TYPICAL PERFORMANCE CURVES: VS = +5V
G = +2, RF = 499Ω, and RL = 100Ω to +2.5V, unless otherwise noted (see Figure 2).
LARGE-SIGNAL FREQUENCY RESPONSE
SMALL-SIGNAL FREQUENCY RESPONSE
8
7
2
1
G = +2
RL = 100Ω to 2.5V
VO = 0.5Vp-p
G = +2,
RF = 499Ω
6
0
G = +1,
VO = 1Vp-p
5
R
F = 649Ω
–1
–2
–3
–4
–5
–6
–7
–8
4
VO = 2Vp-p
3
G = +5,
RF = 360Ω
2
1
G = +10,
RF = 200Ω
0
–1
–2
0
125
Frequency (25MHz/div)
250
0
125
Frequency (25MHz/div)
250
SMALL-SIGNAL PULSE RESPONSE
LARGE-SIGNAL PULSE RESPONSE
4.5
4.1
3.7
3.3
2.9
2.5
2.1
1.7
1.3
0.9
0.5
2.10
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
G = +2
G = +2
O = 2Vp-p
VO = 0.5Vp-p
V
Time (5ns/div)
Time (5ns/div)
RECOMMENDED RS vs CAPACITIVE LOAD
FREQUENCY RESPONSE vs CAPACITIVE LOAD
70
60
50
40
30
20
10
0
15
12
9
CL = 10pF
CL = 47pF
CL = 22pF
6
+5V
3
806Ω
0.1µF
0
V
I
V
O
–3
–6
–9
–12
–15
OPA681
806Ω
57.6Ω
R
S
C
L
1kΩ
499Ω
499Ω
0.1µF
1kΩ is optional.
CL = 100pF
1
10
100
0
100MHz
200MHz
Capacitive Load (pF)
Frequency (20MHz/div)
®
9
OPA681
BB [ BURR-BROWN CORPORATION ]
