AMC1305L25-Q1 Datasheet, PDF (26/38 Pages) Texas Instruments – High-Precision, Reinforced Isolated Delta-Sigma Modulators

AMC1305L25-Q1, AMC1305M05-Q1, AMC1305M25-Q1
SBAS797 – FEBRUARY 2017
www.ti.com
Typical Applications (continued)
9.2.1.3 Application Curve
In motor control applications, a very fast response time for overcurrent detection is required. The time for fully
settling the filter in case of a step-signal at the input of the modulator depends on its order; that is, a sinc³ filter
requires three data updates for full settling (with f_DATA = f_CLK / OSR). Therefore, for overcurrent protection, filter
types other than sinc³ can be a better choice; an alternative is the sinc² filter. Figure 55 compares the settling
times of different filter orders.
16
14
12
10
8
6
4
sinc1
2
sinc2
sinc3
0
0 2 4 6 8 10 12 14 16 18 20
settling time (µs)
D054
Figure 55. Measured Effective Number of Bits versus Settling Time
The delay time of the sinc filter with a continuous signal is half of its settling time.
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