Datasheet

AD8305
Rev. B | Page 7 of 24
I
REF
(A)
1.4
0
1n
V
LOG
(V)
1.2
1.0
0.8
0.6
0.4
0.2
10n 100n 1µ 10µ 100µ 1m 10m
1.6
1.8
10nA
100nA
1µA
10µA
100µA
1mA
03053-009
Figure 9. V
LOG
vs. I
REF
for Multiple Values of I
PD
(Decade Steps from
10 nA to 1 mA)
0.4
–0.3
E
R
R
OR; dB (10mV/dB)
0.3
0.2
0.1
0
–0.1
–0.2
0.5
+3V, 0V
–0.4
–0.5
+5V, 0V
+9V, 0V
+12V, 0V
+3V, –0.5V
+5V, –5V
I
PD
(A)
1n 10n 100n 1µ 10µ 100µ 1m 10m
03053-010
Figure 10. Law Conformance Error vs. I
PD
for Various Supply Conditions (See
Annotations)
0.4
–0.3
0.3
0.2
0.1
0
–0.1
–0.2
–0.4
I
PD
(A)
1n 10n 100n 1µ 10µ 100µ 1m 10m
V
SUM
–
V
INPT
(mV)
03053-011
Figure 11. V
INPT
− V
SUM
vs. I
PD
0.4
–0.3
E
R
R
OR; dB (10mV/dB)
0.3
0.2
0.1
0
–0.1
–0.2
0.5
–0.4
–0.5
10µA
100µA
1mA
10nA
100nA
1µA
I
REF
(A)
1n 10n 100n 1µ 10µ 100µ 1m 10m
03053-012
Figure 12. Law Conformance Error vs. I
REF
for Multiple Values of I
PD
(Decade
Steps from 10 nA to 1 mA)
TIME (µs)
1.4
180
V
OUT
(V)
1.2
1.0
0.8
0.6
0.4
0.2
0
160140120100806040200–20
100µATO 1mA:T-RISE = <1µs,
T- FA L L = < 1 µ s
10µA TO 10µA:T-RISE = <1µs,
T- FA L L = < 1 µ s
1µATO 10µA:T-RISE = 1µs,
T- FAL L = 5 µ s
100nA TO 1µA:T-RISE = 5µs,
T-FALL = 20µs
10nA TO 100nA:T-RISE = 20µs,
T- FA L L = 3 0µ s
03053-013
Figure 13. Pulse Response − I
PD
to V
OUT
(G = 1)
TIME (µs)
1.4
180
V
OUT
(V)
1.2
1.0
0.8
0.6
0.4
0.2
0
160140120100806040200–20
1.6
100µA TO 1mA:T-RISE = <1µs,
T- FA L L = < 1 µ s
10µA TO 100µA:T-RISE = 1µs,
T- FA L L = < 1 µ s
1µATO 10µA:T-RISE = 5µs,
T- FA L L = 1µ s
100nA TO 1µA:T-RISE = 30µs,
T- FA L L = 5 µ s
10nA TO 100nA:T-RISE = 30µs,
T-FALL = 20µs
03053-014
Figure 14. Pulse Response − I
REF
to V
OUT
(G = 1)