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OPA685 Datasheet(PDF) 11 Page - Texas Instruments

Part # OPA685
Description  Ultra-Wideband, Current-Feedback OPERATIONAL AMPLIFIER
PDF  32 Pages
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Manufacturer  TI1 [Texas Instruments]
Direct Link  http://www.ti.com
Logo TI1 - Texas Instruments

OPA685 Datasheet(HTML) 11 Page - Texas Instruments

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OPA685
TYPICAL PERFORMANCE CURVES: VS = +5V
G = +8, RF = 348Ω, and RL = 100Ω, unless otherwise noted.
70
60
50
40
30
20
10
0
RECOMMENDED R
S vs CAPACITIVE LOAD
Capacitive Load (pF)
10
100
OPA685
348
Ω
35.7
Ω
52.3
Ω
2.5k
Ω
2.5k
Ω
1k
Ω
VI
+5V
0.1
µF
1k
Ω load is optional
VO
RS
CL
0.1
µF
24
21
18
15
12
9
6
3
0
–3
–6
Frequency (50MHz/div)
0
500MHz
250MHz
FREQUENCY RESPONSE vs CAPACITIVE LOAD
C
L = 10pF
C
L = 100pF
Optimized R
S
C
L = 20pF
C
L = 47pF
6
3
0
–3
–6
–9
–12
–15
–18
–21
–24
Frequency (100MHz/div)
0
1GHz
500MHz
NON-INVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
G = +8, R
F = 348Ω
G = +4, R
F = 442Ω
G = +16, R
F = 162Ω
See Figure 3
G = +2, R
F = 487Ω
V
O = 500mVp-p
NON-INVERTING PULSE RESPONSE
Time (2ns/div)
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
G = +8
R
L = 100Ω
R
F = 348Ω
Output
Input
See Figure 3
V
O =2Vp-p
6
3
0
–3
–6
–9
–12
–15
–18
–21
–24
Frequency (100MHz/div)
0
1GHz
500MHz
INVERTING SMALL-SIGNAL
FREQUENCY RESPONSE
G = –2, R
F = 464Ω
G = –16, R
F = 806Ω
G = –8, R
F = 402Ω
G = –4, R
F = 432Ω
See Figure 4
V
O = 500mVp-p
INVERTING PULSE RESPONSE
Time (2ns/div)
1.6
1.2
0.8
0.4
0
–0.4
–0.8
–1.2
–1.6
G = –8
R
L = 100Ω
R
F = 402Ω
Output
Input
See Figure 4
V
O = 2Vp-p



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