AD8305 Analog Devices, AD8305 Datasheet - Page 6

• Manufacturer Part Number: AD8305
• Description: 100 Db-range (10nA-1mA) Logarithmic Converter
• Manufacturer: Analog Devices

AD8305
TPC 13. Small Signal AC Response (5% Sine
Modulation), from I
Decade Steps from 10 nA to 1 mA, I
TPC 14. Small Signal AC Response (5% Sine
Modulation), from I
Decade Steps from 10 nA to 1 mA, I
TPC 15. Spot Noise Spectral Density at V
(G = 1) vs. Frequency for I
10 nA to 1 mA
0.01
–10
–20
–30
–40
–50
–50
–10
–20
–30
–40
100
0.1
10
10
10
0
0
1
100
100
100
1k
1k
1k
10k
10k
10nA
10nA 100nA
FREQUENCY – Hz
FREQUENCY – Hz
FREQUENCY – Hz
PD
REF
10k
100nA
to V
10nA
1 A
100nA
to V
100k
100k
1mA
1mA
PD
OUT
1 A
1 A
OUT
100k
100 A
in Decade Steps from
(G = 1) for I
(G = 1) for I
1M
1M
10 A
10 A
10 A
REF
PD
1M
10M
10M
= 10 m A
= 10 m A
100 A
100 A
PD
OUT
REF
in
100M
100M
in
10M
–6–
TPC 16. Small Signal AC Response of the Buffer for
Various Closed-Loop Gains (R
TPC 17. Buffer Input Offset Drift vs. Temperature
(3 to Either Side of Mean)
–0.5
–1.0
–1.5
–2.0
2.0
1.5
1.0
0.5
–12
–3
–6
–9
4
0
0
6
5
3
2
1
–40
3
0
10n
10k
TPC 18. Total Wideband Noise Voltage
at V
–30
OUT
–20
100n
vs. I
–10
100k
PD
0
1
(G = 1)
MEAN + 3
MEAN – 3
TEMPERATURE – C
10
FREQUENCY – Hz
20
I
PD
10
1M
– A
30
A
V
A
V
= 5
L
40
= 2.5
= 1 k W C
100
50
10M
60
L
A
1m
70
< 2 pF)
V
A
= 1
V
80
= 2
100M
10m
90
REV. A