Datasheet

AD8538/AD8539 Data Sheet
Rev. B | Page 16 of 24
06741-047
1000
900
800
700
600
500
400
300
200
100
0.01
Z
OUT
(Ω)
100
1k
10k 100k
1M 10M
FREQUENCY (Hz)
AD8539
V
SY
= ±2.5V
A
V
= 100
A
V
= 10
A
V
= 1
Figure 46. AD8539 Closed-Loop Output Impedance vs. Frequency
06741-048
60
50
40
30
20
10
0
OVERSHOOT (%)
1 10 100 1k
CAPACITANCE (pF)
OS–
OS+
AD8539
V
SY
= ±2.5V
R
L
= 2kΩ
Figure 47. AD8539 Small Signal Overshoot vs. Load Capacitance
06741-049
TIME (2µs/DIV)
VOLTAGE (50mV/DIV)
AD8539
V
SY
= 5V
A
V
= 1
C
L
= 300pF
R
L
= 2kΩ
Figure 48. AD8539 Small Signal Transient Response
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TIME (4µs/DIV)
VOLTAGE (1V/DIV)
AD8539
V
SY
= 5V
A
V
= 1
C
L
= 300pF
R
L
= 10kΩ
Figure 49. AD8539 Large Signal Transient Response
06741-051
INPUT VOLTAGE
OUTPUT VOLTAGE
AD8539
V
SY
= ±2.5V
A
V
= –50
0.15
0.10
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
INPUT VOLTAGE (50mV/DIV)
5
4
3
2
1
0
–1
–2
–3
OUTPUT VOLTAGE (1V/DIV)
TIME (20µs/DIV)
Figure 50. AD8539 Positive Overload Recovery
06741-052
INPUT VOLTAGE
OUTPUT VOLTAGE
AD8539
V
SY
= ±2.5V
A
V
= –50
0.05
0
–0.05
–0.10
–0.15
–0.20
–0.25
–0.30
–0.35
INPUT VOLTAGE (50mV/DIV)
7.5
6.5
5.5
4.5
3.5
2.5
1.5
0.5
–0.5
OUTPUT VOLTAGE (5V/DIV)
TIME (20µs/DIV)
Figure 51. AD8539 Negative Overload Recovery