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WM8141 参数 Datasheet PDF下载

WM8141图片预览
型号: WM8141
PDF下载: 下载PDF文件 查看货源
内容描述: 12位6MSPS CIS / CCD模拟前端/数字转换器 [12-bit 6MSPS CIS/CCD Analogue Front End/Digitiser]
分类和应用: 转换器
文件页数/大小: 31 页 / 239 K
品牌: WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
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WM8141
12-bit 6MSPS CIS/CCD Analogue Front End/Digitiser
Production Data, October 2000, Rev 3.0
DESCRIPTION
The WM8141 is a 12-bit analogue front end/digitiser that
processes and digitises the analogue output signals from
CCDs or Contact Image Sensors (CIS). The device can be
operated as either a three channel or a single channel
device at pixel sample rates of up to 6MSPS. The device
has both external and programmable internal black level
reference options for CIS operation. The WM8141 runs off a
single supply voltage of either 3.3V or 5V. Alternatively, the
device can be operated from split 5V core and 3.3V digital
interface supplies.
The WM8141 includes three analogue signal processing
channels each of which contains reset level clamping,
correlated double sampling and programmable offset and
gain adjust facilities. Each of these channels is time
multiplexed into a single high-speed 12-bit resolution ADC,
which digitises the pixel image information. The digital data
output is available to the user in either 12-bit parallel or
8/6/4-bit wide multiplexed formats.
The internal control registers are programmable via a
convenient serial or parallel digital interface. The WM8141
typically consumes only 45mA and less than 10µA when in
power down mode.
FEATURES
12-bit resolution ADC
6MSPS conversion rate at 5V supply
5V or 3.3V single supply or 5V/3.3V dual supply operation
Single or 3 channel operation
Correlated double sampling
Programmable gain (8-bit resolution)
Programmable offset adjust (8-bit resolution)
12-bit parallel or 8/6/4-bit wide multiplexed output bus
Internally generated voltage references
External or internal reference for CIS operation
Low power – 225mW typical at 5V supply
Interface and timing compatible with WM8143, WM8144
and WM8142 devices
Drop in replacement for WM8143-12
32-pin TQFP package
APPLICATIONS
Flatbed and sheetfeed scanners
USB compatible scanners
Multi-function peripherals
CCD sensor interface
Contact image sensor (CIS) interface
BLOCK DIAGRAM
VRLC/VBIAS
(18)
VSMP
(27)
MCLK
(28)
AVDD
(12)
DVDD1 DVDD2
(14)
(32)
VRT VRX VRB
(16) (17) (15)
CL
R
S
V
S
TIMING CONTROL
R
G
B
VREF/BIAS
M
U
X
8
WM8141
(22) OEB
OFFSET
DAC
+
PGA
8
RINP (21)
RLC
M
U
X
CDS
R
G
B
M
U
X
+
I/P SIGNAL
POLARITY
ADJUST
M
U
X
12
BIT
ADC
DATA
I/O
PORT
GINP (20)
RLC
CDS
8
+
OFFSET
DAC
PGA
8
+
I/P SIGNAL
POLARITY
ADJUST
(30) OP[0]
(31) OP[1]
(1) OP[2]
(2) OP[3]
(3) OP[4]
(4) OP[5]
(5) OP[6]
(6) OP[7]
(7) OP[8]
(8) OP[9]
(9) OP[10]
(10) OP[11]/SDO
BINP (19)
RLC
CDS
8
+
OFFSET
DAC
PGA
8
+
I/P SIGNAL
POLARITY
ADJUST
CONFIGURABLE
SERIAL/
PARALLEL
CONTROL
INTERFACE
(23) SEN/STB
(25) SCK/RNW
(24) SDI/DNA
(26) RLC/ACYC
(11) NRESET
RLC
DAC
4
(13)
AGND
(29)
DGND
WOLFSON MICROELECTRONICS LTD
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
http://www.wolfson.co.uk
Production Data
Datasheets contain final
specifications current on publication date.
Supply of products conforms to Wolfson
Microelectronics’ Terms and Conditions.
2000
Wolfson Microelectronics Ltd.