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AD7294 bảng dữ liệu(PDF) 20 Page - Analog Devices

tên linh kiện AD7294
Giải thích chi tiết về linh kiện  12-Bit, Multichannel, DAC/ADC Temperature Sensor and Current Sense for Monitor and Control Applications
PDF  45 Pages
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nhà sản xuất  AD [Analog Devices]
Trang chủ  http://www.analog.com
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AD7294 bảng dữ liệu(HTML) 20 Page - Analog Devices

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AD7294
Preliminary Technical Data
Rev. PrB | Page 20 of 45
is preferred. In addition, choosing a reference with an output
trim adjustment, such as the on-chip internal reference or the
AD431, allows a system designer to trim system errors by
setting a reference voltage to a voltage other than the nominal.
Long-term drift is a measure of how much the reference drifts
over time. A reference with a tight long-term drift specification
ensures that the overall solution remains stable during its entire
lifetime. If choosing an external reference, consider a tight tem-
perature coefficient specification to reduce the temperature
dependence of the system output voltage on ambient conditions.
ANALOG COMPARATOR LOOP
The AD7294 consists of two set-point comparators that are
used for independent analog control. The advantage of using
analog control for current sensing is the dynamic speed of the
analog loop vs. the speed of the digital loop, in that the analog
control loop does not have the digital delays inherent in ADC-
to-DAC signal processing. The ISENSEOVERRANGE pins signal
whether the instrumentation amplifiers voltage from the
current sense is greater then or less then the set point 240 mV.
The 240 mV is the fixed threshold voltage of the over-range
comparator and the current sense amplifier will saturate above
this.



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