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PS081 bảng dữ liệu(PDF) 44 Page - ams AG

tên linh kiện PS081
Giải thích chi tiết về linh kiện  Single Chip Solution for Strain Gauges
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nhà sản xuất  AMSCO [ams AG]
Trang chủ  http://www.ams.com
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PS081 bảng dữ liệu(HTML) 44 Page - ams AG

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acam-messelectronic gmbh - Friedrich-List-Str.4 - D-76297 Stutensee-Blankenloch - Germany - www.acam.de
3-21
PSØ81
3.5.7
Comparator
The end of the discharge cycle is triggered by a comparator. PSØ8 offers an internal low noise com-
parator. Alternatively, an external comparator might be used.
3.5.7.1
Internal Comparator
The internal comparator is selected by setting reg11, sel_compint = 1. By means of the internal
comparator it is possible to get about 60,000 divisions peak-peak at 2 mV/V, 5 Hz update rate and
MEDIAN 5 software filter.
Figure 3.23 Internal comparator
3.5.7.2
External Comparator
The precision of the measurement can be improved by using an external bipolar comparator. With an
external bipolar comparator it is possible to get up to 150k divisions at 5Hz update rate.
Figure 3.24 External comparator
Recommendations:
Low-noise PNP transistors like 2N5087 / CMKT5087 or BC859 should be used. 5 transistors in
parallel should be connected at the LOAD side. It is not necessary to have matched transistors. Use
a COG-type capacitor for the low-pass filter capacitance.
Member of the ams Group



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