AD8305(2003) 데이터 시트보기 (PDF) - Analog Devices

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AD8305
(Rev.:2003)

100 dB Range (10 nA to 1 mA) Logarithmic Converter

Analog Devices 

1.8

1.6

1.4

1.2

1.0

1mA

0.8

100␮A

10␮A

0.6

1␮A

100nA

0.4

10nA

0.2

0

1n

10n 100n 1␮

10␮ 100␮

1m

10m

IREF – A

TPC 7. VLOG vs. IREF for Multiple Values of IPD

(Decade Steps from 10 nA to 1 mA)

0.5

+3V, 0V

0.4

+5V, 0V

0.3

+9V, 0V

0.2

+12V, 0V

0.1

0

–0.1

+3V, –0.5V

–0.2

+5V, –5V

–0.3

–0.4

–0.5

1n

10n 100n

1␮

10␮ 100␮ 1m

IPD – A

10m

TPC 8. Law Conformance Error vs. IPD for Various

Supply Conditions (see Annotations)

0.4

0.3

0.2

0.1

0

–0.1

–0.2

–0.3

–0.4

1n

10n 100n

1␮

10␮ 100␮ 1m 10m

IPD – A

TPC 9. VINPT – VSUM vs. IPD

AD8305

0.5

0.4

0.3

10␮A

0.2

10nA 100nA

1␮A

0.1

0

–0.1

–0.2

100␮A 1mA

–0.3

–0.4

–0.5

1n

10n 100n

1␮

10␮ 100␮ 1m

IREF – A

10m

TPC 10. Law Conformance Error vs. IREF for Multiple

Values of IPD (Decade Steps from 10 nA to 1 mA)

1.4

1.2

100␮A TO 1mA:T-RISE = <1␮s,

T-FALL = < 1␮s

1.0

10␮A TO 10␮A:T-RISE = <1␮s,

T-FALL = < 1␮s

0.8

1␮A TO 10␮A: T-RISE = 1␮s,

T-FALL = 5␮s

0.6

100nA TO 1␮A: T-RISE = 5␮s,

T-FALL = 20␮s

0.4

10nA TO 100nA: T-RISE = 20␮s,

T-FALL = 30␮s

0.2

0

–20 0 20 40 60 80 100 120 140 160 180

TIME – ␮s

TPC 11. Pulse Response – IPD to VOUT (G = 1)

1.6

1.4

10nA TO 100nA: T-RISE = 30␮s,

T-FALL = 20␮s

1.2

100nA TO 1␮A: T-RISE = 30␮s,

T-FALL = 5␮s

1.0

1␮A TO 10␮A: T-RISE = 5␮s,

T-FALL = < 1␮s

0.8

10␮A TO 100␮A: T-RISE = 1␮s,

T-FALL = < 1␮s

0.6

100␮A TO 1mA: T-RISE = < 1␮s,

T-FALL = < 1␮s

0.4

0.2

0

–20 0 20 40 60 80 100 120 140 160 180

TIME – ␮s

TPC 12. Pulse Response – IREF to VOUT (G = 1)

REV. A

–5–

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