Datasheet

AD8646/AD8647/AD8648
Rev. D | Page 9 of 20
V
SY
= 2.7V
R
L
= 1k
C
L
= 10pF
40
20
60
0
100k 1M
80
–40
–20
10k 100M10M
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
90
135
45
180
0
270
225
OPEN-LOOP PHASE SHIFT (Degrees)
06527-016
Ф
M
= 52°
Figure 16. Open-Loop Gain and Phase vs. Frequency
60
–60
–40
0
–20
40
20
1k 10k 100k 1M 10M 100M
CLOSED-LOOP GAIN (dB)
FREQUENCY (Hz)
V
SY
= 2.7V
T
A
= 25°C
A
V
= 100
A
V
= 10
A
V
= 1
06527-017
Figure 17. Closed-Loop Gain vs. Frequency
250
0
50
150
100
200
1 10 100 1k 10k 1M100k
Z
OUT
()
FREQUENCY (kHz)
V
SY
= 2.7V
T
A
= 25°C
A
V
= 1
A
V
= 10
A
V
= 100
06527-018
Figure 18. Z
OUT
vs. Frequency
–40
–20
0
20
40
60
80
10k 100k 1M 10M 100M
FREQUENCY (Hz)
OPEN-LOOP GAIN (dB)
0
45
90
135
180
225
270
OPEN-LOOP PHASE SHIFT (Degrees)
V
SY
= 5V
R
L
= 1k
C
L
= 10pF
Ф
M
= 74°
PHASE
GAIN
06527-019
Figure 19. Open-Loop Gain and Phase vs. Frequency
60
–60
–40
0
–20
40
20
1k 10k 100k 1M 10M 100M
CLOSED-LOOP GAIN (dB)
FREQUENCY (Hz)
V
SY
= 5V
T
A
= 25°C
A
V
= 100
A
V
= 10
A
V
= 1
06527-020
Figure 20. Closed-Loop Gain vs. Frequency
120
0
20
80
60
40
100
1 10 100 1k 10k 1M100k
Z
OUT
()
FREQUENCY (kHz)
V
SY
= 5V
T
A
= 25°C
A
V
= 1
A
V
= 10
A
V
= 100
06527-021
Figure 21. Z
OUT
vs. Frequency