ADS5294IPFPR datasheet(55/82 Pages) TI2

55 / 82 page

y(n) =

[x(n) x(n 1)+y(n 1)]

2 +1

ADS5294

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SLAS776E – NOVEMBER 2011 – REVISED APRIL 2018

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Table 17. Digital Filters

DECIMATION

TYPE OF FILTER

DATA_RAT

FILTERn_RA

FILTERn_CO

EFF_SET

ODD_TAP

USE_FILTE

R_CHn

EN_CUSTOM_

FILT

Decimate by 2

Built-in low-pass odd-tap filter (pass band = 0 to fS/4)

000

Built-in highpass odd-tap filter (pass band = fS/4 to fS/2 )

000

001

Decimate by 4

Built-in lowpass even-tap filter (pass band = 0 to fS/8)

001

010

Built-in first bandpass even tap filter(pass band = fS/8 to fS/4)

001

011

Built-in second bandpass even tap filter(pass band = fS/4 to 3

fS/8)

001

100

Built-in highpass odd tap filter (pass band = 3 fS/8 to fS/2)

001

101

Decimate by 2

Custom filter (user-programmable coefficients)

000

0 and 1

Decimate by 4

Custom filter (user-programmable coefficients)

001

000

0 and 1

Decimate by 8

Custom filter (user-programmable coefficients)

100

000

0 and 1

Bypass decimation

Custom filter (user-programmable coefficients)

011

000

0 and 1

Note: EN_CUSTOM_FILT is the D15 of register 5A (Hex) to B9 (Hex).

The choice of the odd or even tap setting, filter coefficient set, and the filter rate uniquely determines the filter to

be used. In addition to the preset filter coefficients, the coefficients for each of the eight filter channels can be

programmed by the user. Each of the eight channels has 12 programmable coefficients, each 12-bit long. The 96

registers with addresses from 5A (Hex) to B9 (Hex) are used to program these eight sets of 12 programmable

coefficients. Registers 5A to 65 are used to program the first filter, with the first coefficient occupying the bits

D11..D0 of register 5A, the second coefficient occupying the bits D11..D0 of register 5B, and so on. Similarly

registers 66 (Hex) to 71 (Hex) are used to program the second filter, and so on.

When programming the filter coefficients, the D15 bit, EN_CUSTOM_FILT, of each of the 12 registers

corresponding to that filter should be set to ‘1’. If the D15 bit of these 12 registers is set to ‘0’, then the preset

coefficient (as programmed by FILTERn_COEFF_SET<2:0>) is used even if the bits D11..D0 get programmed.

By setting or not setting the D15 bits of individual filter channels to ‘1’, some filters can be made to operate with

preset coefficient sets, and some others can be made to simultaneously operate with programmed coefficient

sets.

9.6.1.10 Highpass Filter

Table 18. Highpass Filter

ADDR.

(HEX)

D15

D14

D13

D12

D11

D10

NAME

HPF_corner_CH1

HPF_EN_CH1

HPF_corner_CH2

HPF_EN_CH2

HPF_corner_CH3

HPF_EN_CH3

HPF_corner_CH4

HPF_EN_CH4

HPF_corner_CH5

HPF_EN_CH5

HPF_corner_CH6

HPF_EN_CH6

HPF_corner_CH7

HPF_EN_CH7

HPF_corner_CH8

HPF_EN_CH8

This group of registers controls the characteristics of a digital highpass transfer function applied to the output

data, using Equation 4:

where

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