LMV934-N-Q1 Datasheet, PDF (16/40 Pages) Texas Instruments – LMV93x-N/-N-Q1 Single, Dual, Quad 1.8-V, RRIO Operational Amplifiers

LMV931-N, LMV931-N-Q1
LMV932-N, LMV932-N-Q1, LMV934-N, LMV934-N-Q1
SNOS993O – NOVEMBER 2001 – REVISED DECEMBER 2014
7 Detailed Description
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7.1 Overview
The LMV93x-N are low-voltage, low-power operational amplifiers (op-amp) operating from 1.8-V to 5.5-V
supply voltages and have rail-to-rail input and output. LMV93x-N input common-mode voltage extends 200
mV beyond the supplies which enables user enhanced functionality beyond the supply voltage range.
7.2 Functional Block Diagram
(Each Amplifier)
7.3 Feature Description
The differential inputs of the amplifier consist of a noninverting input (+IN) and an inverting input (–IN). The
amplifer amplifies only the difference in voltage between the two inputs, which is called the differential input
voltage. The output voltage of the op-amp V_OUT is given by Equation 1:
V_OUT = A_OL (IN⁺ - IN^-)
where
• A_OL is the open-loop gain of the amplifier, typically around 100 dB (100,000x, or 10 uV per volt).
(1)
7.4 Device Functional Modes
7.4.1 Input and Output Stage
The rail-to-rail input stage of this family provides more flexibility for the designer. The LMV93x-N use a
complimentary PNP and NPN input stage in which the PNP stage senses common-mode voltage near V^− and
the NPN stage senses common-mode voltage near V⁺. The transition from the PNP stage to NPN stage occurs 1
V below V⁺. Because both input stages have their own offset voltage, the offset of the amplifier becomes a
function of the input common-mode voltage and has a crossover point at 1 V below V⁺.
Figure 28. Simplified Schematic Diagram
16
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