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參數資料
| 型號： | LMH6626MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Single/Dual Ultra Low Noise Wideband Operational Amplifier |
| 中文描述： | DUAL OP-AMP, 750 uV OFFSET-MAX, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數： | 17/20頁 |
| 文件大小： | 985K |
| 代理商： | LMH6626MMX |
Application Section
(Continued)
HIGH-GAIN SALLEN-KEY ACTIVE FILTERS
The LMH6624/LMH6626 are well suited for high gain Sallen-
Key type of active filters.
Figure 12
shows the 2
nd
order
Sallen-Key low pass filter topology. Using component predis-
tortion methods discussed in OA-21 enables the proper
selection of components for these high-frequency filters.
LOW NOISE MAGNETIC MEDIA EQUALIZER
The LMH6624/LMH6626 implement a high-performance low
noise equalizer for such application as magnetic tape chan-
nels as shown in
Figure 13
. The circuit combines an integra-
tor with a bandpass filter to produce the low noise equaliza-
tion. The circuit’s simulated frequency response is illustrated
in
Figure 14
.
LAYOUT CONSIDERATION
National Semiconductor suggests the copper patterns on the
evaluation boards listed below as a guide for high frequency
layout. These boards are also useful as an aid in device
testing and characterization. As is the case with all high-
speed amplifiers, accepted-practice RF design technique on
the PCB layout is mandatory. Generally, a good high fre-
quency layout exhibits a separation of power supply and
ground traces from the inverting input and output pins. Para-
sitic capacitances between these nodes and ground may
cause frequency response peaking and possible circuit os-
cillations (see Application Note OA-15 for more information).
Use high quality chip capacitors with values in the range of
1000pF to 0.1F for power supply bypassing. One terminal of
each chip capacitor is connected to the ground plane and the
other terminal is connected to a point that is as close as
possible to each supply pin as allowed by the manufacturer’s
design rules. In addition, connect a tantalum capacitor with a
value between 4.7μF and 10μF in parallel with the chip
capacitor. Signal lines connecting the feedback and gain
resistors should be as short as possible to minimize induc-
tance and microstrip line effect. Place input and output ter-
mination resistors as close as possible to the input/output
pins. Traces greater than 1 inch in length should be imped-
ance matched to the corresponding load termination.
20058929
FIGURE 11. Low Noise Integrator
20058930
FIGURE 12. Sallen-Key Active Filter Topology
20058931
FIGURE 13. Noise Magnetic Media Equalizer
20058932
FIGURE 14. Equalizer Frequency Response
L
www.national.com
17
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6626MMX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量: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 |
| LMH6628 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Wideband, Low Noise, Voltage Feedback Op Amp |
| LMH6628EP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Enhanced Plastic Dual Wideband, Low Noise, Voltage Feedback Op Amp |
| LMH6628JFQML | 制造商:Texas Instruments 功能描述:OP Amp Dual Volt Fdbk ±6V/12V 8-Pin CDIP Rail |
| LMH6628JFQMLV | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:DUAL WIDEBAND, LOW-NOISE, VOLTAGE FEEDBACK OP AMP, GUARANTEED TO 300k rd (si) TESTED TO MIL-STD-883, METHOD 1019 |
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