Datasheet

AD8305
Rev. B | Page 8 of 24
FREQUENCY (Hz)
10
–50
100
V
OUT
(V)
0
–10
–20
–30
–40
1k 10k 100k 1M 10M 100M
1µA
100µA
1mA
10nA
100nA
10µA
03053-015
Figure 15. Small Signal AC Response (5% Sine Modulation), from I
PD
to V
OUT
(G = 1) for I
PD
in Decade Steps from 10 nA to 1 mA, I
REF
= 10 μA
FREQUENCY (Hz)
100 1k 10k 100k 1M 10M 100M
10
–50
NORMALIZED RESPONSE (dB)
0
–10
–20
–30
–40
1µA
100µA
1mA
10nA
100nA
10µA
03053-016
Figure 16. Small Signal AC Response (5% Sine Modulation), from I
REF
to V
OUT
(G = 1) for I
REF
in Decade Steps from 10 nA to 1 mA, I
PD
= 10 μA
FREQUENCY (Hz)
10
100
(µV rms/
√
Hz)
1
100
0.1
0.01
1k 10k 100k 1M 10M
1µA
10µA
10nA
100nA
100µA
03053-017
Figure 17. Spot Noise Spectral Density at V
OUT
(G = 1) vs. Frequency for I
PD
in
Decade Steps from 10 nA to 1 mA
10k 100k 1M 10M 100M
FREQUENCY (Hz)
3
NORMALIZED RESPONSE (dB)
0
–3
–6
–9
–12
A
V
= 5
A
V
= 2.5
A
V
= 2
A
V
= 1
03053-018
Figure 18. Small Signal AC Response of the Buffer for Various Closed-Loop
Gains (R
L
= 1 kΩ C
L
< 2 pF)
TEMPERATURE (°C)
2.0
V
OS
DRIFT (mV)
1.5
1.0
0.5
0
–0.5
–1.0
–1.5
90806040200–20 10 30 50 70–10–30–40
–2.0
MEAN + 3σ
MEAN – 3σ
03053-019
Figure 19. Buffer Input Offset Drift vs. Temperature (3σ to Either Side of
Mean)
10n 100n 1µ 10µ 100µ 10m1m
I
PD
(A)
6
(mV rms)
5
4
3
2
1
0
0
3053-020
Figure 20. Total Wideband Noise Voltage at V
OUT
vs. I
PD
(G = 1)