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WM8195_05

更新时间： 2024-01-30 06:39:45
品牌 Logo 应用领域
欧胜 - WOLFSON 转换器
页数 文件大小 规格书
33页 374K
描述
14-bit 12MSPS CIS/CCD Analogue Front End/Digitiser

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WM8195_05 数据手册

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WM8195  
w
14-bit 12MSPS CIS/CCD Analogue Front End/Digitiser  
DESCRIPTION  
FEATURES  
•
•
•
•
•
•
•
•
•
•
•
14-bit ADC  
The WM8195 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 12MSPS.  
No missing codes guaranteed  
12MSPS conversion rate  
Low power – 210mW typical  
5V single supply or 5V/3.3V dual supply operation  
Single or 3 channel operation  
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 or 4-bit wide multiplexed  
format, with no missing codes.  
Correlated double sampling  
Programmable gain (8-bit resolution)  
Programmable offset adjust (8-bit resolution)  
Programmable clamp voltage  
14-bit parallel or 8, 7 or 4-bit wide multiplexed data output  
formats  
Internally generated voltage references  
48-lead 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 WM8195 typically  
only consumes 210mW when operating from a single 5V  
supply and less than 20µA when in power down mode.  
BLOCK DIAGRAM  
VSMP MCLK  
AVDD1-2  
VRX VRB  
VRT  
VRLC/VBIAS  
DVDD1-3  
w
WM8195  
CL  
RS VS  
TIMING CONTROL  
VREF/BIAS  
R
G
B
M
U
X
8
OFFSET  
DAC  
OEB  
OP[0]  
OP[1]  
OP[2]  
OP[3]  
OP[4]  
OP[5]  
OP[6]  
OP[7]  
OP[8]  
OP[9]  
OP[10]  
OP[11]  
OP[12]  
OP[13]/SDO  
RINP  
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  
BINP  
PGA  
8
OFFSET  
DAC  
8
I/P SIGNAL  
POLARITY  
ADJUST  
RLC  
PGA  
+
CDS  
+
8
OFFSET  
DAC  
8
I/P SIGNAL  
POLARITY  
ADJUST  
SEN/STB  
SCK/RNW  
SDI/DNA  
RLC/ACYC  
NRESET  
CONFIGURABLE  
SERIAL/  
PARALLEL  
CONTROL  
RLC  
DAC  
4
INTERFACE  
AGND1-6  
DGND1-5  
Production Data July 2005 Rev 4.1  
WOLFSON MICROELECTRONICS plc  
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/  
Copyright 2005 Wolfson Microelectronics plc.  
1234567...33

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