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參數(shù)資料
| 型號： | OPA3684IDR |
| 英文描述： | Operational Amplifier |
| 中文描述： | 運算放大器 |
| 文件頁數(shù)： | 15/25頁 |
| 文件大?。?/td> | 448K |
| 代理商： | OPA3684IDR |
OPA3684
SBOS241A
15
www.ti.com
WIDEBAND PGA FOR ADC DRIVING
Using the 3 channels of the OPA3684, and the shutdown
feature, can give an easy to use PGA function
—
which can
be applied to driving an ADC. Since the bandwidth does not
vary with gain for the CFB
PLUS
OPA3684, each channel can
be set up to a desired gain setting, with each of the
noninverting inputs driven with the same input signal. Select-
ing one of the 3 channels passes on the input with the gain
setting provided by the selected channel. Figure 8 shows an
example where the channels are set to gains of 2, 5, and 10.
Again, the output signal will be divided down back to the
inverting inputs of the inactive channels. To retain good pulse
fidelity, or low distortion, this divided down output signal at
the inverting inputs of the OFF channels, plus the OFF
channel input signals, should not exceed 0.7Vp-p. As the
signal across the buffers of the inactive channels exceeds
412
243
82.5
806
100pF
56pF
220pF
+5V
402
237
97.6
806
1/3
OPA3684
100pF
56pF
220pF
+5V
75.5
1/3
OPA3684
806
100
μ
F
953
+5V
1/3
OPA3684
953
806
806
120pF
100
μ
F
V
O
Video
In
+5V
0.7Vp-p, diodes across the inputs begin to turn on causing a
nonlinear load to the active channel. This will degrade signal
fidelity under those conditions.
VIDEO DAC RECONSTRUCTION FILTER
Wideband current-feedback op amps make ideal elements
for implementing high-speed active filters where the amplifier
is used as a fixed gain block inside a passive RC circuit
network. The triple channel OPA3684 can be used as a very
effective video Digital-to-Analog Converter (DAC) recon-
struction filter and line driver. Figure 9 shows an example of
this where the delay-equalized filter compensates for the
DAC
’
s sin(x)/x response, and minimizes aliasing artifacts. It
is shown here as a single +5V design expecting a 13.5MSPS
DAC sampling rate, and giving a 5.5MHz cutoff frequency.
FIGURE 8. Wideband PGA for ADC Driving.
1/3
OPA3684
20
806
806
G = +2
1/3
OPA3684
200
200
806
G = +5
1/3
OPA3684
20
90.9
806
G = +10
74HC238
–
5V
+5V
Power-supply
decoupling not shown.
V
IN
+5V
D
1
D
2
Y
0
Y
1
Y
2
50
100
100
100
ADS826
10-Bit
60MSPS
0.1
μ
F
0.1
μ
F
4.99k
0.1
μ
F
4.99k
0.1
μ
F
100pF
REFT
+3.5V
REFB
+1.5V
+In
–
In
CM
FIGURE 9. Composite Video Filter.
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|---|---|
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| OPA3690IDR | OP-AMP|TRIPLE|BIPOLAR|SOP|16PIN|PLASTIC |
| OPA3691ID | Current-Feedback Operational Amplifier |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| OPA3684IDRG4 | 功能描述:高速運算放大器 Low-Power Triple Current Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| OPA369 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.8V, 700nA, Zer?-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER |
| OPA369_1 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:1.8V, 700nA, Zer?-Crossover RAIL-TO-RAIL I/O OPERATIONAL AMPLIFIER |
| OPA3690 | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Dual, Wideband, High Output Current, Operational Amplifier with Current Limit |
| OPA3690ID | 功能描述:高速運算放大器 Triple Wideband Voltage-Feedback RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
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