LMC6484IMSLASHNOPB datasheet(28/45 Pages) TI1

28 / 45 page

2 R C

2 R

R C

LMC6484

SNOS675C – AUGUST 2000 – REVISED SEPTEMBER 2015

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Typical Application (continued)

Figure 53. Canceling the Effect of Input Capacitance

The effect of input capacitance can be compensated for by adding a feedback capacitor. The feedback capacitor

(as in Figure 53), Cf, is first estimated by Equation 1:

(1)

which typically provides significant overcompensation. Printed circuit board stray capacitance may be larger or

smaller than that of a breadboard, so the actual optimum value for Cf may be different. The values of Cf should

be checked on the actual circuit. (Refer to the LMC660 Quad CMOS Amplifier data sheet (SNOSBZ3) for a more

detailed discussion.)

8.2.2.3 Offset Voltage Adjustment

Offset voltage adjustment circuits are illustrated in Figure 54 and Figure 55. Large value resistances and

potentiometers are used to reduce power consumption while providing typically ±2.5 mV of adjustment range,

referred to the input, for both configurations with VS = ±5 V.

Figure 54. Inverting Configuration

Figure 55. Noninverting Configuration

Offset Voltage Adjustment

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LMC6484IM/NOPB Datasheet(PDF) 28 Page - Texas Instruments