ADS5294 datasheet(41/67 Pages) TI1

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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

www.ti.com

SLAS776B – NOVEMBER 2011 – REVISED JULY 2012

AVG_CTRL1<1>

AVG_CTRL1<0>

Contents of Bin 1

ADC Channel 7

ADC Channel 6

Average of ADC Channel 6, 5

AVG_CTRL8<1>

AVG_CTRL8<0>

Contents of Bin 8

Zero

ADC Channel 8

Average of ADC Channel 7, 8

Average of ADC Channel 5, 6, 7, 8

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

automatically powered down.

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:

(1)

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