AD7946 Просмотр технического описания (PDF) - Analog Devices

Номер в каталоге

Компоненты Описание

производитель

AD7946

14-Bit, 500 kSPS PulSAR ADC in MSOP

Analog Devices 

AD7946

TYPICAL PERFORMANCE CHARACTERISTICS

1.0

POSITIVE INL = +0.17LSB

0.8

NEGATIVE INL = –0.26LSB

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

0

4096

8192

CODE

12288

Figure 6. Integral Nonlinearity vs. Code

16384

300000

250000

261120

VDD = REF = 5V

200000

150000

100000

50000

0

0

2009

0

200A

0

200B

200C

0

200D

0

200E

0

200F

CODE IN HEX

Figure 7. Histogram of a DC Input at the Code Center

0

8192 POINT FFT

–20

VDD = REF = 5V

fS = 500kSPS

–40

fIN = 20.14kHz

SNR = 85.3dB

THD = –105.2dB

–60

SECOND HARMONIC = –106dB

THIRD HARMONIC = –110dB

–80

–100

–120

–140

–160

–180

0

20 40 60 80 100 120 140 160 180 200 220 240

FREQUENCY (kHz)

Figure 8. FFT Plot

1.0

POSITIVE DNL = +0.20LSB

0.8

NEGATIVE DNL = –0.13LSB

0.6

0.4

0.2

0

–0.2

–0.4

–0.6

–0.8

–1.0

0

4096

8192

CODE

12288

Figure 9. Differential Nonlinearity vs. Code

16384

150000

125000

131592 129528 VDD = REF = 5V

100000

75000

50000

25000

0

0

2059

0

205A

205B

205C

CODE IN HEX

0

205D

0

205E

Figure 10. Histogram of a DC Input at the Code Transition

90

88

86

84

82

80

–10

–8

–6

–4

–2

INPUT LEVEL (dB)

Figure 11. SNR vs. Input Level

Rev. A | Page 8 of 24

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