AD8305 datasheet(5/20 Pages) AD

Part #	AD8305

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

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REV. A

AD8305

–5–

IREF – A

1.4

0

1n

1.2

1.0

0.8

0.6

0.4

0.2

10n

100n

1

10

100

1m

10m

1.6

1.8

10nA

100nA

1 A

10 A

100 A

1mA

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

(Decade Steps from 10 nA to 1 mA)

IPD – A

0.4

–0.3

1n

0.3

0.2

0.1

0

–0.1

–0.2

10n

100n

1

10

100

1m

10m

0.5

+3V, 0V

–0.4

–0.5

+5V, 0V

+9V, 0V

+12V, 0V

+3V, –0.5V

+5V, –5V

TPC 8. Law Conformance Error vs. IPD for Various

Supply Conditions (see Annotations)

IPD – A

0.4

–0.3

1n

0.3

0.2

0.1

0

–0.1

–0.2

10n

100n

1

10

100

1m

10m

–0.4

TPC 9. VINPT – VSUM vs. IPD

IREF – A

0.4

–0.3

1n

0.3

0.2

0.1

0

–0.1

–0.2

10n

100n

1

10

100

1m

10m

0.5

–0.4

–0.5

10 A

100 A

1mA

10nA

100nA

1 A

TPC 10. Law Conformance Error vs. IREF for Multiple

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

TIME –

s

1.4

180

1.2

1.0

0.8

0.6

0.4

0.2

0

160

140

120

100

80

60

40

20

0

–20

100 A TO 1mA:T-RISE = <1 s,

T-FALL = < 1 s

10 A TO 10 A:T-RISE = <1 s,

T-FALL = < 1 s

1 ATO 10 A:T-RISE = 1 s,

T-FALL = 5 s

100nA TO 1 A:T-RISE = 5 s,

T-FALL = 20 s

10nA TO 100nA:T-RISE = 20 s,

T-FALL = 30 s

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

TIME –

s

1.4

180

100 A TO 1mA: T-RISE = < 1 s,

T-FALL = < 1 s

1 A TO 10 A:T-RISE = 5 s,

T-FALL = < 1 s

10 A TO 100 A: T-RISE = 1 s,

T-FALL = < 1 s

100nA TO 1 A:T-RISE = 30 s,

T-FALL = 5 s

10nA TO 100nA:T-RISE = 30 s,

T-FALL = 20 s

1.2

1.0

0.8

0.6

0.4

0.2

0

160

140

120

100

80

60

40

20

0

–20

1.6

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

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