Datasheet

ADS62P45, ADS62P44
ADS62P43, ADS62P42
www.ti.com SLAS561C –JULY 2007– REVISED FEBRUARY 2012
Table 25. Predefined Coefficients for Decimation by 2 Filters
COEFFICIENTS DECIMATE BY 2
LOW-PASS FILTER HIGH-PASS FILTER
h0 23 -22
h1 -37 -65
h2 -6 -52
h3 68 30
h4 -36 66
h5 -61 -35
h6 35 -107
h7 118 38
h8 -100 202
h9 -197 -41
h10 273 -644
h11 943 1061
Table 26. Predefined Coefficients for Decimation by 4 Filters
COEFFICIENTS DECIMATE BY 4
LOW-PASS FILTER 1st BAND-PASS FILTER 2nd BAND-PASS FILTER HIGH-PASS FILTER
h0 -17 -7 -34 32
h1 -50 19 -34 -15
h2 71 -47 -101 -95
h3 46 127 43 22
h4 24 73 58 -8
h5 -42 0 -28 -81
h6 -100 86 -5 106
h7 -97 117 -179 -62
h8 8 -190 294 -97
h9 202 -464 86 310
h10 414 -113 -563 -501
h11 554 526 352 575
Custom Filter Coefficients with Decimation
The filter coefficients can also be programmed by the user (custom). For custom coefficients, set the register bit (
FILTER COEFF SELECT) and load the coefficients (h0 to h11) in registers 1E to 2F using the serial interface
(Table 27) as:
Register content = 12-bit signed representation of [real coefficient value × 2
11
]
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Product Folder Link(s): ADS62P45, ADS62P44 ADS62P43, ADS62P42