AD8305ACP-R2 Analog Devices Inc, AD8305ACP-R2 Datasheet - Page 8

• Manufacturer Part Number: AD8305ACP-R2
• Description: IC LOGARITHM CONV 100DB 16-LFCSP
• Manufacturer: Analog Devices Inc
• Type: Logarithmic Converterr

Specifications of AD8305ACP-R2

• Rohs Status: RoHS non-compliant
• Design Resources: Interfacing ADL5315 to Translinear Logarithmic Amplifier (CN0056) Interfacing ADL5317 High Side Current Mirror to a Translinear Logarithmic Amplifier in an Avalanche Photodiode Power Detector
• Applications: Fiber Optics
• Mounting Type: Surface Mount
• Package / Case: 16-LFCSP
• Other names: AD8305ACP-R2CT

AD8305
Figure 16. Small Signal AC Response (5% Sine Modulation), from I
Figure 17. Spot Noise Spectral Density at V
Figure 15. Small Signal AC Response (5% Sine Modulation), from I
0.01
–10
–20
–30
–40
–50
–10
–20
–30
–40
–50
100
0.1
10
10
10
(G = 1) for I
(G = 1) for I
0
0
1
100
100
100
1k
PD
1k
REF
1k
in Decade Steps from 10 nA to 1 mA, I
in Decade Steps from 10 nA to 1 mA, I
Decade Steps from 10 nA to 1 mA
10k
10k
10nA
10nA 100nA
FREQUENCY (Hz)
FREQUENCY (Hz)
FREQUENCY (Hz)
10k
100nA
1µA
10nA
100nA
100k
100k
1mA
1mA
1µA
1µA
100k
OUT
100µA
(G = 1) vs. Frequency for I
1M
1M
10µA
10µA
10µA
1M
10M
10M
REF
PD
100µA
100µA
= 10 μA
= 10 μA
100M
100M
10M
REF
PD
to V
to V
PD
OUT
Rev. B | Page 8 of 24
OUT
in
Figure 18. Small Signal AC Response of the Buffer for Various Closed-Loop
Figure 19. Buffer Input Offset Drift vs. Temperature (3σ to Either Side of
–12
–3
–6
–9
–0.5
–1.0
–1.5
–2.0
6
5
4
3
2
1
0
Figure 20. Total Wideband Noise Voltage at V
3
0
2.0
1.5
1.0
0.5
10k
10n
0
–40
–30
100n
–20
100k
–10
Gains (R
1µ
0
FREQUENCY (Hz)
MEAN + 3σ
MEAN – 3σ
TEMPERATURE (°C)
10
L
= 1 kΩ C
Mean)
I
PD
20
1M
10µ
A
(A)
V
A
30
= 5
V
= 2.5
L
< 2 pF)
40
100µ
50
10M
OUT
60
A
vs. I
1m
V
A
= 1
70
V
PD
= 2
(G = 1)
80
100M
10m
90