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參數(shù)資料
| 型號： | OPA3680U |
| 英文描述： | Triple, Wideband, Voltage-Feedback OPERATIONAL AMPLIFIER With Disable |
| 中文描述： | 三，寬帶，電壓反饋運算放大器，禁用 |
| 文件頁數(shù)： | 13/21頁 |
| 文件大?。?/td> | 225K |
| 代理商： | OPA3680U |
13
OPA3680
FIGURE 5. Buffered 2-to-1 MUX.
FIGURE 6. Triple ADC Driver.
FIGURE 7. Wideband Integrator.
1/3
OPA3680
Video1
Video2
100
100
49.9
49.9
75
402
249
75
100
100
2k
–5V
+5V
+5V
374
75
DIS
1/3
OPA3680
2k
402
–5V
+5V
DIS
V
DIS
1/3
OPA3680
–5V
+5V
DIS
1/3
OPA3680
V
1
249
249
124
24.9
100pF
1/3
OPA3680
V
2
249
249
124
24.9
100pF
1/3
OPA3680
V
3
249
249
124
24.9
100pF
Triple
ADC
V
IN
V
OUT
50
50
1/3
OPA3680
25
1/3
OPA3680
R
50
1/3
OPA3680
75
150
C
TRIPLE ADC DRIVER
Figure 6 shows the OPA3680 driving a triple ADC. Most
ADC’s are defined for single +5V operation. The OPA3680
can be adapted to single +5V as well using the techniques
described for Figure 2. The signal flowthrough pinout for the
OPA3680 allows a higher signal fidelity through higher
frequencies due to the simplified PC layout requirements.
WIDEBAND INTEGRATOR
The three unity-gain stable, voltage-feedback amplifiers in
the OPA3680 may be used to develop an exceptional inte-
grator function, as shown in Figure 7. This circuit effectively
multiplies the open-loop gain using two of the amplifiers
and uses the 3rd to provide an input impedance buffering
and low output impedance over broad frequencies required
for proper operation. The interstage attenuator (resistive
divider into the last stage non-inverting input) shown in
Figure 6 is critical to maintaining stability. This circuit can
deliver a 90
°
phase shift over a 5-decade frequency span.
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