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參數(shù)資料
| 型號(hào)： | LMH6609MF |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | 900MHz Voltage Feedback Op Amp |
| 中文描述： | OP-AMP, 2500 uV OFFSET-MAX, PDSO5 |
| 封裝： | SOT-23, 5-PIN |
| 文件頁數(shù)： | 11/15頁 |
| 文件大?。?/td> | 641K |
| 代理商： | LMH6609MF |
Application Section
(Continued)
GAIN BANDWIDTH PRODUCT
The LMH6609 is a voltage feedback amplifier, whose
closed-loop bandwidth is approximately equal to the gain-
bandwidth product (GBP) divided by the gain (A
V
). For gains
greater than 5, A
V
sets the closed-loop bandwidth of the
LMH6609.
20079031
For Gains less than 5, refer to the frequency response plots
to determine maximum bandwidth. For large signal band-
width the slew rate is a more accurate predictor of band-
width.
20079032
Where f
= bandwidth, S
R
= Slew rate and V
P
= peak
amplitude.
OUTPUT DRIVE AND SETTLING TIME PERFORMANCE
The LMH6609 has large output current capability. The
100mA of output current makes the LMH6609 an excellent
choice for applications such as:
Video Line Drivers
Distribution Amplifiers
When driving a capacitive load or coaxial cable, include a
series resistance R
OUT
to back match or improve settling
time. Refer to the Driving Capacitive Loads section for guid-
ance on selecting an output resistor for driving capacitive
loads.
EVALUATION BOARDS
National Semiconductor provides the following evaluation
boards as a guide for high frequency layout and as an aid in
device testing and characterization. Many of the datasheet
plots were measured with these boards.
Device
Package
SOIC
SOT-23
Board Part
#
CLC730227
CLC730216
LMH6609MA
LMH6609MF
A free evaluation board is automatically shipped when a
sample request is placed with National Semiconductor.
CIRCUIT LAYOUT CONSIDERATION
A proper printed circuit layout is essential for achieving high
frequency performance. National provides evaluation boards
for the LMH6609 as shown above. These boards were laid
out for optimum, high-speed performance. The ground plane
was removed near the input and output pins to reduce
parasitic capacitance. Also, all trace lengths were minimized
to reduce series inductances.
Supply bypassing is required for the amplifiers performance.
The bypass capacitors provide a low impedance return cur-
rent path at the supply pins. They also provide high fre-
quency filtering on the power supply traces. 10μF tantalum
and .01μF capacitors are recommended on both supplies
(from supply to ground). In addition a .1μF ceramic capacitor
can be added from V
+
to V
to aid in second harmonic
suppression.
DRIVING CAPACITIVE LOADS
Capacitive output loading applications will benefit from the
use of a series output resistor R
OUT
.
Figure 5
shows the use
of a series output resistor, R
driving an analog to digital converter. The charts "Suggested
R
vs. Cap Load" in the Typical Performance Section give a
recommended value for mitigating capacitive loads. The val-
ues suggested in the charts are selected for .5dB or less of
peaking in the frequency response. This gives a good com-
promise between settling time and bandwidth. For applica-
tions where maximum frequency response is needed and
some peaking is tolerable, the value of R
O
can be reduced
slightly from the recommended values. There will be ampli-
tude lost in the series resistor unless the gain is adjusted to
compensate; this effect is most noticeable with heavy resis-
tive loads.
20079030
FIGURE 4. AC Coupled Non-Inverting
20079033
FIGURE 5. Driving Capacitive Loads with R
OUT
for
Improved Stability
L
www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6609MF/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6609MF/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LMH6609MFX | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6609MFX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6611 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:PowerWise㈢ Single Supply 345 MHz Rail-to-Rail Output Amplifiers |
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