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參數(shù)資料
| 型號： | LMC6034IN |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)算放大器 |
| 英文描述： | CMOS Quad Operational Amplifier |
| 中文描述： | QUAD OP-AMP, 9000 uV OFFSET-MAX, 1.4 MHz BAND WIDTH, PDIP14 |
| 封裝： | DIP-14 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 301K |
| 代理商： | LMC6034IN |
Applications Hint
(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
10
BIAS CURRENT TESTING
The test method of Figure 11is 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.
DS011134-7
FIGURE 6. Guard Ring Connections
Inverting Amplifier
DS011134-8
FIGURE 7. Guard Ring Connections
Non-Inverting Amplifier
DS011134-9
FIGURE 8. Guard Ring Connections
Follower
DS011134-10
FIGURE 9. Guard Ring Connections
Howland Current Pump
DS011134-11
(Input pins are lifted out of PC board and soldered directly to components.
FIGURE 10. Air Wiring
DS011134-12
FIGURE 11. Simple Input Bias Current Test Circuit
www.national.com
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