AD7674 datasheet(14/28 Pages) AD

Part #	AD7674

Description	18-Bit, 2.5 LSB INL, 800 kSPS SAR ADC

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Manufacturer	AD [Analog Devices]

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AD7674

Rev. 0 | Page 14 of 28

INPUT LEVEL (dB)

–60

101

98

95

96

100

03083-0-017

99

97

SNR

–50

0

–10

–20

–30

–40

105

102

104

103

VREF = 4.096V

S/(N+D)

Figure 17. SNR and S/(N+D) vs. Input Level

–55

98

96

03083-0-018

99

97

–35

125

85

65

5

–15

100

SNR

ENOB

14.5

15.0

15.5

16.5

16.0

S/(N+D)

25

45

105

TEMPERATURE (

°C)

VREF = 4.096V

Figure 18. SNR, S/(N+D), and ENOB vs. Temperature

TEMPERATURE (

°C)

–55

–120

–140

03083-0-019

–110

–130

–35

125

85

65

5

–15

–100

25

45

105

THIRD

HARMONIC

SECOND

HARMONIC

THD

Figure 19. THD and Harmonics vs. Temperature

SAMPLING RATE (SPS)

100000

0.001

1M

10000

1000

100

10

1

0.1

0.01

100k

10k

1k

100

1

AVDD, WARP/NORMAL

AVDD, IMPULSE

10

DVDD, WARP/NORMAL

DVDD, IMPULSE

OVDD, ALL MODES

PDBUF HIGH

03083-0-020

Figure 20. Operating Current vs. Sampling Rate

TEMPERATURE (

°C)

800

–55

700

500

300

0

400

100

600

125

DVDD

–35

–15

5

25456585

105

AVDD

OVDD

03083-0-021

Figure 21. Power-Down Operating Currents vs. Temperature

TEMPERATURE (

°C)

–55

–15

–25

03083-0-022

–20

–35

125

85

65

5

–15

25

45

105

–5

5

–10

0

10

15

20

POSITIVE

FULL SCALE

NEGATIVE

FULL SCALE

ZERO ERROR

Figure 22. Zero Error, Positive and Negative Full Scale vs. Temperature

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