lmc660aimx National Semiconductor Corporation, lmc660aimx Datasheet - Page 10
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lmc660aimx
Manufacturer Part Number
lmc660aimx
Description
Cmos Quad Operational Amplifier
Manufacturer
National Semiconductor Corporation
Datasheet
1.LMC660AIMX.pdf
(14 pages)
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Application Hints
(Input pins are lifted out of PC board and soldered directly to components.
All other pins connected to PC board.)
BIAS CURRENT TESTING
The test method of Figure 7 is appropriate for bench-testing
bias current with reasonable accuracy. To understand its
operation, first close switch S2 momentarily. When S2 is
opened, then
FIGURE 8. Simple Input Bias Current Test Circuit
FIGURE 7. Air Wiring
(Continued)
00876722
00876721
10
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
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.
b
−, the leakage of the capacitor and socket