Datasheet

HPFGainErrorFactor=
cos +sin 1w -
N N
w
cos w
N
2 -
1 2-1+
cos +sin 1-w w
N N
cos w
N
HPF(Z)=
1 Z-
-1
1 bZ-
-1
2 a-
2
´
b=
1+(1 a)-
2
2
ADS1281
SBAS378D –AUGUST 2007–REVISED JUNE 2010 www.ti.com
(11)
See the HPF Stage section for an example of how to use this equation.
HPF Transfer Function
(12)
where b is calculated as shown in Equation 13:
(13)
Table 25. t
DR
Time for Data Ready (Sinc Filter)
f
DATA
f
CLK
(1)
128k 440
64k 616
32k 968
16k 1672
8k 2824
(1) For SYNC and Wake-Up commands, f
CLK
= number of CLK cycles from next rising CLK edge directly after eighth rising SCLK edge to
DRDY falling edge. For Wake-Up command only, subtract two f
CLK
cycles.
Table 25 is referenced by Table 11 and Table 13.
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