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參數資料
| 型號： | LMH6715 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dual Wideband Video Op Amp |
| 中文描述： | 雙寬帶視頻運算放大器 |
| 文件頁數： | 8/12頁 |
| 文件大小： | 484K |
| 代理商： | LMH6715 |
Application Section
Application Introduction
Offered in an 8-pin package for reduced space and cost, the
wideband LMH6715 dual current-feedback op amp provides
closely matched DC and AC electrical performance charac-
teristics making the part an ideal choice for wideband signal
processing. Applications such as broadcast quality video
systems, IQ amplifiers, filter blocks, high speed peak detec-
tors, integrators and transimedance amplifiers will all find
superior performance in the LMH6715 dual op amp.
FEEDBACK RESISTOR SELECTION
One of the key benefits of a current feedback operational
amplifier is the ability to maintain optimum frequency re-
sponse independent of gain by using appropriate values for
the feedback resistor (R
). The Electrical Characteristics and
Typical Performance plots specify an R
of 500
, a gain of
+2V/V and
±
5V power supplies (unless otherwise specified).
Generally, lowering R
F
from it’s recommended value will
peak the frequency response and extend the bandwidth
while increasing the value of R
F
will cause the frequency
response to roll off faster. Reducing the value of R
F
too far
below it’s recommended value will cause overshoot, ringing
and, eventually, oscillation.
Frequency Response vs. R
F
20042914
The plot labeled “Frequency Response vs. R
” shows the
LMH6715’s frequency response as R
F
is varied (R
= 100
,
A
= +2). This plot shows that an R
F
of 200
results in
peaking and marginal stability. An R
of 300
gives near
maximal bandwidth and gain flatness with good stability, but
with very light loads (R
L
>
300
) the device may show some
peaking. An R
of 500
gives excellent stability with good
bandwidth and is the recommended value for most applica-
tions. Since all applications are slightly different it is worth
some experimentation to find the optimal R
for a given
circuit. For more information see Application Note OA-13
which describes the relationship between R
and closed-
loop frequency response for current feedback operational
amplifiers.
When configuring the LMH6715 for gains other than +2V/V,
it is usually necessary to adjust the value of the feedback
resistor. The two plots labeled “R
vs. Non-inverting Gain”
and “R
vs. Inverting Gain” provide recommended feedback
resistor values for a number of gain selections.
20042935
FIGURE 1. Non-Inverting Configuration with Power
Supply Bypassing
20042937
FIGURE 2. Inverting Configuration with Power Supply
Bypassing
L
www.national.com
8
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| LMH6715MA | Dual Wideband Video Op Amp |
| LMH6715MAX | Dual Wideband Video Op Amp |
| LMH6738MQX | Very Wideband, Low Distortion Triple Op Amp |
| LMH6738 | Very Wideband, Low Distortion Triple Op Amp |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6715JFQML | 制造商:Texas Instruments 功能描述: |
| LMH6715JFQMLV | 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 |
| LMH6715J-QML | 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 |
| LMH6715MA | 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 |
| LMH6715MA/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 |
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