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WM8148

更新时间： 2024-01-25 22:34:26
品牌 Logo 应用领域
欧胜 - WOLFSON 转换器
页数 文件大小 规格书
43页 489K
描述
12-bit/12MSPS CCD/CIS Analogue Front End/Digitiser

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WM8148 数据手册

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WM8148  
12-bit/12MSPS CCD/CIS Analogue Front End/Digitiser  
Production Data, April 1999, Rev 4.0  
DESCRIPTION  
FEATURES  
•
•
•
•
•
•
•
•
•
•
Correlated double sampling  
Programmable gain amplifier  
Programmable input clamp voltage  
Offset correction  
12-bit, 12MSPS ADC  
Internal voltage reference  
12-bit or 8+4 bit data output mode  
Single 5V supply or 5V analogue/3.3V digital supply  
Programmable sample timing  
Control interface compatible with previous Wolfson  
AFEs  
The WM8148 is a 12-bit, 12MSPS analogue front end/  
digitiser IC, which interfaces to colour or monochrome linear  
array CCDs or contact image sensors (CIS). The device  
includes all the signal conditioning circuitry required to  
process the analogue signals from the CCD or CIS prior to  
the internal ADC.  
Three signal-processing channels are included in the  
device. Each channel features reset level clamping,  
correlated double sampling (CDS), offset correction and  
programmable gain amplification (PGA). The output signal  
from each channel is then multiplexed into  
a high  
•
48-pin TQFP package  
performance 12-bit analogue to digital converter (ADC).  
APPLICATIONS  
The reset level clamp and/or CDS functions can be selected  
or bypassed depending on the application.  
•
•
•
•
•
•
•
Flatbed scanners  
Document scanners  
Multi-function peripherals (MFPs)  
Colour copiers  
Character recognition systems  
Linear array CCDs  
The WM8148 can be operated in several modes. The  
operational mode of the device, including the sampling  
scheme and power management is programmed via the  
serial/parallel control interface.  
Contact image sensors (CIS)  
Output data is presented in either 12-bit parallel or byte-  
wide (8+4-bit) format.  
BLOCK DIAGRAM  
RLC  
(2)  
MCLK VSMP  
(5) (7)  
VRB VRT  
(29) (31)  
AVDD 1- 4  
(41,28,27,3)  
DVDD1-2  
(1,13)  
VRX  
(32)  
TIMING CONTROL  
VREF/BIAS  
CL RS VS  
WM8148  
CDS  
RLC  
RINP (36)  
PGA  
+
+
+
+
8
±
FULL  
OFFSET  
DAC  
(43) OEB  
.
_
.
SCALE  
2
6
12/8  
BIT  
MUX  
CDS  
RLC  
12-BIT  
ADC  
OP[11:0]  
(9-12,14-21)  
GINP (37)  
PGA  
MUX  
+
8
OFFSET  
DAC  
±
FULL  
.
_
.
SCALE  
2
6
BINP (39)  
VRLC (33)  
CDS  
RLC  
PGA  
+
8
±
FULL  
OFFSET  
DAC  
(48) PNS  
.
_
.
SCALE  
2
6
CONFIGURABLE  
SERIAL/PARALLEL  
CONTROL INTERFACE  
(34) OVRD  
(45) SDI/DNA  
(46) SCK/RNW  
(47) SEN/STB  
(42) NRESET  
(44) SDO  
4
RLC  
DAC  
(8,24,4,26)  
DGND1 - 4  
(35,40,30,25,6)  
AGND1 - 5  
Production Data contain final  
specifications current on publication date.  
Supply of products conforms to Wolfson  
Microelectronics' Terms and Conditions.  
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  
1999 Wolfson Microelectronics Ltd  
.
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