AD7980 datasheet(9/22 Pages) AD

9 / 22 page

Preliminary Technical Data

AD7980

Rev Pr C | Page 9 of 22

TYPICAL PERFORMANCE CHARACTERISTICS: VDD=2.5V, VREF=5.0V, VIO=3.3V

-2

-1.5

-1

-0.5

0.5

1.5

16384

32768

49152

65536

CODE

POSITIVE INL: +0.23 LSB

NEGATIVE INL: -0.68 LSB

Figure 6. Integral Nonlinearity vs. Code

543

172

34629

45049

180726

20000

40000

60000

80000

100000

120000

140000

160000

180000

200000

7FF9

7FFA

7FFB

7FFC

7FFD

7FFE

7FFF

8000

8001

CODE IN HEX

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

-180

-160

-140

-120

-100

-80

-60

-40

-20

100

200

300

400

500

FREQUENCY (kHz)

fS = 1 MSPS

fIN = 20kHz

SNR = 91.5dB

THD = -101.0dB

SFDR = 103.5dB

SINAD = 91.0dB

Figure 8. FFT Plot

-2

-1.5

-1

-0.5

0.5

1.5

16384

32768

49152

65536

CODE

POSITIVE DNL: +0.32 LSB

NEGATIVE DNL: -0.25 LSB

Figure 9. Differential Nonlinearity vs. Code

005

3567

000

123672

5587

128289

20000

40000

60000

80000

100000

120000

140000

7FF9

7FFA

7FFB

7FFC

7FFD

7FFE

7FFF

8000

8001

8002

CODE IN HEX

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

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