AD7985BCPZ datasheet(10/29 Pages) AD

10 / 29 page

Data Sheet

AD7985

Rev. C | Page 9 of 28

TYPICAL PERFORMANCE CHARACTERISTICS

AVDD = DVDD = VIO = 2.5 V, BVDD = 5.0 V, VREF = 5.0 V, external reference (PDREF is high, REFIN is low), unless otherwise noted.

1.25

–1.25

–1.00

–0.75

–0.50

–0.25

0.25

0.50

0.75

1.00

16,384

32,768

49,152

65,536

CODE

POSITIVE INL = +0.38LSB

NEGATIVE INL = –0.46LSB

Figure 5. Integral Nonlinearity vs. Code

60,000

50,000

40,000

30,000

20,000

10,000

CODE IN HEX

7FFC 7FFD 7FFE 7FFF

8000

8001

8002

8003

8004

122

6150

38,843

57,138

26,249

2537

Figure 6. Histogram of DC Input at Code Center (External Reference)

60,000

50,000

40,000

30,000

20,000

10,000

CODE IN HEX

7FFD

7FFC

7FFB

7FFE 7FFF 8000 8001 8002 8003 8004 8005

565

33,064

49,585

31,957

7024

403

8455

Figure 7. Histogram of DC Input at Code Center (Internal Reference)

1.00

–1.00

–0.75

–0.50

–0.25

0.25

0.50

0.75

16,384

32,768

49,152

65,536

CODE

POSITIVE DNL = +0.19LSB

NEGATIVE DNL = –0.20LSB

Figure 8. Differential Nonlinearity vs. Code

60,000

50,000

40,000

30,000

20,000

10,000

CODE IN HEX

7FFD

7FFC

7FFB

7FFE 7FFF 8000 8001 8002 8003 8004

479

11,888

48,730

53,522

15,645

800

Figure 9. Histogram of DC Input at Code Transition (External Reference)

50,000

45,000

40,000

35,000

30,000

25,000

20,000

15,000

10,000

5000

CODE IN HEX

7FFE

7FFD

7FFC

7FFF 8000 8001 8002 8003 8004 8005

2947

20,474

46,649

43,622

15,598

1662

Figure 10. Histogram of DC Input at Code Transition (Internal Reference)

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