ADS1294 datasheet(9/88 Pages) TI

9 / 88 page

ADS1294, ADS1294R

ADS1296, ADS1296R

ADS1298, ADS1298R

www.ti.com

SBAS459H

– JANUARY 2010 – REVISED OCTOBER 2011

NOISE MEASUREMENTS

NOTE

The ADS1294R/6R/8R channel performance differs from the ADS1294/6/8 in regards to

respiration circuitry found on channel one. Unless otherwise noted, ADS129x refers to all

specifications and functional descriptions of the ADS1294, ADS1296, ADS1298,

ADS1294R, ADS1296R, and ADS1298R.

The ADS129x noise performance can be optimized by adjusting the data rate and PGA setting. As the averaging

is increased by reducing the data rate, the noise drops correspondingly. Increasing the PGA value reduces the

input-referred noise, which is particularly useful when measuring low-level biopotential signals. Table 1 and

Table 2 summarize the noise performance of the ADS129x in the High-Resolution (HR) mode and Low-Power

(LP) mode, respectively, with a 3V analog power supply. Table 3 and Table 4 summarize the noise performance

of the ADS129x in the HR mode and LP mode, respectively, with a 5V analog power supply. The data are

representative of typical noise performance at TA = +25°C. The data shown are the result of averaging the

readings from multiple devices and are measured with the inputs shorted together. A minimum of 1000

consecutive readings are used to calculate the RMS and peak-to-peak noise for each reading. For the two

highest data rates, the noise is limited by quantization noise of the ADC and does not have a gaussian

distribution. Thus, the ratio between rms noise and peak-to-peak noise is approximately 10. For the lower data

rates, the ratio is approximately 6.6.

Table 1 to Table 4 show measurements taken with an internal reference. The data are also representative of the

ADS129x noise performance when using a low-noise external reference such as the REF5025.

Table 1. Input-Referred Noise (

μVRMS/μVPP) in High-Resolution Mode

3V Analog Supply and 2.4V Reference(1)

DR BITS OF

OUTPUT

–3dB

CONFIG1

DATA RATE

BANDWIDTH

PGA

(SPS)

(Hz)

GAIN = 1

GAIN = 2

GAIN = 3

GAIN = 4

GAIN = 6

GAIN = 8

GAIN = 12

000

32000

8398

335/3553

168/1701

112/1100

85/823

58/529

42.5/378

28.6/248

001

16000

4193

56/613

28/295

18.8/188

14.3/143

9.7/94

7.4/69

5.2/44.3

010

8000

2096

12.4/111

6.5/54

4.5/37.9

3.5/29.7

2.6/21.7

2.2/17.8

1.8/13.8

011

4000

1048

6.1/44.8

3.2/23.3

2.4/17.1

1.9/14.0

1.5/11.1

1.3/9.7

1.2/8.5

100

2000

524

4.1/27.8

2.2/15.4

1.6/11.0

1.3/9.1

1.1/7.3

1.0/6.5

0.9/6.0

101

1000

262

2.9/19.0

1.6/10.1

1.2/7.5

1.0/6.2

0.8/5.0

0.7/4.6

0.6/4.1

110

500

131

2.1/12.5

1.1/6.8

0.9/5.1

0.7/4.3

0.6/3.5

0.5/3.1

0.5/2.9

(1)

At least 1000 consecutive readings were used to calculate the RMS and peak-to-peak noise values in this table.

Table 2. Input-Referred Noise (

μVRMS/μVPP) in Low-Power Mode

3V Analog Supply and 2.4V Reference(1)

DR BITS OF

OUTPUT

–3dB

CONFIG1

DATA RATE

BANDWIDTH

PGA

(SPS)

(Hz)

GAIN = 1

GAIN = 2

GAIN = 3

GAIN = 4

GAIN = 6

GAIN = 8

GAIN = 12

000

16000

4193

333/3481

166/1836

111/1168

84/834

56/576

42/450

28/284

001

8000

2096

56/554

28/272

19/177

14.3/133

9.7/85

7.4/64

5.0/42.4

010

4000

1048

12.5/99

6.5/51

4.5/35.0

3.4/25.9

2.4/18.8

2.0/14.5

1.5/11.3

011

2000

524

6.1/41.8

3.2/22.2

2.3/15.9

1.8/12.1

1.4/9.3

1.2/7.8

1.0/6.7

100

1000

262

4.1/26.3

2.2/14.6

1.6/9.9

1.3/8.1

1.0/6.2

0.8/5.4

0.7/4.7

101

500

131

3.0/17.9

1.6/9.8

1.1/6.8

0.9/5.7

0.7/4.2

0.6/3.6

0.5/3.4

110

250

2.1/11.9

1.1/6.3

0.8/4.6

0.7/4.0

0.5/3.0

0.5/2.6

0.4/2.4

(1)

At least 1000 consecutive readings were used to calculate the RMS and peak-to-peak noise values in this table.

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