wm8150scds-r Wolfson Microelectronics plc, wm8150scds-r Datasheet
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wm8150scds-r
Manufacturer Part Number
wm8150scds-r
Description
Single Channel 12-bit Cis/ccd Afe With 4-bit Wide Output
Manufacturer
Wolfson Microelectronics plc
Datasheet
1.WM8150SCDS-R.pdf
(26 pages)
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DESCRIPTION
The WM8150 is a 12-bit analogue front end/digitiser IC
which processes and digitises the analogue output signals
from CCD sensors or Contact Image Sensors (CIS) at pixel
sample rates of up to 8MSPS.
The device includes a complete analogue signal processing
channel containing Reset Level Clamping, Correlated
Double Sampling, Programmable Gain and Offset adjust
functions. Internal multiplexers allow fast switching of offset
and gain for line-by-line colour processing. The output from
this channel is time multiplexed into a high-speed 12-bit
Analogue to Digital Converter. The digital output data is
available in 4-bit wide multiplexed format.
An internal 4-bit DAC is supplied for internal reference level
generation. This may be used to reference CIS signals or
during Reset Level Clamping to clamp CCD signals. An
external reference level may also be supplied. ADC
references are generated internally, ensuring optimum
performance from the device.
Using an analogue supply voltage of 5V, a digital core
voltage of 5V, and a digital interface supply of either 5V or
3.3V, the WM8150 typically only consumes 160mW when
operating from a single 5V supply.
BLOCK DIAGRAM
WOLFSON MICROELECTRONICS plc
w :www.wolfsonmicro.com
VRLC/VBIAS
VINP
Single Channel 12-bit CIS/CCD AFE with 4-bit Wide Output
RLC
CL
DAC
RLC
4
R
CDS
S
VSMP
V
S
TIMING CONTROL
MCLK
R
G
B
R
G
B
M
U
X
M
U
X
AGND1
8
OFFSET
DAC
AVDD
FEATURES
APPLICATIONS
+
AGND2
DVDD1
12-bit ADC
8MSPS conversion rate
Low power - 170mW typical
5V single supply or 5V/3.3V dual supply operation
Single channel operation
Correlated double sampling
Programmable gain (8-bit resolution)
Programmable offset adjust (8-bit resolution)
Programmable clamp voltage
4-bit wide multiplexed data output format
Internally generated voltage references
20-pin SSOP package
Serial control interface
Flatbed and sheetfeed scanners
USB compatible scanners
Multi-function peripherals
High-performance CCD sensor interface
PGA
8
VREF/BIAS
W
WM8150
DVDD2
I/P SIGNAL
POLARITY
ADJUST
Copyright
DGND
Production Data, February 2005, Rev 4.1
+
2005 Wolfson Microelectronics plc
VRT
ADC
BIT
12-
CONFIGURABLE
VRX
INTERFACE
CONTROL
SERIAL
WM8150
VRB
DATA
PORT
I/O
OP[0]
OP[1]
OP[2]
OP[3]/SDO
SEN
SCK
SDI