AS5601-ASOT datasheet(29/43 Pages) AMSCO

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ams Datasheet

Page 29

[v1-02] 2014-Oct-29

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AS5601 − Register Description

Figure 29:

Step Response (fast filter OFF)

For a fast step response and low noise after settling, the fast

filter can be enabled. The fast filter works only if the input

variation is greater than the fast filter threshold, otherwise the

output response is determined only by the slow filter. The fast

filter threshold is programmed with the FTH bits in the CONF

SF=11) kicks in and takes care of a fast settling. The larger noise

band of the fast filter is reduced again after the slow filter

(depicted is setting SF=00) has taken over. The different noise

bands are shown in Figure 28.

Figure 30:

Fast Filter Threshold

FTH

Fast Filter Threshold (LSB)

Slow-to-fast filter

Fast-to-slow filter

000

Slow filter only

001

010

011

100

101

110

111

Input

Output

response

Sampling

Frequency

Settling Time

according slow filter setting

Noise

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