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參數(shù)資料
| 型號： | LMF60CIWM-100 |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬濾波器 |
| 英文描述： | LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter |
| 中文描述： | SWITCHED CAPACITOR FILTER, BUTTERWORTH, LOWPASS, PDSO14 |
| 封裝： | 0.300 INCH, PLASTIC, SOP-14 |
| 文件頁數(shù)： | 11/20頁 |
| 文件大小： | 391K |
| 代理商： | LMF60CIWM-100 |
1.0 LMF60 Application Hints
(Continued)
If the LMF60-50 or the LMF60-100 were set up for a cutoff
frequency of 10 kHz the input impedance would be:
R
IN
e
1
c
10
10
10 kHz
e
1 M
X
In this example with a source impedance of 10k the overall
gain, if the LMF60 had an ideal gain of 1 (0 dB) would be:
A
V
e
1 M
X
10 k
X
a
1 M
X
e
0.99009 (
b
86.4 mdB)
Since the maximum overall gain error for the LMF60 is
a
0.1
dB,
b
0.3 dB with a R
S
s
2 k
X
the actual gain error for this
case would be
a
0.21 dB to
b
0.39 dB.
1.5 CUTOFF FREQUENCY RANGE
The filter’s cutoff frequency (f
C
) has a lower limit caused by
leakage currents through the internal switches discharging
the stored charge on the capacitors. At lower clock frequen-
cies these leakage currents can cause millivolts of error, for
example:
f
CLK
e
100 Hz, I
LEAKAGE
e
1 pA, C
e
1 pF
1 pA
V
e
1 pF (100 Hz)
e
10 mV
The propagation delay in the logic and the settling time re-
quired to acquire a new voltage level on the capacitors in-
creases as the LMF60 power supply voltage decreases.
This causes a shift in the f
CLK
/f
C
ratio which will become
noticeable when the clock frequency exceeds 500 kHz. The
amplitude characteristic will stay within tolerance until f
CLK
exceeds 750 kHz and will peak at about 0.4 dB at the cutoff
frequency with a 2 MHz clock. The response of the LMF60
is still a reasonable approximation of the ideal Butterworth
lowpass characteristic as can be seen in Figure 7.
TL/H/9294–17
FIGURE 7a. LMF60-100
g
5V Supplies
Amplitude Response
TL/H/9294–18
FIGURE 7b. LMF60-50
g
5V Supplies
Amplitude Response
TL/H/9294–19
FIGURE 7c. LMF60-100
g
2.5V Supplies
Amplitude Response
TL/H/9294–20
FIGURE 7d. LMF60-50
g
2.5V Supplies
Amplitude Response
http://www.national.com
11
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMF60CIWM-50 | 制造商:Texas Instruments 功能描述: |
| LMF60CMJ-100 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter |
| LMF60CMJ-100/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Filter |
| LMF60CMJ-50 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:LMF60 High Performance 6th-Order Switched Capacitor Butterworth Lowpass Filter |
| LMF60CMJ-50/883 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Analog Filter |
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