ADS7818E datasheet(5/21 Pages) TI

Part #	ADS7818E

Description	12-Bit High Speed Low Power Sampling ANALOG-TO-DIGITAL CONVERTER

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Manufacturer	TI [Texas Instruments]

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5

®

ADS7818

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VCC = +5V, fSAMPLE = 500kHz, fCLK = 16 • fSAMPLE, and internal +2.5V reference, unless otherwise specified.

POWER SUPPLY REJECTION

vs POWER SUPPLY RIPPLE FREQUENCY

1

10

100

1k

10k

100k

1M

Power Supply Ripple Frequency (Hz)

30

25

20

15

10

5

0

FREQUENCY SPECTRUM

(4096 Point FFT; f

IN = 10.9kHz, –0.2dB)

0

250

62.5

187.5

125

Frequency (kHz)

–120

–100

–80

–60

–40

–20

0

FREQUENCY SPECTRUM

(4096 Point FFT; f

IN = 102kHz, –0.2dB)

–100

–80

–60

–40

–20

0

250

62.5

187.5

125

Frequency (kHz)

–120

CHANGE IN FULL-SCALE ERROR

vs EXTERNAL REFERENCE VOLTAGE

2.3

2.0

2.5

2.1

2.2

2.4

External Reference Voltage (V)

–1.2

0.2

–0.4

–0.6

–0.8

–1.0

–0.2

0.0

CHANGE IN OFFSET

vs EXTERNAL REFERENCE VOLTAGE

2.5

1.9

3.1

2.1

2.3

2.7

2.9

External Reference Voltage (V)

–0.4

0.5

0.0

–0.1

–0.2

–0.3

0.1

0.2

0.3

0.4

PEAK-TO-PEAK NOISE

vs EXTERNAL REFERENCE VOLTAGE

2.3

2.0

2.5

2.1

2.2

2.4

External Reference Voltage (LSB)

0.40

0.70

0.65

0.60

0.55

0.50

0.45

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