LM9822 3 Channel 42-Bit Color Scanner Analog Front End
May 1999
N
General Description
LM9822 3 Channel 42-Bit Color Scanner Analog Front End
The LM9822 is a high performance Analog Front End (AFE) for
image sensor processing systems. It performs all the analog and
mixed signal functions (correlated double sampling, color spe-
cific gain and offset correction, and analog to digital conversion)
necessary to digitize the output of a wide variety of CIS and
CCD sensors. The LM9822 has a 14 bit 6MHz ADC.
Key Specifications
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Output Data Resolution
Pixel Conversion Rate
Analog Supply Voltage
I/O Supply Voltage
Power Dissipation (typical)
14 Bits
6MHz
5V鹵5%
3.3V鹵10% or 5V鹵5%
375mW
Features
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6 million pixels/s conversion rate
Digitally programmed gain and offset for red, green and blue
color balancing
Correlated Double Sampling for lowest noise from CCD
sensors
Compatible with CCD and CIS type image sensors
Internal Voltage Reference Generation
TTL/CMOS compatible input/output
Applications
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Color Flatbed Document Scanners
Color Sheetfed Scanners
Multifunction Imaging Products
Digital Copiers
General Purpose Linear Array Imaging
Connection Diagram
V
BANDGAP
V
REFMID
V
A
AGND
OS
R
V
REF+
OS
G
V
REF-
OS
B
V
A
AGND
SEN
SDI
SDO
1
2
3
4
5
6
7
8
9
10
11
12
13
14
LM9822
28 pin
SOIC
28
27
26
25
24
23
22
21
20
19
18
17
16
15
D7
D6
D5
D4
D3
D2
D1
D0
V
D
DGND
CLMP
VSMP
MCLK
SCLK
Ordering Information
Temperature Range
0擄C
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T
A
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+70擄C
Order Number
LM9822CCWM
1
LM9822CCWMX
2
Device Marking
LM9822CCWM
LM9822CCWM
M28B
M28B
NS Package
Number
Notes:
1
- Rail transport media, 26 parts per rail,
2
- Tape and reel transport media, 1000 parts per reel
TRI-STATE廬 is a registered trademark of National Semiconductor Corporation.
漏1999 National Semiconductor Corporation
1
www.national.com
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