WM8143-10
10-bit/6MSPS CCD Signal Processor
Production Data June 1998 Rev 3f
Description
The WM8143-10 integrates the analogue signal
conditioning required by CCD sensors with a 10-bit ADC.
The WM8143-10 requires minimal external circuitry and
provides a cost-effective sensor to digital domain system
solution.
Each of the three analogue conditioning channels
includes reset level clamp, CDS, fine offset level shifting
and programmable gain amplification. The three channels
are multiplexed into the ADC. The output from the ADC is
fed to the output bus pins OP[9:0] via a 10/8 bit
multiplexer, enabled by the OEB signal.
The flexible output architecture allows ten-bit data to be
accessed either on a ten-bit bus or via a time-multiplexed
eight-bit bus. The WM8143-10 can be configured for
pixel-by-pixel or line-by-line multiplexing operation. Reset
level clamp and/or CDS features can be optionally
bypassed. The device configuration is programmed either
via a simple serial interface or via an eight-bit parallel
interface.
The serial/parallel interfaces of the WM8143-10 are
control compatible with those of the WM8144-10 and
WM8144-12.
Features
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•
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Reset level clamp
Correlated double sampling (CDS)
Fine offset level shifting
Programmable gain amplification
10-bit ADC with maximum 6 MSPS
Simple clocking scheme
Control by serial or parallel interface
Time multiplexed eight-bit data output mode
32 pin TQFP package
Interface compatible with WM8144-10 and
WM8144-12
Applications
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Flatbed scanners
Sheet feed scanners
Film scanners
CCD sensor interfaces
Contact image sensor (CIS) interfaces
Block Diagram
VRLC
VRU
VRT
VRB
VMID
VSMP
MCLK
RLC
AGND
DGND
DVDD
AVDD
MUX
TIMING CONTROL
CL
VMID
RS
VS
OFFSET
RINP
S/H
CDS
5-BIT REG
8-BIT +
SIGN DAC
S/H
PGA
+
+
WM8143-10
VMID
OFFSET
GINP
S/H
CDS
S/H
PGA
+
+
M
U
X
OEB
10-bit
ADC
10/8
MUX
OP[9:0]
5-BIT REG
8-BIT +
SIGN DAC
VMID
OFFSET
BINP
S/H
CDS
5-BIT REG
8-BIT +
SIGN DAC
CONFIGURABLE
SERIAL/PARALLEL
CONTROL INTERFACE
SDI / DNA
SCK / RNW
SEN / STB
NRESET
S/H
PGA
+
+
VMID
Production Data
datasheets
contain final specifications current
on publication date. Supply of
products conforms to Wolfson
Microelectronic's terms and
conditions.
Wolfson Microelectronics
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
Tel: +44 (0) 131 667 9386 Fax: +44 (0) 131 667 5176
email: sales@wolfson.co.uk
www: http://www.wolfson.co.uk
©
1998 Wolfson Microelectronics Ltd.
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
