Datasheet

TLC225x, TLC225xA
Advanced LinCMOS RAIL-TO-RAIL
VERY LOW-POWER OPERATIONAL AMPLIFIERS
SLOS176D – FEBRUARY 1997 – REVISED MARCH 2001
45
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
TYPICAL CHARACTERISTICS
Figure 56
om – Phase Margin
PHASE MARGIN
vs
LOAD CAPACITANCE
C
L
– Load Capacitance – pF
m
φ
10
1
10
2
10
3
10
5
75°
60°
45°
30°
15°
0°
R
null
= 200 Ω
R
null
= 500 Ω
R
null
= 50 Ω
R
null
= 0
T
A
= 25°C
R
null
= 10 Ω
10
4
50 kΩ
50 kΩ
V
DD –
V
DD +
R
null
C
L
V
I
+
–
R
null
= 100 Ω
Figure 57
Gain Margin – dB
GAIN MARGIN
vs
LOAD CAPACITANCE
C
L
– Load Capacitance – pF
20
10
5
0
15
10
1
10
2
10
3
10
5
R
null
= 100 Ω
T
A
= 25°C
R
null
= 50 Ω
10
4
R
null
= 500 Ω
R
null
= 200 Ω
R
null
= 0
R
null
= 10 Ω
Figure 58
– Unity-Gain Bandwidth – kHz
UNITY-GAIN BANDWIDTH
†
vs
LOAD CAPACITANCE
C
L
– Load Capacitance – pF
B
1
150
25
100
0
200
125
175
50
75
10
1
10
2
10
3
10
4
10
5
T
A
= 25°C
Figure 59
Overestimation of Phase Margin
OVERESTIMATION OF PHASE MARGIN
†
vs
LOAD CAPACITANCE
C
L
– Load Capacitance – pF
15
10
5
0
20
25
10
1
10
2
10
3
10
4
10
5
T
A
= 25°C
R
null
= 100 Ω
R
null
= 50 Ω
R
null
= 10 Ω
R
null
= 500 Ω
R
null
= 200 Ω
†
See application information