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AD22057,pdf datasheet (Interfa
消耗积分:3 |
格式:rar |
大小:192 |
2009-08-25
王涛
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To produce a full-scale output of +4 V, a gain ´40 is used, adjustable
by ±5% to absorb the tolerance in the sense resistor. There is
sufficient headroom to allow at least a 10% overrange (to +4.4 V).
The roughly triangular voltage across the sense resistor is averaged
by a single-pole low-pass filter, here set with a corner frequency
of fC = 3.6 Hz, which provides about 30 dB of attenuation
at 100 Hz. A higher rate of attenuation can be obtained by a
two-pole filter having fC = 20 Hz, as shown in Figure 11. Although
this circuit uses two separate capacitors, the total capacitance
is less than half that needed for the single-pole filter.
by ±5% to absorb the tolerance in the sense resistor. There is
sufficient headroom to allow at least a 10% overrange (to +4.4 V).
The roughly triangular voltage across the sense resistor is averaged
by a single-pole low-pass filter, here set with a corner frequency
of fC = 3.6 Hz, which provides about 30 dB of attenuation
at 100 Hz. A higher rate of attenuation can be obtained by a
two-pole filter having fC = 20 Hz, as shown in Figure 11. Although
this circuit uses two separate capacitors, the total capacitance
is less than half that needed for the single-pole filter.
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