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參數資料
| 型號： | LMC6041IM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | CMOS Single Micropower Operational Amplifier |
| 中文描述： | OP-AMP, 6300 uV OFFSET-MAX, 0.075 MHz BAND WIDTH, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁數： | 9/12頁 |
| 文件大小： | 381K |
| 代理商： | LMC6041IM |
Applications Hints
(Continued)
The designer should be aware that when it is inappropriate
to lay out a PC board for the sake of just a few circuits, there
is another technique which is even better than a guard ring
on a PC board: Don’t insert the amplifier’s input pin into the
board at all, but bend it up in the air and use only air as an in-
sulator. Air is an excellent insulator. In this case you may
have to forego some of the advantages of PC board con-
struction, but the advantages are sometimes well worth the
effort of using point-to-point up-in-the-air wiring. See Figure
6
Typical Single-Supply Applications
(V
= 5.0 V
DC
)
The extremely high input impedance, and low power con-
sumption, of the LMC6041 make it ideal for applications that
require battery-powered instrumentation amplifiers. Ex-
amples of these type of applications are hand-held pH
probes, analytic medical instruments, magnetic field detec-
tors, gas detectors, and silicon based pressure transducers.
The circuit in Figure 7 is recommended for applications
where the common-mode input range is relatively low and
the differential gain will be in the range of 10 to 1000. This
two op-amp instrumentation amplifier features an indepen-
dent adjustment of the gain and common-mode rejection
trim, and a total quiescent supply current of less than 28 μA.
To maintain ultra-high input impedance, it is advisable to use
ground rings and consider PC board layout an important part
of the overall system design (see Printed-Circuit-Board Lay-
out for High Impedance Work). Referring to Figure 7 the in-
put voltages are represented as a common-mode input V
CM
plus a differential input V
D
.
Rejection of the common-mode component of the input is
accomplished by making the ratio of R1/R2 equal to R3/R4.
So that where,
A suggested design guideline is to minimize the difference of
value between R1 through R4. This will often result in im-
proved resistor tempco, amplifier gain, and CMRR over tem-
perature. If RN = R1 = R2 = R3 = R4 then the gain equation
can be simplified:
Due to the “zero-in, zero-out” performance of the LMC6041,
and output swing rail-rail, the dynamic range is only limited to
the input common-mode range of 0V to V
–2.3V, worst case
at room temperature. This feature of the LMC6041 makes it
an ideal choice for low-power instrumentation systems.
A complete instrumentation amplifier designed for a gain of
100 is shown in Figure 8 Provisions have been made for low
sensitivity trimming of CMRR and gain.
DS011136-8
Inverting Amplifier
DS011136-9
Follower
DS011136-10
Non-Inverting Amplifier
FIGURE 5. Typical Connections of Guard Rings
DS011136-11
(Input pins are lifted out of PC board and soldered directly to components.
FIGURE 6. Air Wiring
DS011136-12
FIGURE 7. Two Op-Amp Instrumentation Amplifier
www.national.com
9
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMC6041IM | 制造商:Texas Instruments 功能描述:IC, OP AMP, CMOS, 8SOIC 制造商:Texas Instruments 功能描述:IC, OP AMP, CMOS, 8SOIC; Op Amp Type:CMOS; No. of Amplifiers:1; Slew Rate:0.02V/s; Supply Voltage Range:4.5V to 15.5V; Amplifier Case Style:SOIC; No. of Pins:8; Bandwidth:75kHz; Operating Temperature Min:-40C; Operating Temperature;RoHS Compliant: Yes |
| LMC6041IM/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6041IMX | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6041IMX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6041IN | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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