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參數資料
| 型號： | LMF100CIWM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 模擬濾波器 |
| 英文描述： | High Performance Dual Switched Capacitor Filter |
| 中文描述： | DUAL SWITCHED CAPACITOR FILTER, RESISTOR PROGRAMMABLE, UNIVERSAL, PDSO20 |
| 封裝： | SOP-20 |
| 文件頁數： | 9/28頁 |
| 文件大小： | 868K |
| 代理商： | LMF100CIWM |
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1.0 Definitions of Terms
f
:
the frequency of the external clock signal applied to pin
10 or 11.
f
:
center frequency of the second order function complex
pole pair. f
is measured at the bandpass outputs of the
LMF100, and is the frequency of maximum bandpass gain.
(Figure 1).
f
:
the frequency of minimum (ideally zero) gain at the
notch outputs.
f
:
the center frequency of the second order complex zero
pair, if any. If f
is different from f
and if Q
is high, it can be
observed as the frequency of a notch at the allpass output.
(Figure 13).
Q:
“quality factor” of the 2nd order filter. Q is measured at the
bandpass outputs of the LMF100 and is equal to f
divided
by the 3 dB bandwidth of the 2nd order bandpass filter (Fig-
ure 1). The value of Q determines the shape of the 2nd order
filter responses as shown in Figure 6
Q
:
the quality factor of the second order complex zero pair,
if any. Q
Z
is related to the allpass characteristic, which is
written:
where Q
Z
= Q for an all-pass response.
H
OBP
:
the gain (in V/V) of the bandpass output at f = f
0
.
H
:
the gain (in V/V) of the lowpass output as f
→
0 Hz
(Figure 2).
H
:
the gain (in V/V) of the highpass output as f
→
f
CLK
/2
(Figure 3).
H
ON
:
the gain (in V/V) of the notch output as f
→
0 Hz and as
f
→
f
CLK
/2, when the notch filter has equal gain above and
below
the
center
frequency
low-frequency gain differs from the high-frequency gain, as
in modes 2 and 3a (Figure 10 and Figure 12), the two quan-
tities below are used in place of H
ON
.
H
ON1
:
the gain (in V/V) of the notch output as f
→
0 Hz.
H
ON2
:
the gain (in V/V) of the notch output as f
→
f
CLK
/2.
(Figure
4).
When
the
DS005645-19
(a)
DS005645-20
(b)
FIGURE 1. 2nd-Order Bandpass Response
www.national.com
9
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMF100CIWM/NOPB | 功能描述:有源濾波器 HI PERF DUAL SWITCH CAPACITOR FILTER RoHS:否 制造商:Maxim Integrated 通道數量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| LMF100CIWMX | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| LMF100CIWMX/NOPB | 功能描述:有源濾波器 RoHS:否 制造商:Maxim Integrated 通道數量:1 截止頻率:150 KHz 電源電壓-最大:11 V 電源電壓-最小:4.74 V 最大工作溫度:+ 85 C 安裝風格:Through Hole 封裝 / 箱體:PDIP N 封裝:Tube |
| LMF100J WAF | 制造商:Texas Instruments 功能描述: |
| LMF11C202W2851 | 制造商:Vishay Dale 功能描述:KIT LM F 11 C 202 W02851 E3 - Rail/Tube |
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