TYPICAL PERFORMANCE CURVES: V
S
= +5V
G = +2, R
F
= 499Ω, R
L
= 100Ω to +2.5V, unless otherwise noted (see Figure 2).
SMALL-SIGNAL FREQUENCY RESPONSE
2
1
G = +2,
R
F
= 499Ω
LARGE-SIGNAL FREQUENCY RESPONSE
8
7
G = +2
R
L
= 100Ω to 2.5V
V
O
= 0.5Vp-p
Normalized Gain (1dB/div)
0
–1
–2
–3
–4
–5
–6
–7
–8
0
125
Gain (1dB/div)
G = +1,
R
F
= 649Ω
6
5
4
3
2
1
0
–1
–2
V
O
= 2Vp-p
V
O
= 1Vp-p
G = +5,
R
F
= 360Ω
G = +10,
R
F
= 200Ω
250
0
125
Frequency (25MHz/div)
250
Frequency (25MHz/div)
SMALL-SIGNAL PULSE RESPONSE
2.10
2.9
G = +2
V
O
= 0.5Vp-p
LARGE-SIGNAL PULSE RESPONSE
4.5
4.1
G = +2
V
O
= 2Vp-p
Output Voltage (400mV/div)
Output Voltage (100mV/div)
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
2.0
Time (5ns/div)
3.7
3.3
2.9
2.5
2.1
1.7
1.3
0.9
0.5
Time (5ns/div)
RECOMMENDED R
S
vs CAPACITIVE LOAD
70
60
50
15
FREQUENCY RESPONSE vs CAPACITIVE LOAD
Gain to Capacitive Load (3dB/div)
12
9
6
3
0
V
I
0.1µF
57.6Ω
806Ω
+5V
C
L
= 47pF
C
L
= 10pF
C
L
= 22pF
R
S
(Ω)
40
30
20
10
0
1
10
Capacitive Load (pF)
100
0.1µF
806Ω
R
S
C
L
499Ω
V
O
1kΩ
–3
–6
–9
499Ω
–12
–15
0
0.1µF
C
L
= 100pF
100MHz
200MHz
Frequency (20MHz/div)
®
9
OPA2681
BURR-BROWN [ BURR-BROWN CORPORATION ]
