AD8305ACP-R2 Просмотр технического описания (PDF) - Analog Devices

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AD8305ACP-R2

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

Analog Devices 

AD8305

10

10nA 100nA

10µA

0

100µA

–10

–20

1mA

–30

1µA

–40

–50

100

1k

10k

100k

1M

10M

100M

FREQUENCY (Hz)

Figure 15. 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 µA

10

10nA 100nA

10µA

0

100µA

–10

–20

1mA

–30

1µA

–40

–50

100

1k

10k

100k

1M

10M

100M

FREQUENCY (Hz)

Figure 16. 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 µA

100

10nA

10

100nA

1

1µA

10µA

0.1

100µA

0.01

100

1k

10k

100k

1M

10M

FREQUENCY (Hz)

Figure 17. Spot Noise Spectral Density at VOUT (G = 1) vs. Frequency for IPD in

Decade Steps from 10 nA to 1 mA

3

0

–3

–6

–9

–12

10k

Data Sheet

AV = 5

AV = 2.5

AV = 1

AV = 2

100k

1M

10M

FREQUENCY (Hz)

100M

Figure 18. Small Signal AC Response of the Buffer for Various Closed-Loop

Gains (RL = 1 kΩ CL < 2 pF)

2.0

1.5

1.0

MEAN + 3σ

0.5

0

–0.5

MEAN – 3σ

–1.0

–1.5

–2.0

–40 –30 –20 –10 0 10 20 30 40 50 60 70 80 90

TEMPERATURE (°C)

Figure 19. Buffer Input Offset Drift vs. Temperature (3σ to Either

Side of Mean)

6

5

4

3

2

1

0

10n

100n

1µ

10µ

100µ

1m

10m

IPD (A)

Figure 20. Total Wideband Noise Voltage at VOUT vs. IPD (G = 1)

Rev. C | Page 8 of 24

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