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INA117 ±200V差分放大器的输入滤波器
消耗积分:5 |
格式:rar |
大小:52 |
2009-06-02
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Many customers have asked how to add input filtering to the
INA117. Since the INA117 is rated for ±200V input voltage
(±500V without damage), it is commonly used in environments
with very high input noise or with high-voltage input
transients. This bulletin shows how to connect input filters,
discusses the errors they can add, and shows how to eliminate
the errors.
Figure 1 shows the connection of a differential input filter.
A pole is formed by C1 and the two external input resistors.
f–3dB = 1/(4 • p • RI • C1). Differential input filtering is
preferred because mismatches in filter components do not
degrade CMR.
INA117. Since the INA117 is rated for ±200V input voltage
(±500V without damage), it is commonly used in environments
with very high input noise or with high-voltage input
transients. This bulletin shows how to connect input filters,
discusses the errors they can add, and shows how to eliminate
the errors.
Figure 1 shows the connection of a differential input filter.
A pole is formed by C1 and the two external input resistors.
f–3dB = 1/(4 • p • RI • C1). Differential input filtering is
preferred because mismatches in filter components do not
degrade CMR.
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