ADS4128 datasheet(30/61 Pages) TI

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ADS4128

SBAS578 – MAY 2012

www.ti.com

FREEZE

BYPASS

OFFSET

OFFSET CORR TIME CONSTANT

CORR

Bit 7

FREEZE OFFSET CORR

This bit sets the freeze offset correction.

0 = Estimation of offset correction is not frozen (bit EN OFFSET CORR must be set)

1 = Estimation of offset correction is frozen (bit EN OFFSET CORR must be set). When frozen, the

last estimated value is used for offset correction every clock cycle. See OFFSET CORRECTION,

Offset Correction.

Bit 6

Always write '0'

Bits[5:2]

OFFSET CORR TIME CONSTANT

These bits set the offset correction time constant for the correction loop time constant in number of

clock cycles.

VALUE

TIME CONSTANT (Number of Clock Cycles)

0000

1 M

0001

2 M

0010

4 M

0011

8 M

0100

16 M

0101

32 M

0110

64 M

0111

128 M

1000

256 M

1001

512 M

1010

1 G

1011

2 G

Bits[1:0]

Always write '0'

LOW SPEED

Bits[7:1]

Always write '0'

Bit 0

LOW SPEED: Low-speed mode

00, 01, 10 = Low-speed mode disabled (default state after reset); this setting is recommended for

sampling rates greater than 80 MSPS.

11 = Low-speed mode enabled; this setting is recommended for sampling rates less than or equal

to 80 MSPS.

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