+

±

VIN

VOUT

R1

R2

LMC6001

LMC6001

SNOS694I – MARCH 1995 – REVISED SEPTEMBER 2015

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Application Information (continued)

Figure 20. LMC6001 Noninverting Gain of 10 Amplifier, Compensated to Handle Capacitive Loads

In the circuit of Figure 20, R1 and C1 serve to counteract the loss of phase margin by feeding the high frequency

component of the output signal back to the inverting input of the amplifier, thereby preserving phase margin in

the overall feedback loop.

Capacitive load driving capability is enhanced by using a pullup resistor to V+ (Figure 21). Typically a pullup

resistor conducting 500

μA or more will significantly improve capacitive load responses. The value of the pullup

resistor must be determined based on the current sinking capability of the amplifier with respect to the desired

output swing. Open-loop gain of the amplifier can also be affected by the pullup resistor. See DC Electrical

Characteristics for LMC6001AI.

Figure 21. Compensating for Large Capacitive Loads With a Pullup Resistor

8.2 Typical Application

The extremely high input resistance, and low power consumption, of the LMC6001 make it ideal for applications

that require battery-powered instrumentation amplifiers. Examples of these types of applications are hand-held

pH probes, analytic medical instruments, electrostatic field detectors and gas chromotographs.

Figure 22. Typical Application Schematic, LMC6001

16

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