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XWM8191CFT

更新时间： 2024-09-29 22:10:51
品牌 Logo 应用领域
欧胜 - WOLFSON 转换器
页数 文件大小 规格书
27页 355K
描述
14-bit 6MSPS CIS/CCD Analogue Front End/Digitiser

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中文翻译

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XWM8191CFT 数据手册

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WM8191  
14-bit 6MSPS CIS/CCD Analogue Front End/Digitiser  
Advanced Information, April 2001, Rev 3.1  
DESCRIPTION  
FEATURES  
•
•
•
•
•
•
•
•
•
•
•
14-bit ADC  
No missing codes guaranteed  
6MSPS conversion rate  
The WM8191 is a 14-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 6MSPS.  
Low power – 250mW typical  
5V 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)  
Programmable clamp voltage  
14-bit parallel or 8/7/4-bit wide multiplexed data output  
formats  
The device includes three analogue signal processing  
channels each of which contains Reset Level Clamping,  
Correlated Double Sampling and Programmable Gain and  
Offset adjust functions. Three multiplexers allow single  
channel processing. The output from each of these  
channels is time multiplexed into a single high-speed 14-bit  
analogue-to-digital converter. The digital output data is  
available in 14-bit parallel or 8/7/4-bit wide multiplexed  
format, with no missing codes.  
•
•
•
Internally generated voltage references  
48-pin TQFP package  
Serial or parallel control interface  
An internal 4-bit DAC is supplied for internal reference level  
generation. This may be used during CDS to reference CIS  
signals or during Reset Level Clamping to clamp CCD  
signals. Alternatively an external reference level may be  
applied. ADC references are generated internally, ensuring  
optimum performance from the device.  
APPLICATIONS  
•
•
•
•
Flatbed and sheetfeed scanners  
USB compatible scanners  
Multi-function peripherals  
High-performance CCD sensor interface  
Using an analogue supply voltage of 5V and a digital  
interface supply of either 5V or 3.3V, the WM8191 typically  
only consumes 250mW when operating from a single 5V  
supply and less than 1µA when in power down mode.  
BLOCK DIAGRAM  
VRLC/VBIAS  
(2)  
VSMP MCLK  
(15) (17)  
AVDD1-2  
(43, 44)  
DVDD1-3  
(10, 24, 35)  
VRT VRX VRB  
(48) (1) (47)  
CL  
RS VS  
TIMING CONTROL  
WM8191  
VREF/BIAS  
R
8
M
U
X
OFFSET  
DAC  
(11) OEB  
G
B
(21) OP[0]  
(22) OP[1]  
(23) OP[2]  
(26) OP[3]  
(27) OP[4]  
(28) OP[5]  
(29) OP[6]  
(31) OP[7]  
(32) OP[8]  
(33) OP[9]  
(34) OP[10]  
(37) OP[11]  
(38) OP[12]  
(39) OP[13]/SDO  
RINP (8)  
RLC  
RLC  
CDS  
CDS  
+
+
PGA  
+
+
M
U
X
I/P SIGNAL  
POLARITY  
ADJUST  
R
G
B
8
M
U
X
DATA  
I/O  
PORT  
M
U
X
14-  
BIT  
ADC  
GINP (6)  
BINP (4)  
PGA  
8
8
OFFSET  
DAC  
I/P SIGNAL  
POLARITY  
ADJUST  
RLC  
CDS  
+
PGA  
8
+
8
OFFSET  
DAC  
I/P SIGNAL  
POLARITY  
ADJUST  
(12) SEN/STB  
(14) SCK/RNW  
(13) SDI/DNA  
(16) RLC/ACYC  
(42) NRESET  
CONFIGURABLE  
SERIAL/  
PARALLEL  
CONTROL  
RLC  
DAC  
4
INTERFACE  
(18, 25, 30, 36, 40)  
DGND1-5  
(3, 5, 7, 9, 45, 46)  
AGND1-6  
WOLFSON MICROELECTRONICS LTD  
Lutton Court, Bernard Terrace, Edinburgh, EH8 9NX, UK  
Tel: +44 (0) 131 667 9386  
Fax: +44 (0) 131 667 5176  
Advanced Information data sheets contain  
preliminary data on new products in the  
preproduction phase of development.  
Supplementary data will be published at a  
later date.  
Email: sales@wolfson.co.uk  
www.wolfsonmicro.com  
2001 Wolfson Microelectronics Ltd  
.
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