ADS5294IPFP datasheet(53/81 Pages) TI1

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y(n)=

x(n)+h

x(n 1)+h

x(n 2)+...+h

x(n 10)+h

x(n 11)+h

x(n 12)...+h

x(n 21)+h

x(n 22)

÷ ë

y(n) =

x(n)+h

x(n 1)+h

x(n

2)+...+h

x(n 11)+h

x(n 12)...+h

x(n 22)+h

x(n 23)

÷ ë

ADS5294

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SLAS776D – NOVEMBER 2011 – REVISED SEPTEMBER 2015

When the contents of a particular Bin is set to zero, then the LVDS buffer corresponding to that Bin gets

automatically powered down.

9.6.1.9 Decimation Filter

Table 16. Decimation Filter

ADDR.

D15 D14 D13 D12 D11 D10

NAME

(HEX)

GLOBAL_EN_FILTER

FILTER1_COEFF_SET<2:0>

FILTER1_RATE<2:0>

ODD_TAP1

USE_FILTER1

FILTER2_COEFF_SET<2:0>

FILTER2_RATE<2:0>

ODD_TAP2

USE_FILTER2

FILTER3_COEFF_SET<2:0>

FILTER3_RATE<2:0>

ODD_TAP3

USE_FILTER3

FILTER4_COEFF_SET<2:0>

FILTER4_RATE<2:0>

ODD_TAP4

USE_FILTER4

FILTER5_COEFF_SET<2:0>

FILTER5_RATE<2:0>

ODD_TAP5

USE_FILTER5

FILTER6_COEFF_SET<2:0>

FILTER6_RATE<2:0>

ODD_TAP6

USE_FILTER6

FILTER7_COEFF_SET<2:0>

FILTER7_RATE<2:0>

ODD_TAP7

USE_FILTER7

FILTER8_COEFF_SET<2:0>

FILTER8_RATE<2:0>

ODD_TAP8

USE_FILTER8

The decimation filter is implemented as 24-tap FIR with symmetrical coefficients (each coefficient is 12-bit

signed). The filter equation is:

(2)

By setting the register bit <ODD_TAPn> = 1, a 23-tap FIR is implemented:

(3)

In Equation 2 and Equation 3, h0, h1 …h11 are 12-bit signed representation of the coefficients, x(n) is the input

data sequence to the filter and y(n) is the filter output sequence.

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