ADS1258 datasheet(8/47 Pages) TI

Part #	ADS1258

Description	16-Channel, 24-Bit Analog-to-Digital Converter

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Manufacturer	TI [Texas Instruments]

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V

REF (V)

16

14

12

10

8

6

4

2

0

0.5

1.5

5.5

2.5

3.5

4.5

DRATE[1:0] = 11

DRATE[1:0] = 10

DRATE[1:0] = 01

DRATE[1:0] = 00

DVDD, AVDD−AVSS (V)

20

18

16

14

12

10

8

6

4

2.5

3.0

5.5

3.5

4.0

4.5

5.0

DRATE[1:0] = 11

from DVDD

from AVDD−AVSS

Temperature (

_C)

20

18

16

14

12

10

8

6

4

−40

−20

0

20

40

60

80

100

DRATE[1:0] = 11

Common−Mode Input Voltage (V)

20

15

10

5

0

5

0

−5

−10

−15

−3

−2

3

−1

0

1

2

OFFSET

CHOP = 1

OFFSET

CHOP = 0

NOISE

Offset (

µV)

200

180

160

140

120

100

80

60

40

20

0

311 units from one production lot.

CHOP = 1

Offset Drift (

µV/_C)

80

60

40

20

0

50 units from two

production lots.

Based on 20

_C intervals

over the range of

−40_C to +105_C.

CHOP = 1

ADS1258

SBAS297A – JUNE 2005 – REVISED SEPTEMBER 2005

TYPICAL CHARACTERISTICS (continued)

At T

A = +25°C, AVDD = +2.5V, AVSS = –2.5V, DVDD = +3.3V, fCLK = 16MHz (external), OPA227 buffer between MUX

outputs and ADC inputs, VREFP = +2.048V, and VREFN = –2.048V, unless otherwise noted.

NOISE vs VREF

NOISE vs SUPPLY VOLTAGE

Figure 9.

Figure 10.

NOISE AND OFFSET vs

NOISE vs TEMPERATURE

COMMON-MODE INPUT VOLTAGE

Figure 11.

Figure 12.

OFFSET HISTOGRAM

OFFSET DRIFT HISTOGRAM

Figure 13.

Figure 14.

8

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