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Copyright © 2016, Texas Instruments Incorporated

14

LMV641

SNOSAW3D – SEPTEMBER 2007 – REVISED AUGUST 2016

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Copyright © 2007–2016, Texas Instruments Incorporated

7 Detailed Description

7.1 Overview

The LMV641 is a wide-bandwidth, low-power operational amplifier with an extended power supply voltage range

of 2.7 V to 12 V. The device is unity-gain stable with a 10 MHz of gain bandwidth product. Operating on a typical

supply current of 138 µA, it provides a PSRR of 105 dB, CMRR of 120 dB, VOS of 500 µV, input referred voltage

noise of 14 nV/

√Hz, and a THD of 0.002%. This amplifier has a rail-to-rail output stage and a common mode

input voltage which includes the negative supply.

7.2 Functional Block Diagram

7.3 Feature Description

7.3.1 Low-Voltage and Low-Power Operation

The LMV641 has performance guaranteed at supply voltages of 2.7 V and 10 V. It is ensured to be operational

at all supply voltages between 2.7 V and 12 V. The LMV641 draws a low supply current of 138 µA. The LMV641

provides the low-voltage and low-power amplification, which is essential for portable applications.

7.3.2 Wide Bandwidth

Despite drawing the very low supply current of 138 µA, the LMV641 manages to provide a wide unity gain

bandwidth of 10 MHz. This is easily one of the best bandwidth to power ratios ever achieved, and allows this op

amp to provide wideband amplification while using the minimum amount of power. This makes the LMV641 ideal

for low power signal processing applications such as portable media players and other accessories.

7.3.3 Low Input Referred Noise

The LMV641 provides a flatband input referred voltage noise density of 14 nV/Hz, which is significantly better

than the noise performance expected from a low-power op amp. This op amp also feature exceptionally low 1/f

noise, with a very low 1/f noise corner frequency of 4 Hz. Because of this the LMV641 is 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 LMV641 has 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 part

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 LMV641 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 op amp

make the signal path susceptible to noise. By using a physically smaller package, these op amps can be placed

closer to the signal source, reducing noise pickup and enhancing signal integrity.