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參數資料
| 型號： | LMC660EM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | CMOS Quad Operational Amplifier |
| 中文描述： | QUAD OP-AMP, 6500 uV OFFSET-MAX, 1.4 MHz BAND WIDTH, PDSO14 |
| 封裝： | SO-14 |
| 文件頁數： | 9/14頁 |
| 文件大小： | 461K |
| 代理商： | LMC660EM |
Application 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
7
BIAS CURRENT TESTING
The test method of Figure 8 is appropriate for bench-testing
bias current with reasonable accuracy. To understand its op-
eration, first close switch S2 momentarily. When S2 is
opened, then
A suitable capacitor for C2 would be a 5 pF or 10 pF silver
mica, NPO ceramic, or air-dielectric. When determining the
magnitude of I
, the leakage of the capacitor and socket
must be taken into account. Switch S2 should be left shorted
most of the time, or else the dielectric absorption of the ca-
pacitor C2 could cause errors.
Similarly, if S1 is shorted momentarily (while leaving S2
shorted)
where C
x
is the stray capacitance at the + input.
DS008767-17
(a) Inverting Amplifier
DS008767-18
(b) Non-Inverting Amplifier
DS008767-19
(c) Follower
DS008767-20
(d) Howland Current Pump
FIGURE 6. Guard Ring Connections
DS008767-21
(Input pins are lifted out of PC board and soldered directly to components.
FIGURE 7. Air Wiring
DS008767-22
FIGURE 8. Simple Input Bias Current Test Circuit
www.national.com
9
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMC660EN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| LMC660EP | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:CMOS Quad Operational Amplifier |
| LMC662 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:CMOS Dual Operational Amplifier |
| LMC662AIM | 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 |
| LMC662AIM | 制造商:Texas Instruments 功能描述:IC OP AMP DUAL SMD SOIC8 662 |
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