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LMC6024 Datasheet(PDF) 10 Page - National Semiconductor (TI) |
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LMC6024 Datasheet(HTML) 10 Page - National Semiconductor (TI) |
10 / 14 page Application Hints (Continued) BIAS CURRENT TESTING The test method of Figure 7 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 bea5pFor10pF 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. Typical Single-Supply Applications (V+ = 5.0 V DC) DS011235-13 (Input pins are lifted out of PC board and soldered directly to components. All other pins connected to PC board.) FIGURE 6. Air Wiring DS011235-14 FIGURE 7. Simple Input Bias Current Test Circuit Photodiode Current-to-Voltage Converter DS011235-15 Note 14: A 5V bias on the photodiode can cut its capacitance by a factor of 2 or 3, leading to improved response and lower noise. However, this bias on the photodiode will cause photodiode leakage (also known as its dark cur- rent). Micropower Current Source DS011235-16 (Upper limit of output range dictated by input common-mode range; lower limit dictated by minimum current requirement of LM385.) www.national.com 10 |
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