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參數資料
| 型號： | LMH6622MMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | Dual Wideband, Low Noise, 160MHz, Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, PDSO8 |
| 封裝： | MSOP-8 |
| 文件頁數： | 16/18頁 |
| 文件大小： | 540K |
| 代理商： | LMH6622MMX |
DSL Receive Channel Applications
(Continued)
Circuit Layout Considerations
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 R
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 will
cause frequency response peaking and possible circuit os-
cillations (see Application Note OA-15 for more information).
High quality chip capacitors with values in the range of
1000pF to 0.1μF should be used for power supply bypass-
ing. 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, a tantalum ca-
pacitor with a value between 4.7μF and 10μF should be
connected in parallel with the chip capacitor. Signal lines
connecting the feedback and gain resistors should be as
short as possible to minimize inductance and microstrip line
effect. Input and output termination resistors should be
placed as close as possible to the input/output pins. Traces
greater than 1 inch in length should be impedance matched
to the corresponding load termination.
Symmetry between the positive and negative paths in the
layout of differential circuitry should be maintained so as to
minimize the imbalance of amplitude and phase of the dif-
ferential signal.
Device
LMH6622MA
LMH6622MM
Package
SOIC-8
MSOP-8
Evaluation Board P/N
CLC730036
CLC730123
These free evaluation boards are shipped when a device
sample request is placed with National Semiconductor.
Component value selection is another important parameter
in working with high speed/high performance amplifiers.
Choosing external resistors that are large in value compared
to the value of other critical components will affect the closed
loop behavior of the stage because of the interaction of
these resistors with parasitic capacitances. These parasitic
capacitors could either be inherent to the device or be a
by-product of the board layout and component placement.
Moreover, a large resistor will also add more thermal noise to
the signal path. Either way, keeping the resistor values low
will diminish this interaction. On the other hand, choosing
very low value resistors could load down nodes and will
contribute to higher overall power dissipation and worse
distortion.
Driving Capacitive Load
Capacitive Loads decrease the phase margin of all op amps.
The output impedance of a feedback amplifier becomes
inductive at high frequencies, creating a resonant circuit
when the load is capacitive. This can lead to overshoot,
ringing and oscillation. To eliminate oscillation or reduce
ringing, an isolation resistor can be placed between the load
and the output. In general, the bigger the isolation resistor,
the more damped the pulse response becomes. For initial
evaluation, a 50
isolation resistor is recommended.
L
www.national.com
16
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6622MMX/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 |
| LMH6624 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single/Dual Ultra Low Noise Wideband Operational Amplifier |
| LMH6624_05 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single/Dual Ultra Low Noise Wideband Operational Amplifier |
| LMH6624A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:ULTRA LOW NOISE WIDEBAND OP AMP |
| LMH6624J-QML | 制造商:Texas Instruments 功能描述:OP Amp Single Volt Fdbk ±6V/12V 8-Pin CDIP Rail |
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