AD7691 datasheet(10/28 Pages) AD

номер детали	AD7691

подробное описание детали	18-Bit, 1.5 LSB INL, 250 kSPS PulSAR Differential ADC in MSOP/QFN

PDF	28 Pages

Scroll/Zoom	100%

производитель	AD [Analog Devices]

домашняя страница	http://www.analog.com

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10 / 28 page

AD7691

Rev. 0 | Page 10 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

1.5

–1.5

262144

CODE

1.0

0.5

–0.5

–1.0

65536

131072

196608

POSITIVE INL = 0.39LSB

NEGATIVE INL = –0.73LSB

Figure 7. Integral Nonlinearity vs. Code 2.5 V

80k

CODE IN HEX

70k

60k

50k

40k

30k

20k

10k

2062

2904

69769

28527

27770

VDD = REF = 5V

σ = 0.76LSB

Figure 8. Histogram of a DC Input at the Code Center, 5 V

–180

FREQUENCY (kHz)

–20

–40

–60

–80

–100

–120

–140

–160

100

120

32768 POINT FFT

VDD = REF = 5V

fS = 250kSPS

fIN = 2kHz

SNR = 101.4dB

THD = –120.1dB

2ND HARMONIC = –140.7dB

3RD HARMONIC = –120.3dB

Figure 9. 2 kHz FFT Plot, 5 V

1.0

–1.0

262144

CODE

0.5

–0.5

65536

131072

196608

POSITIVE DNL = 0.37LSB

NEGATIVE DNL = –0.33LSB

Figure 10. Differential Nonlinearity vs. Code, 5 V

45k

CODE IN HEX

25 26

28 29

2C 2D

30 31

012 29 501

910 78 9 0

17460

28179

VDD = REF = 2.5V

σ = 1.42LSB

14362

24411

2997

38068

40k

35k

30k

25k

20k

15k

10k

4055

Figure 11. Histogram of a DC Input at the Code Center, 2.5 V

–180

FREQUENCY (kHz)

–20

–40

–60

–80

–100

–120

–140

–160

32768 POINT FFT

VDD = REF = 2.5V

fS = 180kSPS

fIN = 2kHz

SNR = 96.4dB

THD = –120.3dB

2ND HARMONIC = –132.5dB

3RD HARMONIC = –121.2dB

Figure 12. 2 kHz FFT Plot, 2.5 V

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