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參數(shù)資料
| 型號(hào)： | OPA3681U |
| 英文描述： | Triple Wideband, Current-Feedback OPERATIONAL AMPLIFIER With Disable |
| 中文描述： | 三寬帶，電流反饋運(yùn)算放大器，禁用 |
| 文件頁數(shù)： | 12/21頁 |
| 文件大?。?/td> | 234K |
| 代理商： | OPA3681U |
12
OPA3681
TRIPLE ADC BUFFER CHANNEL
The OPAx681 family is ideally suited to single supply,
wideband ADC driving. A current feedback op amp is ideal
where high gains with high bandwidths are required. The
wide 3Vp-p output swing with over 150MHz full power
bandwidth on a single +5V supply is well suited to the
2Vp-p input range commonly required from modern CMOS
pipelined ADCs. Three channels of very high speed digitizer
channels are shown in Figure 3 using the OPA3681 driving
three ADS831s (8-bit, 80Msps CMOS converters). Each
input is AC-coupled into a 50
gain resistor that also will
act as a 50
impedance match at high frequencies. The
amplifier’s inputs and outputs are centered on the ADC
common-mode input voltage by tying each converter’s V
CM
to the non-inverting inputs of the amplifier. This V
CM
acts as
the swing midpoint for the input to the converter. Since the
ADS831 can operate with differential inputs, driving into
the IN input will give a net non-inverting signal channel
even with the amplifiers operating at an inverting gain of
–6. The other input to the ADS831 is tied to this V
CM
as well
to give an input signal midpoint equal to V
CM
. The 300
feedback resistor will be the output load in this configura-
tion. Harmonic distortion for the OPA3681 will not degrade
the converter’s SFDR performance in this application.
WIDEBAND RGB MULTIPLEXER
The OPA3681 is ideally suited to implementing a simple,
very wideband, 2x1 RGB multiplexer. This simple “wired-
OR video multiplexer” can be easily implemented using the
circuit shown in Figure 4.
This circuit uses two OPA3681s where each package ac-
cepts the three RGB component video signals from one of
two possible sources. Each non-inverting input is terminated
FIGURE 3. ADC Driver.
FIGURE 4. Wideband 2x1 RGB Multiplexer.
1/3
OPA3681
22
300
50
0.1
μ
F
300
0.1
μ
F
47pF
V
1
ADS831
8-Bit
80Msps
IN
V
CM
IN
1/3
OPA3681
22
300
50
0.1
μ
F
300
0.1
μ
F
47pF
V
1
ADS831
8-Bit
80Msps
IN
V
CM
IN
1/3
OPA3681
22
300
50
0.1
μ
F
300
0.1
μ
F
47pF
V
1
ADS831
8-Bit
80Msps
IN
V
CM
IN
+5V
Power Supply
De-Coupling
Not Shown
1/3
OPA3681
340
402
75
82.5
V
OUT
Red
75
Line
R1
+5V
+5V
–5V
1/3
OPA3681
340
402
75
82.5
V
OUT
Green
75
Line
G1
1/3
OPA3681
340
402
75
82.5
V
OUT
Blue
75
Line
B1
1/3
OPA3681
340
402
75
82.5
R2
+5V
–5V
1/3
OPA3681
340
402
75
82.5
G2
1/3
OPA3681
340
402
75
82.5
B2
V
DIS
U1
U2
Power Supply
De-Coupling Not Shown
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| OPA3682 | Triple, Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA3681U/2K5 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| OPA3682 | 制造商:BB 制造商全稱:BB 功能描述:Triple, Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| OPA3682E | 制造商:BB 制造商全稱:BB 功能描述:Triple, Wideband, Fixed Gain BUFFER AMPLIFIER With Disable |
| OPA3682E/250 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Buffer/Voltage Follower |
| OPA3682E/2K5 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Buffer/Voltage Follower |
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