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Wolfson Microelectronics - Integrated 12-bit Data Acquisition System

Numéro de référence WM8144-12
Description Integrated 12-bit Data Acquisition System
Fabricant Wolfson Microelectronics 
Logo Wolfson Microelectronics 





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WM8144-12 fiche technique
WM8144-12
Production Data
February 1998 Rev. 4.1
Integrated 12-bit Data Acquisition System for
Imaging Applications
Description
Features
WM8144-12 integrates the analogue signal conditioning
required by CCD sensors with a 12-bit ADC and optional
pixel-by-pixel image compensation. WM8144-12 requires
minimal external circuitry and provides a cost effective
sensor-to-digital domain system solution.
Each analogue conditioning channel provides reset level
clamp, CDS, fine offset level shifting and gain
amplification. The three channels are multiplexed into the
ADC. Output from the ADC can either be direct or passed
through a digital post-processing function. The post-
processing provides compensation for variations in offset
and shading on a pixel-by-pixel basis.
• Reset level clamp
• Correlated Double Sampling (CDS)
• Fine offset level shifting
• Programmable Gain Amplification
• 12-Bit ADC with maximum 4 MSPS
• Digital post-processing for pixel-by-pixel
image compensation
• Simple clocking scheme
• Control by serial or parallel interface
• Time-multiplexed eight-bit data output mode
• 48 pin TQFP package
• Pin compatible with WM8144-10
The flexible output architecture allows twelve-bit data to
be accessed either on a twelve-bit bus or via a time-
multiplexed eight-bit bus. The WM8144-12 can be
configured for pixel-by-pixel or line-by-line multiplexing
operation. Reset level clamp and/or CDS features can be
optionally bypassed. Device configuration is either by a
simple serial or eight-bit parallel interface.
Applications
• Document scanners
• CCD sensor interfaces
• Contact image sensor (CIS) interfaces
Block Diagram
VRLC
VRU VRT
VRB VRL
VMID
VSMP MCLK RLC
AVDD AGND DVDD1 DVDD2 DGND
VMID
RINP
GINP
BINP
MUX
CL RS VS
S/H
S/H
PGA
CDS
5-BIT REG
S/H
S/H
PGA
CDS
5-BIT REG
S/H
S/H
PGA
CDS
5-BIT REG
TIMING CONTROL
OFFSET
8-BIT + SIGN
DAC
VMID
OFFSET
8-BIT + SIGN
DAC
VMID
OFFSET
8-BIT + SIGN
DAC
VMID
WM8144-12
EXTERNAL
DATA STORE
INTERFACE
M
U
X
12 BIT
ADC
IMAGE
COMPENSATION
PROCESSING
12/8
MUX
CONFIGURABLE
SERIAL/PARALLEL
CONTROL INTERFACE
CC[2:0]
DV
CDATA(7:0)
ORNG
OEB
OP[11:0]
PNS
SDI / DNA
SCK / RNW
SEN / STB
NRESET
Production Data data sheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics standard terms and condi-
tions.
Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh EH8 9NX, UK
Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176
www: http://www.wolfson.co.uk
© 1998 Wolfson Microelectronics
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