ADS7871_14 datasheet(9/46 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

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9

Figure 9

−1

0

1

2

3

4

5

6

−6 −5 −4 −3 −2 −1

012

3456

VDD

VI x GAIN <VDD −1.4

Gain = 1

Gain = 20

Differential Input Voltage − V

TYPICAL INPUT RANGE

VDD = 5 V,

TA = 25°C

Figure 10

0

1

2

3

4

5

6

01

2

3

45

VDD

Upper Compliance Limit

Lower Compliance Limit

Level-Shift Error

Input to A/D

Valid Bit = 1

PGA OUTPUT

| VI | x Gain

VDD = 5 V,

TA = 25°C

Figure 11

0.0

0.2

0.4

0.6

0.8

1.0

1.2

1.4

1.6

1.8

0

5

10

15

20

25

30

35

40

45

50

QUIESCENT CURRENT

vs

SAMPLING RATE

Sampling Rate − ks/s

SCLK = CCLK = 52 x Sampling Rate,

VDD = 5 V,

VREF and Buf on, OSC off,

TA = 25°C

Figure 12

0

5

10

15

20

0

5

10

15

20

NOISE AND EFFECTIVE NUMBER OF BITS

vs

PGA GAIN

PGA Gain

15

14

13

12

11

CCLK = 2.5 MHz,

VDD = 5 V,

TA = 25°C

VREF = 2.5 V,

Internal Ref + Buf,

DC Input

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