Datasheet

OPA691
9
SBOS226D
www.ti.com
TYPICAL CHARACTERISTICS: V
S
= +5V
G = +2, R
F
= 453Ω, and R
L
= 100Ω to +2.5V, unless otherwise noted (see Figure 2).
2.9
2.8
2.7
2.6
2.5
2.4
2.3
2.2
2.1
SMALL-SIGNAL PULSE RESPONSE
Time (5ns/div)
Output Voltage (100mV/div)
G = +2
V
O
= 0.5Vp-p
4.1
3.7
3.3
2.9
2.5
2.1
1.7
1.3
0.9
LARGE-SIGNAL PULSE RESPONSE
Time (5ns/div)
Output Voltage (400mV/div)
G = +2
V
O
= 2Vp-p
60
50
40
30
20
10
0
RECOMMENDED R
S
vs CAPACITIVE LOAD
Capacitive Load (pF)
1 10 100
R
S
(Ω)
9
6
3
0
–3
–6
–9
FREQUENCY RESPONSE vs CAPACITIVE LOAD
Frequency (25MHz/div)
0 250MHz125MHz
Normalized Gain to Capacitive Load (dB)
C
L
= 22pF
C
L
= 10pF
C
L
= 47pF
C
L
= 100pF
OPA691
453Ω
453Ω
57.6Ω 806Ω
806Ω
1kΩ
V
I
+5V
0.1µF
V
O
R
S
C
L
0.1µF
1kΩ is optional.
7.0
6.5
6.0
5.5
5.0
4.5
4.0
3.5
3.0
2.5
2.0
Frequency (25MHz/div)
0 250MHz125MHz
LARGE-SIGNAL FREQUENCY RESPONSE
Gain (0.5dB/div)
V
O
= 0.5Vp-p
V
O
= 2Vp-p
G = +2
R
L
= 100Ω to 2.5V
V
O
= 1Vp-p
1
0
–1
–2
–3
–4
–5
–6
–7
–8
Frequency (25MHz/div)
0 250MHz125MHz
SMALL-SIGNAL FREQUENCY RESPONSE
Normalized Gain (1dB/div)
G = +2,
R
F
= 453Ω
G = +10,
R
F
= 180Ω
G = +5,
R
F
= 340Ω
G = +1,
R
F
= 499Ω
V
O
= 0.5Vp-p