LMC662CMX National Semiconductor, LMC662CMX Datasheet - Page 10

• Manufacturer Part Number: LMC662CMX
• Description: IC,Operational Amplifier,DUAL,CMOS,SOP,8PIN,PLASTIC
• Manufacturer: National Semiconductor

Specifications of LMC662CMX

• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

www.national.com
Application Hints
BIAS CURRENT TESTING
The test method of Figure 11 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 11. Simple Input Bias Current Test Circuit
(Continued)
00976322
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