Datasheet

AD8231
Rev. B | Page 15 of 24
OPERATIONAL AMPLIFIER PERFORMANCE CURVES
100
80
60
40
20
0
–20
–
90
–100
–110
–120
–130
–140
–150
10 10M1M100k10k1k100
OPEN-LOOP GAIN (dB)
OPEN-LOOP PHASE SHIFT (Degrees)
FREQUENCY (Hz)
R
L
= 10kΩ
C
L
= 200pF
76° PHASE
MARGIN
06586-021
Figure 35. Operational Amplifier Open-Loop Gain and Phase vs.
Frequency, V
S
= 5 V
100
80
60
40
20
0
–20
–
90
–100
–110
–120
–130
–140
–150
10 10M1M100k10k1k100
OPEN-LOOP GAIN (dB)
OPEN-LOOP PHASE SHIFT (Degrees)
FREQUENCY (Hz)
R
L
= 10kΩ
C
L
= 200pF
72° PHASE
MARGIN
06586-022
Figure 36. Operational Amplifier Open-Loop Gain and Phase vs.
Frequency, V
S
= 3 V
NO
LOAD
800pF
1nF
1.5nF
2nF
5µs/DIV20mV/DIV
06586-023
Figure 37. Operational Amplifier Small Signal Response for
Various Capacitive Loads, V
S
= 5 V
NO
LOAD
300pF
800pF
1nF
1.5nF
5µs/DIV20mV/DIV
06586-024
Figure 38. Operational Amplifier Small Signal Response for
Various Capacitive Loads, V
S
= 3 V
NO
LOAD
1nF║2kΩ
1.5nF║2kΩ
TIME (5µs/DIV)
OUTPUT VOLTAGE (0.5V/DIV)
06586-025
Figure 39. Operational Amplifier Large Signal Transient Response, V
S
= 5 V
NO
LOAD
1nF║2kΩ
1.5nF║2kΩ
TIME (5µs/DIV)
OUTPUT VOLTAGE (0.5V/DIV)
06586-026
Figure 40. Operational Amplifier Large Signal Transient Response, V
S
= 3 V