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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： | 24/28頁 |
| 文件大小： | 868K |
| 代理商： | LMF100CIWM |
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3.0 Applications Information
(Continued)
Mode 1b
Mode 2 and Mode 5
Mode 3
Mode 6a and 6c
Mode 6b
In many applications, the outputs are ac coupled and dc off-
sets are not bothersome unless large signals are applied to
the filter input. However, larger offset voltages will cause
clipping to occur at lower ac signal levels, and clipping at any
of the outputs will cause gain nonlinearities and will change
f
and Q. When operating in Mode 3, offsets can become ex-
cessively large if R
and R
are used to make f
/f
signifi-
cantly higher than the nominal value, especially if Q is also
high.
For example, Figure 23 shows a second-order 60 Hz notch
filter. This circuit yields a notch with about 40 dB of attenua-
tion at 60 Hz. A notch is formed by subtracting the bandpass
output of a mode 3 configuration from the input using the un-
used side B opamp. The Q is 10 and the gain is 1 V/V in the
passband. However, f
/f
= 1000 to allow for a wide input
spectrum. This means that for pin 12 tied to ground (100:1
mode), R4/R2 = 100. The offset voltage at the lowpass out-
put (LP) will be about 3V. However, this is an extreme case
and the resistor ratio is usually much smaller. Where neces-
sary, the offset voltage can be adjusted by using the circuit of
Figure 24 This allows adjustment of V
, which will have
varying effects on the different outputs as described in the
above equations. Some outputs cannot be adjusted this way
in some modes, however (V
OS(BP)
in modes 1a and 3, for
example).
DS005645-12
FIGURE 22. Offset Voltage Sources
www.national.com
24
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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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