Datasheet

AD8505/AD8506/AD8508
Rev. E | Page 9 of 20
T
A
= 25°C, unless otherwise noted.
120
100
80
60
40
20
0
–20
–40
–60
–80
–120
–100
120
100
80
60
40
20
0
–20
–40
–60
–80
–120
–100
100 1k 10k 100k 1M
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
PHASE (Degrees)
06900-022
GAIN
PHASE
GAIN, C
L
= 0pF
PHASE, C
L
= 0pF
GAIN, C
L
= 50pF
PHASE, C
L
= 50pF
GAIN, C
L
= 100pF
PHASE, C
L
= 100pF
V
SY
= 1.8V
Figure 25. Open-Loop Gain and Phase vs. Frequency
FREQUENCY (Hz)
CLOSED-LOOP GAIN (dB)
50
40
30
20
10
0
–10
–20
–30
–40
–50
100 1M
1k 10k 100k
V
SY
= 1.8V
G= –1
G= –10
G= –100
0
6900-017
Figure 26. Closed-Loop Gain vs. Frequency
10k
1k
100
10
1
0.1
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
Z
OUT
(Ω)
06900-028
V
SY
= 1.8V
G = 100
G = 10
G = 1
Figure 27. Z
OUT
vs. Frequency
120
100
80
60
40
20
0
–20
–40
–60
–80
–100
120
100
80
60
40
20
0
–20
–40
–60
–80
–100
100 1k 10k 100k 1M
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
PHASE (Degrees)
06900-025
GAIN
PHASE
GAIN, C
L
= 0pF
PHASE, C
L
= 0pF
GAIN, C
L
= 50pF
PHASE, C
L
= 50pF
GAIN, C
L
= 100pF
PHASE, C
L
= 100pF
V
SY
= 5V
Figure 28. Open-Loop Gain and Phase vs. Frequency
FREQUENCY (Hz)
CLOSED-LOOP GAIN (dB)
50
40
30
20
10
0
–10
–20
–30
–40
–50
100 1M
1k 10k 100k
V
SY
= 5V
0
6900-020
G= –1
G= –10
G= –100
Figure 29. Closed-Loop Gain vs. Frequency
10k
1k
100
10
1
0.1
0.01
10 100 1k 10k 100k 1M
FREQUENCY (Hz)
Z
OUT
(Ω)
06900-031
V
SY
= 5V
G = 100
G = 10
G = 1
Figure 30. Z
OUT
vs. Frequency