AD7631BSTZ datasheet(12/32 Pages) AD

12 / 32 page

AD7631

Rev. A | Page 12 of 32

TYPICAL PERFORMANCE CHARACTERISTICS

AVDD = DVDD = 5 V; OVDD = 5 V; VCC = 15 V; VEE = −15 V; VREF = 5 V; TA = 25°C.

CODE

2.5

2.0

1.5

1.0

0.5

–2.5

–2.0

–1.5

–1.0

–0.5

65536

131072

196608

262144

POSITIVE INL = 1.15 LSB

NEGATIVE INL = –0.94 LSB

fS = 250kSPS

Figure 5. Integral Nonlinearity vs. Code, Bipolar 10 V Range

INL DISTRIBUTION (LSB)

–2.0 –1.6 –1.2 –0.8 –0.4

0.4

0.8

1.2

1.6

2.0

NEGATIVE INL

POSITIVE INL

Figure 6. Integral Nonlinearity Distribution, Unipolar 10 V Range

(86 Devices)

70000

1FFFE

20008

CODE IN HEX

20000

20002

20004

20006

60000

50000

40000

20000

30000

10000

σ = 0.80

34164

2172

1997

32769

59925

Figure 7. Histogram of 261,120 Conversions of a DC Input

at the Code Center, Bipolar 5 V Range

CODE

2.5

2.0

1.5

1.0

0.5

–2.5

–2.0

–1.5

–1.0

–0.5

65536

131072

196608

262144

POSITIVE DNL = 0.68 LSB

NEGATIVE DNL = –0.75 LSB

fS = 250kSPS

Figure 8. Differential Nonlinearity vs. Code, Bipolar 10 V Range

DNL DISTRIBUTION (LSB)

–2.0 –1.6 –1.2 –0.8 –0.4

0.4

0.8

1.2

1.6

2.0

NEGATIVE DNL

POSITIVE DNL

Figure 9. Differential Nonlinearity Distribution, Bipolar 5 V Range

(86 Devices)

CODE IN HEX

20006

1FFFC

1FFFE

20000

20002

20004

60000

50000

40000

30000

20000

10000

σ = 0.75

56811

54874

005

6901

294

349

11838

Figure 10. Histogram of 261,120 Conversions of a DC Input

at the Code Transition, Bipolar 5 V Range

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