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LMC660EP Datasheet(PDF) 11 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Part # LMC660EP
Description  CMOS Quad Operational Amplifier
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Manufacturer  NSC [National Semiconductor (TI)]
Direct Link  http://www.national.com
Logo NSC - National Semiconductor (TI)

LMC660EP Datasheet(HTML) 11 Page - National Semiconductor (TI)

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Application Hints (Continued)
Bias Current Testing
The test method of Figure 8 is appropriate for bench-testing
bias current with reasonable accuracy. To understand its
operation, first close switch S2 momentarily. When S2 is
opened, then
A suitable capacitor for C2 would bea5pFor10pF silver
mica, NPO ceramic, or air-dielectric. When determining the
magnitude of I
b−, 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
capacitor C2 could cause errors.
Similarly, if S1 is shorted momentarily (while leaving S2
shorted)
where C
x is the stray capacitance at the + input.
20114521
(Input pins are lifted out of PC board and soldered directly to components.
All other pins connected to PC board.)
FIGURE 7. Air Wiring
20114522
FIGURE 8. Simple Input Bias Current Test Circuit
www.national.com
11


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