EVAL-SDP-CB1Z 데이터 시트보기 (PDF) - Analog Devices

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EVAL-SDP-CB1Z

16-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP

Analog Devices 

Data Sheet

AD7687

TYPICAL PERFORMANCE CHARACTERISTICS

1.5

POSITIVE INL = +0.32LSB

NEGATIVE INL = –0.41LSB

1.0

0.5

0

–0.5

–1.0

–1.5

0

16384

32768

CODE

49152

Figure 6. Integral Nonlinearity vs. Code

65535

300000

250000

200000

258680

VDD = REF = 5V

150000

100000

50000

0

0

1049

1391

0

0

0

41

42

43

44

45

46

47

CODE IN HEX

Figure 7. Histogram of a DC Input at the Code Center, VDD = REF = 5 V

0

–20

–40

–60

–80

–100

–120

–140

–160

–180

0

8192 POINT FFT

VDD = REF = 5V

fS = 250kSPS

fIN = 2.1kHz

SNR = 95.5dB

THD = –118.3dB

2nd HARMONIC = –130dB

3rd HARMONIC = –122.7dB

20

40

60

80

100

120

FREQUENCY (kHz)

Figure 8. FFT Plot, VDD = REF = 5 V

1.5

POSITIVE DNL = +0.27LSB

NEGATIVE DNL = –0.24LSB

1.0

0.5

0

–0.5

–1.0

–1.5

0

16384

32768

CODE

49152

Figure 9. Differential Nonlinearity vs. Code

65535

250000

200000

200403

VDD = REF = 2.5V

150000

100000

50000

30721

29918

0

0 60

18 0

0

0

44 45 46 47 48 49 4A 4B 4C

CODE IN HEX

Figure 10. Histogram of a DC Input at the Code Center, VDD = REF = 2.5 V

0

–20

–40

–60

–80

–100

–120

–140

–160

–180

0

32768 POINT FFT

VDD = REF = 2.5V

fS = 250kSPS

fIN = 2kHz

SNR = 92.8dB

THD = –115.9dB

2nd HARMONIC = –124dB

3rd HARMONIC = –119dB

20

40

60

80

100

120

FREQUENCY (kHz)

Figure 11. FFT Plot, VDD = REF = 2.5 V

Rev. E | Page 11 of 26

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