AD7687 datasheet(9/28 Pages) AD

Part #	AD7687

Description	16-Bit, 1.5 LSB INL, 500 kSPS PulSAR Differential ADC in MSOP/QFN

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AD7688

Rev. A | Page 9 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

CODE

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

0

16384

32768

49152

65535

POSITIVE INL = +0.31LSB

NEGATIVE INL = –0.39LSB

Figure 7. Integral Nonlinearity vs. Code

300000

250000

150000

200000

100000

50000

0

CODE IN HEX

73

74

75

6F

70

71

72

0

2930

0

256159

2031

VDD = REF = 5V

Figure 8. Histogram of a DC Input at the Code Center

FREQUENCY (kHz)

0

–20

–40

–60

–80

–100

–120

–160

–140

–180

0

25

50

75

100

125

150

200

175

225

250

16384 POINT FFT

VDD = REF = 5V

FS = 500KSPS

FIN = 2kHz

SNR = 95.6dB

THD = –117.7dB

SFDR = –117.9dB

2nd HARM = –125dB

3rd HARM = –119dB

Figure 9. FFT Plot

CODE

1.5

1.0

0.5

0

–0.5

–1.0

–1.5

0

16384

32768

49152

65535

POSITIVE DNL = +0.37LSB

NEGATIVE DNL = –0.21LSB

Figure 10. Differential Nonlinearity vs. Code

160000

120000

140000

100000

80000

40000

20000

60000

0

CODE IN HEX

74

76

71

73

0

72

0

75

00

136187

124933

VDD = REF = 5V

Figure 11. Histogram of a DC Input at the Code Transition

INPUT LEVEL (dB)

0

–10

–8–6–4–2

100

99

98

97

96

95

94

93

92

91

90

Figure 12. SNR vs. Input Level

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