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參數(shù)資料
| 型號： | XWM8181CDW |
| 廠商： | Wolfson Microelectronics |
| 英文描述： | 12-bit 2MSPS Serial Output CIS/CCD Digitiser |
| 中文描述： | 12位2MSPS串行輸出獨聯(lián)體/防治荒漠化公約數(shù)字化儀 |
| 文件頁數(shù)： | 11/14頁 |
| 文件大?。?/td> | 150K |
| 代理商： | XWM8181CDW |
Advanced Information
WM8181
WOLFSON MICROELECTRONICS LTD
AI Rev 3.0 January 2000
11
CCD SCANNER
The differential nature of the WM8181 allows it to interface as easily to CCD sensors as to CIS. The
negative going video simply requires that the VINP and VINM pins are swapped over so that the
video signal is applied to VINM and the reference voltage is applied to VINP. The d.c. level of the
CCD output must lie within the input limits of the WM8181. A level shifter may be required to ensure
this. See Figure 8.
SYSTEM
ASIC
CCD
SENSOR
V
OUT
WM8181
VSMP
DOUT
MCLK
VINP
VINM
CLAMP
VREFIN
VRT
VRB
BLACK
REFERENCE
LEVEL
LEVEL
SHIFT
LEVEL SHIFT
DEPENDENT ON
V
OUT
DC LEVEL
SET VOLTAGE TO MATCH
V
PP
FROM SENSOR.
Figure 8 d.c. Coupled Negative Video
USING THE INTERNAL CLAMP
When using a CCD it is recommended that the designer use a.c. (capacitive) coupling between the
CCD output buffer and the input to the WM8181, shown in Figure 9. A CCD sensor has a negative
going video signal superimposed on a d.c. voltage of around 6V. The series capacitor between the
CCD buffer and the input to the WM8181 removes this large d.c. voltage while still allowing the video
signal through.
SYSTEM
ASIC
CCD
SENSOR
V
OUT
WM8181
VSMP
DOUT
MCLK
VINP
VINM
CLAMP
VREFIN
VRT
VRB
4.7k
4.7k
220n
200p
SET VOLTAGE TO MATCH
V
PP
FROM SENSOR.
Figure 9 a.c. Coupled Negative Video
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