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參數(shù)資料
| 型號： | LMH6551MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Differential, High Speed Op Amp |
| 中文描述： | OP-AMP, 6000 uV OFFSET-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數(shù)： | 15/19頁 |
| 文件大?。?/td> | 935K |
| 代理商： | LMH6551MMX |
Application Section
(Continued)
The amplifier and ADC should be located as closely together
as possible. Both devices require that the filter components
be in close proximity to them. The amplifier needs to have
minimal parasitic loading on the output traces and theADC is
sensitive to high frequency noise that may couple in on its
input lines. Some high performance ADCs have an input
stage that has a bandwidth of several times its sample rate.
The sampling process results in all input signals presented
to the input stage mixing down into the Nyquist range (DC to
Fs/2). See AN-236 for more details on the subsampling
process and the requirements this imposes on the filtering
necessary in your system.
USING TRANSFORMERS
Transformers are useful for impedance transformation as
well as for single to differential, and differential to single
ended conversion. A transformer can be used to step up the
output voltage of the amplifier to drive very high impedance
loads as shown in
Figure 9
.
Figure 11
shows the opposite
case where the output voltage is stepped down to drive a low
impedance load.
Transformers have limitations that must be considered be-
fore choosing to use one. Compared to a differential ampli-
fier, the most serious limitations of a transformer are the
inability to pass DC and balance error (which causes distor-
tion and gain errors). For most applications the LMH6551 will
have adequate output swing and drive current and a trans-
former will not be desirable. Transformers are used primarily
to interface differential circuits to 50
single ended test
equipment to simplify diagnostic testing.
20133205
FIGURE 8. Driving an ADC
20133207
FIGURE 9. Transformer Out High Impedance Load
20133232
FIGURE 10. Calculating Transformer Circuit Net Gain
L
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6551MMX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6551Q | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Differential, High Speed Op Amp |
| LMH6551QMM | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Differential, High Speed Op Amp |
| LMH6551QMM/NOPB | 功能描述:差分放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 Channel 帶寬:2.4 GHz 可用增益調整:6 dB to 26 dB 輸入補償電壓: 共模抑制比（最小值）:- 40 dB 工作電源電壓:4.75 V to 5.25 V 電源電流:100 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:WQFN-24 封裝:Reel |
| LMH6551QMME | 制造商:TI 制造商全稱:Texas Instruments 功能描述:Differential, High Speed Op Amp |
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