WM8143-12 Datasheet, PDF (1/24 Pages) Wolfson Microelectronics plc – 12-bit/4MSPS CCD Signal Processor

WM8143-12
12-bit/4MSPS CCD Signal Processor
Production Data Nov. 1999 Rev 4
Description
The WM8143-12 integrates the analogue signal
conditioning required by CCD sensors with a 12-bit ADC.
The WM8143-12 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[11:0] via a 12/8 bit
multiplexer, enabled by the OEB signal.
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 WM8143-12 can be
configured for pixel-by-pixel or line-by-line multiplexing
operation. Reset level clamp and/or CDS features can be
optionally bypassed. The device configuration is
programmed either via a simple serial interface or via an
eight-bit parallel interface.
The serial/parallel interfaces of the WM8143-12 are
control compatible with those of the WM8144-10 and
WM8144-12.
Features
• Reset level clamp
• Correlated double sampling (CDS)
• Fine offset level shifting
• Programmable gain amplification
• 12-bit ADC with maximum 4 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
• 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
VMID
RINP
GINP
BINP
CL RS VS
S/H
S/H
CDS
S/H
S/H
CDS
MUX
PGA
5-BIT REG
PGA
5-BIT REG
S/H
S/H
CDS
PGA
5-BIT REG
TIMING CONTROL
OFFSET
+
+
8-BIT +
SIGN DAC
VMID
OFFSET
M
+
+
U
X
8-BIT +
SIGN DAC
VMID
OFFSET
+
+
8-BIT +
SIGN DAC
VMID
WM8143-12
12-bit
ADC
12/8
MUX
CONFIGURABLE
SERIAL/PARALLEL
CONTROL INTERFACE
OEB
OP[11:0]
SDI / DNA
SCK / RNW
SEN / STB
NRESET
Production Data datasheets contain
final specifications current on
publication date. Supply of products
conforms to Wolfson
Microelectronics' terms and
conditions.
Wolfson Microelectronics ^{©1999 Wolfson Microelectronics Ltd.}
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK
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www: http://www.wolfson.co.uk