AD7674 datasheet(12/28 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 12 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

CODE

2.5

0

65536

131072

196608

262144

1.5

1.0

0

–1.5

0.5

–0.5

03083-0-005

–1.0

2.0

Figure 5. Integral Nonlinearity vs. Code

CODE IN HEX

70000

2004C

0

60000

40000

20000

0

30000

10000

50000

2004D

0

2004E

87

2004F

5073

20050

59121

20051 20052 20053

47

20054

0

20055

0

VREF = 5V

7165

58556

03083-0-006

Figure 6. Histogram of 131,072 Conversions of a

DC Input at the Code Transition

POSITIVE INL (LSB)

120

0

100

60

20

0

40

80

0.5

1.0

1.5

2.0

03083-0-007

2.5

Figure 7. Typical Positive INL Distribution (424 Units)

CODE

2.0

0

65536

131072

196608

262144

1.5

1.0

0

–1.0

0.5

–0.5

03083-0-008

Figure 8. Differential Nonlinearity vs. Code

CODE IN HEX

90000

2004D

0

60000

40000

20000

0

30000

10000

50000

1

2004E 2004F 20050 20051 20052 20053

627

20054

8

20055

0

VREF = 5V

25964

70000

80000

26939

28939

03083-0-009

793

Figure 9. Histogram of 131,072 Conversions of a

DC Input at the Code Center

NEGATIVE INL (LSB)

100

–2.5

80

60

20

0

50

70

–2.0

–1.5

1.0

–0.5

03083-0-010

90

40

30

10

0

Figure 10. Typical Negative INL Distribution (424 Units)

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