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參數(shù)資料
| 型號： | CLC418 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | Dual High-Speed, Low-Power Line Driver |
| 中文描述： | 雙高速，低功耗，線路驅(qū)動器 |
| 文件頁數(shù)： | 5/12頁 |
| 文件大?。?/td> | 280K |
| 代理商： | CLC418 |
5
http://www.national.com
CLC418 OPERATION
The CLC418 has a current-feedback (CFB) architecture
built in an advanced complementary bipolar process.
The key features of current-feedback are:
I
AC bandwidth is independent of voltage gain
I
Inherently unity-gain stability
I
Frequency response may be adjusted with
feedback resistor (R
f
in Figures 1-3)
I
High slew rate
I
Low variation in performance for a wide range
of gains, signal levels and loads
I
Fast settling
Current-feedback operation can be explained with a
simple model. The voltage gain for the circuits in Figures 1
and 2 is approximately:
where:
I
A
v
is the DC voltage gain
I
R
f
is the feedback resistor
I
Z(j
ω
) is the CLC418’s open-loop
transimpedance gain
Z j
R
f
I
is the loop gain
The denominator of the equation above is approximately
1 at low frequencies. Near the -3dB corner
frequency, the interaction between R
f
dominates the circuit performance. Increasing R
f
does
the following:
and Z(j
ω
)
I
Decreases loop gain
I
Decreases bandwidth
I
Reduces gain peaking
I
Lowers pulse response overshoot
I
Affects frequency response phase linearity
CLC418 DESIGN INFORMATION
Standard op amp circuits work with CFB op amps. There
are 3 unique design considerations for CFB:
I
The feedback resistor (R
f
in Figures 1-3) sets
AC performance
I
R
f
cannot be replaced with a short or a capacitor
I
The output offset voltage is not reduced by
balancing input resistances
The following sub-sections cover:
I
Design parameters, formulas and techniques
I
Interfaces
I
Application circuits
I
Layout techniques
I
SPICE model information
DC Gain (non-inverting)
The non-inverting DC voltage gain for the configuration
shown in Figure 1 is:
Figure 1: Non-Inverting Gain
The normalized gain plots in the
Typical Performance
Characteristics
section show different feedback
resistors (R
f
) for different gains. These values of R
f
are
recommended for obtaining the highest bandwidth with
minimal peaking. The resistor R
t
provides DC bias for
the non-inverting input.
For A
v
< 6, use linear interpolation on the nearest A
v
values to calculate the recommended value of R
f
. For A
v
≥
6, the minimum recommended R
f
is 200
.
Select R
g
to set the DC gain:
DC gain accuracy is usually limited by the tolerance of R
f
and R
g
.
DC Gain (unity gain buffer)
The recommended R
f
for unity gain buffers is 3k
. R
g
is
left open. Parasitic capacitance at the inverting node
may require a slight increase of R
f
to maintain a flat
frequency response.
DC Gain (inverting)
The inverting DC voltage gain for the configuration
shown in Figure 2 is:
The normalized gain plots in the
Typical Performance
Characteristics
section show different feedback
resistors (R
f
) for different gains. These values of R
f
are
recommended for obtaining the highest bandwidth with
minimal peaking. The resistor R
t
provides DC bias for
the non-inverting input.
For |A
v
| < 6, use linear interpolation on the nearest A
v
values to calculate the recommended value of R
f
. For
|A
v
|
≥
6, the minimum recommended R
f
is 200
.
+
-
C1/2
418 Fig1
R
f
0.1
μ
F
6.8
μ
F
+
V
o
V
in
V
CC
0.1
μ
F
6.8
μ
F
V
EE
3(5)
2(6)
4
8
1(7)
+
R
g
R
t
V
V
A
1
R
( )
ω
Z j
o
in
v
f
=
+
ω
( )
A
1
R
R
v
f
g
= +
R
R
A
1
g
f
v
=
A
R
R
v
f
g
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| CLC418AJ | Dual High-Speed, Low-Power Line Driver |
| CLC420AJP | High-Speed, Voltage Feedback Op Amp |
| CLC420AJE | High-Speed, Voltage Feedback Op Amp |
| CLC420 | High-Speed, Voltage Feedback Op Amp |
| CLC420AJE-TR13 | High-Speed, Voltage Feedback Op Amp |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| CLC418AJ | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Dual High-Speed, Low-Power Line Driver |
| CLC420 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High-Speed, Voltage Feedback Op Amp |
| CLC420AE-QML | 制造商:Rochester Electronics LLC 功能描述:HI SPEED VOLTAGE FEEDBK OP AMP - Bulk 制造商:Texas Instruments 功能描述: |
| CLC420AIB | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
| CLC420AID | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Voltage-Feedback Operational Amplifier |
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