AD8305ACPZ datasheet(7/24 Pages) AD

Teilenummer	AD8305ACPZ

Bauteilbeschribung	100 dB Range (10 nA to 1 mA) ogarithmic Converter

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AD8305

Rev. B | Page 7 of 24

IREF (A)

1.4

0

1n

1.2

1.0

0.8

0.6

0.4

0.2

10n

100n

1µ

10µ

100µ

1m

10m

1.6

1.8

10nA

100nA

1µA

10µA

100µA

1mA

Figure 9. VLOG vs. IREF for Multiple Values of IPD (Decade Steps from

10 nA to 1 mA)

0.4

–0.3

0.3

0.2

0.1

0

–0.1

–0.2

0.5

+3V, 0V

–0.4

–0.5

+5V, 0V

+9V, 0V

+12V, 0V

+3V, –0.5V

+5V, –5V

IPD (A)

1n

10n

100n

1µ

10µ

100µ

1m

10m

Figure 10. Law Conformance Error vs. IPD for Various Supply Conditions (See

Annotations)

0.4

–0.3

0.3

0.2

0.1

0

–0.1

–0.2

–0.4

IPD (A)

1n

10n

100n

1µ

10µ

100µ

1m

10m

Figure 11. VINPT − VSUM vs. IPD

0.4

–0.3

0.3

0.2

0.1

0

–0.1

–0.2

0.5

–0.4

–0.5

10µA

100µA

1mA

10nA

100nA

1µA

IREF (A)

1n

10n

100n

1µ

10µ

100µ

1m

10m

Figure 12. Law Conformance Error vs. IREF for Multiple Values of IPD (Decade

Steps from 10 nA to 1 mA)

TIME (µs)

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

100µA TO 1mA:T-RISE = <1µs,

T-FALL = < 1µs

10µA TO 10µA:T-RISE = <1µs,

T-FALL = < 1µs

1µATO 10µA:T-RISE = 1µs,

T-FALL = 5µs

100nA TO 1µA:T-RISE = 5µs,

T-FALL = 20µs

10nA TO 100nA:T-RISE = 20µs,

T-FALL = 30µs

Figure 13. Pulse Response − IPD to VOUT (G = 1)

TIME (µs)

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

1.6

100µA TO 1mA:T-RISE = <1µs,

T-FALL = < 1µs

10µA TO 100µA:T-RISE = 1µs,

T-FALL = < 1µs

1µATO 10µA:T-RISE = 5µs,

T-FALL = 1µs

100nA TO 1µA:T-RISE = 30µs,

T-FALL = 5µs

10nA TO 100nA:T-RISE = 30µs,

T-FALL = 20µs

Figure 14. Pulse Response − IREF to VOUT (G = 1)

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