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參數(shù)資料
| 型號： | LMH6715MAXEP |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 1 CHANNEL, VIDEO AMPLIFIER, PDSO8 |
| 封裝： | PLASTIC, SOIC-8 |
| 文件頁數(shù)： | 13/13頁 |
| 文件大?。?/td> | 489K |
| 代理商： | LMH6715MAXEP |
Application Section
Application Introduction
Offered in an 8-pin package for reduced space and cost, the
wideband LMH6715EP dual current-feedback op amp pro-
vides closely matched DC and AC electrical performance
characteristics making the part an ideal choice for wideband
signal processing. Applications such as broadcast quality
video systems, IQ amplifiers, filter blocks, high speed peak
detectors, integrators and transimedance amplifiers will all
find superior performance in the LMH6715EP 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
F). The Electrical Characteristics and
Typical Performance plots specify an R
F 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
20088514
The plot labeled “Frequency Response vs. R
F” shows the
LMH6715EP’s frequency response as R
F is varied (RL =
100
,A
V = +2). This plot shows that an RF of 200
results
in peaking and marginal stability. An R
F 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
F 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
F for a given
circuit. For more information see Application Note OA-13
which describes the relationship between R
F and closed-
loop frequency response for current feedback operational
amplifiers.
When configuring the LMH6715EP for gains other than
+2V/V, it is usually necessary to adjust the value of the
feedback resistor. The two plots labeled “R
F
vs. Non-
inverting Gain” and “R
F vs. Inverting Gain” provide recom-
mended feedback resistor values for a number of gain se-
lections.
20088535
FIGURE 1. Non-Inverting Configuration with Power
Supply Bypassing
20088537
FIGURE 2. Inverting Configuration with Power Supply
Bypassing
LMH6715EP
Enhanced
Plastic
www.national.com
9
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