AD7694 datasheet(11/24 Pages) AD

11 / 24 page

Data Sheet

AD7988-1/AD7988-5

Rev. B | Page 11 of 24

CODE

16384

32768

49152

65536

1.00

–1.00

0.75

0.50

0.25

–0.25

–0.75

–0.50

POSITIVE INL: +0.18 LSB

NEGATIVE INL: –0.21 LSB

Figure 12. Differential Nonlinearity vs. Code, VREF = 5 V

CODE

16384

32768

49152

65536

1.00

–1.00

0.75

0.50

0.25

–0.25

–0.75

–0.50

POSITIVE INL: +0.25 LSB

NEGATIVE INL: –0.22 LSB

Figure 13. Differential Nonlinearity vs. Code, VREF = 2.5 V

180k

CODE IN HEX

8003 8004 8005 8006 8007 8008 8009 800A 800B 800C 800D 800E 800F

1291

852

160k

140k

120k

100k

80k

60k

40k

20k

52720

162595

42731

Figure 14. Histogram of a DC Input at the Code Center, VREF = 5 V

60k

CODE IN HEX

50k

30k

10k

40k

20k

7FFA 7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006

2290

18848

50970

45198

12424

1217

Figure 15. Histogram of a DC Input at the Code Transition, VREF = 2.5 V

100

REFERENCE VOLTAGE (V)

SNR

SINAD

ENOB

2.25

2.75

3.25

3.75

4.25

4.75

5.25

Figure 16. SNR, SINAD, and ENOB vs. Reference Voltage

60k

590

CODE IN HEX

50k

30k

10k

40k

20k

7FFA 7FFB 7FFC 7FFD 7FFE 7FFF 8000 8001 8002 8003 8004 8005 8006

7285

37417

53412

31540

5807

512

Figure 17. Histogram of a DC Input at the Code Center, VREF = 2.5 V

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