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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)： | 10/12頁 |
| 文件大?。?/td> | 280K |
| 代理商： | CLC418 |
http://www.national.com
10
Component
Value
Pre-distorted
Ideal
R
1A
C
2A
R
fA
R
1B
C
2B
R
3B
R
fB
R
1C
R
3C
C
4C
C
5C
R
fC
R
1D
/
α
D
R
1D
/(1-
α
D
)
R
3D
C
4D
C
5D
R
fD
R
gD
238
67pF
3.01k
314
67pF
953
953
108
1.06k
22pF
100pF
3.01k
256
256
900
22pF
100pF
953
953
211
300
100
1.07k
227
227
850
Table 1: Filter Component Values
The nearest standard values for capacitors and resistors
were used to build this filter. The resistors were 1%
tolerance, and the capacitors 5% tolerance. The ideal
and measured gains are shown in Figure 8.
Figure 8: Lowpass Anti-aliasing Filter Response
To change the cutoff frequency of this filter, do the following:
I
Determine the new cutoff frequency:
f
10
, where f
3dB(418)
is the
bandwidth of the CLC418
I
Scale (multiply) all frequency specifications and
plot axes by f
c(new)
/f
c
I
Make sure that your system requirements are met
I
Scale (multiply) all capacitor values by f
c
/f
c(new)
I
Set the resistors to the Ideal Values in the table
above (the pre-distorted values
do not
linearly
scale with frequency)
For more information on the design of Sallen-Key filters and
filter pre-distortion, see Comlinear’s App Notes on filters.
Figure 9 shows a precision full-wave rectifier using the
CLC418. When V
in
> 0, D
1
is on, D
2
is off, V
2
= 0 and an
overall non-inverting gain is achieved. When V
in
< 0, D
1
is off, D
2
is on, both V
1
and V
2
are positive, and an over-
all inverting gain is achieved. The output voltage of the
rectifier is:
Figure 9: Precision Full-Wave Rectifier
Diodes D
1
and D
2
need to be Schottky or PIN diodes to
minimize delay.
Select the voltage gain for U1a (G
1
< 0) and U1b (G
2
).
G
2
needs to be
≤
1, approximately, to ensure realizable
values of R
4
. The overall gain is:
Set R
2
= R
3
to the recommended feedback resistor
value for the gain A
v
= R
2
. You may need to increase R
2
and R
3
slightly to compensate for the delays through D
1
and D
2
.
Set R
7
to the recommended feedback resistor value for
the gain A
v
= (1 + G
2
).
Calculate the ratio:
If this ratio is negative, reduce G
2
and recalculate the
values up to this point.
G
Frequency (MHz)
0
-30
-20
-10
-60
1
10
-40
-50
Measured
Ideal
V
R
R
R
R
1
R
R
R
1
R
R
R
R
R
R
V ,V
0
V ,V
0
o
2
5
7
1
2
5
3
4
6
2
1
7
5
in
in
=
+
+
+
+
+
>
<
R
3
-
+
20
C1/2
418 Fig9
R
1
V
in
R
4
R
6
-
+
C1/2
R
2
R
5
R
7
U1a
U1b
V
o
C
1
V
2
V
1
D
2
D
1
V
V
G G
V
0
o
in
2
in
=
>
,
R
R
1+R
R
1
1
G
R
R
1
R
R
G
R
R
R
R
G
4
6
7
2
2
2
3
2
7
3
7
3
2
3
2
=
+
+
+
f
c(new)
3dB(418)
≤
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PDF描述 |
|---|---|
| CLC418AJ | Dual High-Speed, Low-Power Line Driver |
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| CLC420AJE | High-Speed, Voltage Feedback Op Amp |
| CLC420 | High-Speed, Voltage Feedback Op Amp |
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| 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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