AD8305-EVAL(2003) Просмотр технического описания (PDF) - Analog Devices

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AD8305-EVAL
(Rev.:2003)

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

Analog Devices 

AD8305

10

10nA 100nA

10␮A

0

100␮A

–10

–20

1mA

–30

1␮A

–40

–50

100

1k

10k

100k

1M

10M 100M

FREQUENCY – Hz

TPC 13. Small Signal AC Response (5% Sine

Modulation), from IPD to VOUT (G = 1) for IPD in

Decade Steps from 10 nA to 1 mA, IREF = 10 mA

10

10nA 100nA

10␮A

0

100␮A

–10

–20

1mA

–30

1␮A

–40

–50

100

1k

10k

100k

1M

10M

100M

FREQUENCY – Hz

TPC 14. Small Signal AC Response (5% Sine

Modulation), from IREF to VOUT (G = 1) for IREF in

Decade Steps from 10 nA to 1 mA, IPD = 10 mA

100

10nA

10

100nA

1

1␮A

10␮A

0.1

100␮A

0.01

100

1k

10k

100k

1M

10M

FREQUENCY – Hz

TPC 15. Spot Noise Spectral Density at VOUT

(G = 1) vs. Frequency for IPD in Decade Steps from

10 nA to 1 mA

3

0

AV = 1

–3

AV = 2

AV = 5

–6

AV = 2.5

–9

–12

10k

100k

1M

10M

FREQUENCY – Hz

100M

TPC 16. Small Signal AC Response of the Buffer for

Various Closed-Loop Gains (RL = 1 kW CL < 2 pF)

2.0

1.5

1.0

MEAN + 3␴

0.5

0

–0.5

MEAN – 3␴

–1.0

–1.5

–2.0

–40 –30 –20 –10

0 10 20 30 40 50 60 70 80 90

TEMPERATURE – ؇C

TPC 17. Buffer Input Offset Drift vs. Temperature

(3␴ to Either Side of Mean)

6

5

4

3

2

1

0

10n

100n

1␮

10␮

100␮

IPD – A

1m

10m

TPC 18. Total Wideband Noise Voltage

at VOUT vs. IPD (G = 1)

–6–

REV. A

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