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LMV651, LMV652, LMV654

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SNOSAI7K – SEPTEMBER 2005 – REVISED MAY 2016

Product Folder Links: LMV651 LMV652 LMV654

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Copyright © 2005–2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

TI’s LMV65x devices have 12 MHz of bandwidth, are unity-gain stable, and consume only 116

μA of current.

They also have a maximum input offset voltage of 1.5 mV, a rail-to-rail output stage, and an input common-mode

voltage range that includes ground. Lastly, these operational amplifiers provide a PSRR of 95 dB, a CMRR of

100 dB, and a total harmonic distortion (THD) of 0.003% at 1-kHz frequency and 2-k

Ω load.

7.2 Functional Block Diagram

(Each Amplifier)

7.3 Feature Description

7.3.1 Low Voltage and Low Power Operation

The LMV65x have performance specified at supply voltages of 3 V and 5 V. These parts are specified to be

operational at all supply voltages between 2.7 V and 5.5 V. The LMV651 draws a low supply current of 116

μA,

the LMV652 draws 118

μA/channel and the LMV654 draws 122 μA/channel. This family of operational amplifiers

provides the low voltage and low power amplification that is essential for portable applications.

7.3.2 Wide Bandwidth

Despite drawing the very low supply current of 116 µA, the LMV65x manage to provide a wide unity-gain

bandwidth of 12 MHz. This is easily one of the best bandwidth to power ratios ever achieved, and allows these

operational amplifiers to provide wideband amplification while using the minimum amount of power. This makes

this family of parts ideal for low-power signal processing applications such as portable media players and other

accessories.

7.3.3 Low Input Referred Noise

The LMV65x provides a flatband input referred voltage noise density of 17 nV/

√Hz, which is significantly better

than the noise performance expected from a low-power operational amplifiers. These operational amplifiers also

feature exceptionally low 1/f noise, with a very low 1/f noise corner frequency of 4 Hz. This makes these parts

ideal for low power applications which require decent noise performance, such as PDAs and portable sensors.

7.3.4 Ground Sensing and Rail-to-Rail Output

The LMV65x each have a rail-to-rail output stage, which provides the maximum possible output dynamic range.

This is especially important for applications requiring a large output swing. The input common-mode range of this

family of devices includes the negative supply rail which allows direct sensing at ground in a single-supply

operation.

7.3.5 Small Size

The small footprint of the packages for the LMV65x saves space on printed-circuit boards, and enables the

design of smaller and more compact electronic products. Long traces between the signal source and the

operational amplifier make the signal path susceptible to noise. By using a physically smaller package, these

operational amplifiers can be placed closer to the signal source, reducing noise pickup and enhancing signal

integrity.