ADS7871_14 datasheet(8/46 Pages) TI1

Part #	ADS7871

Description	PGA Gains: 1, 2, 4, 5, 8, 10, 16, 20 V/V

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Manufacturer	TI1 [Texas Instruments]

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ADS7871

SLAS370C − APRIL 2002 − REVISED OCTOBER 2004

www.ti.com

8

Figure 5

−24

−16

−8

0

8

16

24

0

1

23

45

Gain = 20

OUTPUT OFFSET ERROR

vs

COMMON-MODE VOLTAGE

Common-Mode Voltage − V

Gain = 8

Gain = 1

VDD = 5 V,

TA = 25°C,

CCLK = 2.5 MHz

Figure 6

−8

−6

−4

−2

0

2

4

6

8

2.5

3

3.5

4

4.5

5

5.5

Gain = 20,

TA = 25°C,

CCLK = 2.5 MHz

VREF = 2.5 V

VREF = 2.048 V

Power Supply Voltage − V

OUTPUT OFFSET ERROR

vs

POWER SUPPLY VOLTAGE

Figure 7

2.45

2.475

2.5

2.525

2.55

2.575

2.6

2.625

2.65

−20 −18 −16 −14 −12 −10 −8

−6

−4

−2

0

BUFFER OUTPUT CHARACTERISTIC

IO − Output Current − mA

ZO = 2Ω Sourcing Current,

VDD = 5 V,

REFIN = 2.5 V,

TA = 25°C

Figure 8

0

0.5

1

1.5

2

2.5

3

3.5

4

4.5

5

5.5

−2

−1.5

−1

−0.5

0

0.5

1

1.5

2

REFERENCE OUTPUT CHARACTERISTIC

IO − Output Current − µA

VDD = 5 V,

CCLK = 2.5 MHz,

TA = 25°C

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