0.1

100

100k

10

100

1000

10000

1k

10

1M

FREQUENCY (Hz)

10k

1

LMV2011

www.ti.com

SNOSA32C – AUGUST 2003 – REVISED MARCH 2013

MORE BENEFITS

The LMV2011 offers the benefits mentioned above and more. It has a rail-to-rail output and consumes only

950µA of supply current while providing excellent DC and AC electrical performance. In DC performance, the

LMC2001 achieves 130dB of CMRR, 120dB of PSRR and 130dB of open loop gain. In AC performance, the

LMV2011 provides 3MHz of gain-bandwidth product and 4V/µs of slew rate.

HOW THE LMV2011 WORKS

The LMV2011 uses new, patented techniques to achieve the high DC accuracy traditionally associated with

chopper-stabilized amplifiers without the major drawbacks produced by chopping. The LMV2011 continuously

monitors the input offset and corrects this error. The conventional chopping process produces many mixing

products, both sums and differences, between the chopping frequency and the incoming signal frequency. This

mixing causes large amounts of distortion, particularly when the signal frequency approaches the chopping

frequency. Even without an incoming signal, the chopper harmonics mix with each other to produce even more

trash. If this sounds unlikely or difficult to understand, look at the plot (Figure 31), of the output of a typical

(MAX432) chopper-stabilized opamp. This is the output when there is no incoming signal, just the amplifier in a

gain of -10 with the input grounded. The chopper is operating at about 150Hz; the rest is mixing products. Add

an input signal and the noise gets much worse. Compare this plot with Figure 32 of the LMV2011. This data was

taken under the exact same conditions. The auto-zero action is visible at about 30kHz but note the absence of

mixing products at other frequencies. As a result, the LMV2011 has very low distortion of 0.02% and very low

mixing products.

Figure 31. The Output of a Chopper Stabilized Op Amp (MAX432)

Figure 32. The Output of the LMV2011

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