AD79821 datasheet(8/24 Pages) AD

8 / 24 page

AD7946

Rev. A | Page 8 of 24

TYPICAL PERFORMANCE CHARACTERISTICS

CODE

1.0

0.8

0.6

0.4

0.2

–0.2

–0.4

–0.6

–0.8

–1.0

4096

8192

12288

16384

POSITIVE INL = +0.17LSB

NEGATIVE INL = –0.26LSB

Figure 6. Integral Nonlinearity vs. Code

50000

100000

150000

200000

250000

300000

2009

200A

200B

200C

200D

200E

200F

CODE IN HEX

261120

VDD = REF = 5V

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

FREQUENCY (kHz)

–20

–40

–60

–80

–100

–120

–140

–160

–180

80 100 120 140 160 180 200 220 240

8192 POINT FFT

VDD = REF = 5V

fS = 500kSPS

fIN = 20.14kHz

SNR = 85.3dB

THD = –105.2dB

SECOND HARMONIC = –106dB

THIRD HARMONIC = –110dB

Figure 8. FFT Plot

CODE

POSITIVE DNL = +0.20LSB

NEGATIVE DNL = –0.13LSB

1.0

0.8

0.6

0.4

0.2

–0.2

–0.4

–0.6

–0.8

–1.0

4096

8192

12288

16384

Figure 9. Differential Nonlinearity vs. Code

25000

50000

75000

100000

125000

150000

2059

205A

205B

205C

205D

205E

CODE IN HEX

131592

129528

VDD = REF = 5V

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

INPUT LEVEL (dB)

–10

–8–6–4–2

Figure 11. SNR vs. Input Level

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