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NOISE PERFORMANCE

ADS1230

SBAS366A – OCTOBER 2006 – REVISED JULY 2007

The ADS1230 offers outstanding noise performance. Table 1 summarizes the typical noise performance with

inputs shorted externally for different data rates and voltage reference values.

The RMS and Peak-to-Peak noise are referred to the input. The effective number of bits (ENOB) is defined as:

ENOB = ln (FSR/RMS noise)/ln(2)

The Noise-Free Bits are defined as:

Noise-Free Bits = ln (FSR/Peak-to-Peak Noise)/ln(2)

Where:

RMS NOISE

ENOB

DATA RATE

GAIN

(nV)

(nV)

(RMS)

NOISE-FREE BITS

64

53

290

20.5

18

10

128

40

198

19.8

17.5

64

100

480

19.5

17.3

80

128

88

480

18.7

16.3

(1)

Peak-to-peak data are based on direct measurement.

RMS NOISE

ENOB

DATA RATE

GAIN

(nV)

(nV)

(RMS)

NOISE-FREE BITS

64

46

290

20.6

18

10

128

49

259

19.6

17.2

64

100

576

19.5

17

80

128

102

461

18.5

16.3

(1)

Peak-to-peak data are based on direct measurement.

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