 MSPS
27 MSPS
Rev. 1.01
EXAR
Corporation, 48720 Kato Road, Fremont, CA 94538
鈥?/div>
(510) 668-7000
鈥?/div>
FAX (510) 668-7017
鈥?/div>
www.exar.com

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