參數(shù)資料
型號(hào)： LMV771MG
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類(lèi)： 運(yùn)算放大器
英文描述： Single/Dual/Quad, Low Offset, Low Noise, RRO Operational Amplifiers
中文描述： OP-AMP, 1000 uV OFFSET-MAX, 3.5 MHz BAND WIDTH, PDSO5
封裝： SC-70, 5 PIN
文件頁(yè)數(shù)： 17/21頁(yè)
文件大小： 844K
代理商： LMV771MG
Application Note
(Continued)
This relationship depends on the output of all the filters. The
input-output relationship for A
2
can be expressed as:
And finally this relationship for A
3
is as follows:
Re-arranging these equations, one can find the relationship
between V
O
and V
(transfer function of the lowpass filter),
V
and V
(transfer function of the highpass filter), and V
and V
(transfer function of the bandpass filter) These rela-
tionships are as follows:
Lowpass filter
Highpass filter
Bandpass Filter
The center frequency and quality factor for all of these filters
is the same. The values can be calculated in the following
manner:
A design example is shown here:
Designing a bandpass filter with center frequency of 10kHz
and Quality factor of 5.5
To do this, first consider the quality factor. It is best to pick
convenient values for the capacitors. C
= C
= 1000pF.
Also, choose R
= R
= 30k
. Now Values of R
and R
6
need to be calculated. With the chosen values for the ca-
pacitors and resistors, Q reduces to:
or
R
5
= 10R
6
R
6
= 1.5k
R
5
= 15k
Also, for f = 10kHz, value of center frequency is
ω
c
= 2
π
f =
62.8kHz.
Using the expressions above, the appropriate resistor values
will be R
2
= R
3
= 16k
.
The following graphs show the transfer function of each of
the filters. The DC gain of this circuit is:
20039690
The following graphics show the frequency response of each
of the stages when using LMV774 as the amplifier:
20039691
FIGURE 10. Lowpass Filter Frequency Response
L
www.national.com
17
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMV771MG 制造商:Texas Instruments 功能描述:OP AMP, LOW NOISE, SMD, SC70-5, 771 制造商:Texas Instruments 功能描述:OP AMP, LOW NOISE, SMD, SC70-5, 771; Op Amp Type:Low Noise; No. of Amplifiers:1; Slew Rate:1.4V/s; Supply Voltage Range:2.7V to 5.5V; Amplifier Case Style:SC-70; No. of Pins:5; Bandwidth:3.5MHz; Operating Temperature Min:-40C; ;RoHS Compliant: Yes
LMV771MG/NOPB 功能描述:運(yùn)算放大器 - 運(yùn)放 Low Noise,Prec Op Amp In RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMV771MGX 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMV771MGX/NOPB 功能描述:運(yùn)算放大器 - 運(yùn)放 RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補(bǔ)償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel
LMV772 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Single/Dual/Quad, Low Offset, Low Noise, RRO Operational Amplifiers
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