ADS7870EA datasheet(8/45 Pages) TI1

Part #	ADS7870EA

Description	12-BIT, 52-kSPS, DATA ACQUISITION SYSTEM WITH ANALOG-TO-DIGITAL CONVERTER, MUX, PGA, AND REFERENCE

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Manufacturer	TI1 [Texas Instruments]

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ADS7870

SBAS124C − DECEMBER 1999 − REVISED DECEMBER 2005

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8

Figure 5

0

−0.5

−1

−2

0

0.5

1

1.5

2

2.5

3

1

1.5

Common-Mode Voltage − V

OUTPUT OFFSET ERROR

vs

COMMON-MODE VOLTAGE

2

3.5

4

4.5

5

0.5

−1.5

Gain = 1

Gain = 20

Gain = 10

1 LSB =

−72 dB for Gain = 1,

−98 dB for Gain = 20

Figure 6

4

3

1

−1

2

2.5

3

3.5

4

4.5

5

6

7

OUTPUT OFFSET ERROR

vs

POWER SUPPLY VOLTAGE

8

5.5

6

5

2

0

VDD − Supply Voltage − V

Gain = 20

Gain = 10

Gain = 1

4 LSB =

86 dB for Gain = 20,

60 dB for Gain = 1

50 Ksps, CCLK = 2.5 MHz,

VREF = 2.048 V

Figure 7

0.8

0.6

0.2

0

110

1

1.2

Sampling Rate − ksps

QUIESCENT CURRENT

vs

SAMPLING RATE

1.4

100

0.4

VDD = 3 V

VDD = 5 V

VREF and Buffer ON, Oscillator OFF

Serial Data Clocked During the 48 Clock

Count Conversion Cycle, CCLK = SCLK

Figure 8

3

2

1

0

1

245

8

10

16

4

5

Gain

PEAK-TO-PEAK OUTPUT NOISE

vs

GAIN

6

20

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