Datasheet

0.1
100
100k
10
100
1000
10000
1k
10
1M
FREQUENCY (Hz)
10k
1
VOLTAGE NOISE (nV/
Hz)
V
S
= 5V
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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