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參數資料
| 型號： | CLC412 |
| 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： | 5/12頁 |
| 文件大小： | 1398K |
| 代理商： | CLC412 |
CLC412
-
V
in
V
out
R
f
R
g
R
in
R
o
+
C
3
C
2
C
1
C
4
+
+
-V
cc
+V
cc
Application Introduction
Offered in an 8-pin package for reduced space and cost,
the wideband CLC412 dual current-feedback op amp
provides closely matched DC & 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
transimpedance amplifiers will all find superior
performance in the CLC412 dual op amp.
Feedback Resistor Selection
The loop gain and frequency response for a current-
feedback operational amplifier is determined largely by
the feedback resistor, R
f
. The Electrical Characteristics
and Typical Performance plots specify an R
f
of 634
, a
gain of +2V/V and operation with
±
5V power supplies
(unless otherwise stated). Generally, lowering R
f
from its
recommended value will peak the frequency response
and extend the bandwidth while increasing its value will
roll off the response. Reducing the value of R
f
too far
below its recommended value will cause overshoot,
ringing and eventually oscillation.
The plot above labeled "Frequency Response vs. R
f
"
shows the CLC412’s frequency and phase response as
R
f
is varied while the gain remains constant at +2V/V
(R
L
=100
). This plot shows that one particular value of
R
f
will optimize the frequency and phase response at the
specified gain setting, i.e. 634
at a gain of +2V/V.
Current-feedback op amps, unlike voltage-feedback op
amps, have a direct relationship between their frequency
and phase response to the value of the feedback resistor,
R
f
. For more information see Application Note OA-13
which describes the relationship between R
f
and closed-
loop frequency response.
When configuring the CLC412 for other inverting or non-
inverting gains, it is necessary to adjust the value of the
feedback resistor in order to optimize the device’s
frequency and phase response. The two plots below
provide the means of selecting the recommended
feedback-resistor value for both inverting and non-
inverting gain selections. Both plots show the value of R
f
approaching a non-zero minimum (dashed line) at high
gains, which is characteristic of current-feedback op
amps, while the linear portion of the two (solid) curves
(i.e. -5>A
v
>+6) results from the limitation placed on R
g
(i.e. R
g
≥
50
). This limitation is due to the desire to keep
R
g
greater in value than that of the inverting input
resistance. Therefore, the resulting small-signal
V
in
V
out
R
f
R
b
R
g
R
o
+
-
C
3
C
2
C
1
C
4
+
+
-V
cc
+V
cc
CLC412
Figure 1
Figure 2
5
http://www.national.com
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| CLC412AMC | Dual Wideband Video Op Amp |
| CLC412AIB | Dual Wideband Video Op Amp |
| CLC412A8L-2A | Dual Wideband Video Op Amp |
相關代理商/技術參數 |
參數描述 |
|---|---|
| CLC412 WAF | 制造商:Texas Instruments 功能描述: |
| CLC412A/B2A | 制造商:Rochester Electronics LLC 功能描述: |
| CLC412A8B | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Wideband Video Op Amp |
| CLC412A8D | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Current-Feedback Operational Amplifier |
| CLC412A8L-2A | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual Wideband Video Op Amp |
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