LMV321M7SLASHNOPB datasheet(20/52 Pages) TI1

20 / 52 page

LMV321-N, LMV321-N-Q1, LMV358-N

LMV358-N-Q1, LMV324-N, LMV324-N-Q1

SNOS012J – AUGUST 2000 – REVISED DECEMBER 2014

www.ti.com

9 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

9.1 Application Information

The LMV32x-N family of amplifiers is specified for operation from 2.7 V to 5 V (±1.35 V to ±2.5 V). Many of the

specifications apply from –40°C to 125°C. They provide ground-sensing inputs as well as rail-to-rail output swing.

Parameters that can exhibit significant variance with regard to operating voltage or temperature are presented in

the Typical Characteristics.

9.2 Typical Applications

9.2.1 Simple Low-Pass Active Filter

A simple active low-pass filter is shown in Figure 53.

Figure 53. Simple Low-Pass Active Filter

9.2.1.1 Design Requirements

The simple single pole active lowpass filter shown in Figure 53 will pass low frequencies and attenuate

frequencies above corner frequency (fc) at a roll-off rate of 20dB/Decade.

9.2.1.2 Detailed Design Procedure

The values of R1, R2, R3 and C1 are selected using the formulas in Figure 54. The low-frequency gain (

ω → 0)

is defined by

−R3/R1. This allows low-frequency gains other than unity to be obtained. The filter has a −20

dB/decade roll-off after its corner frequency fc. R2 should be chosen equal to the parallel combination of R1 and

R3 to minimize errors due to bias current. The frequency response of the filter is shown in Figure 55.

Figure 54. Simple Low-Pass Active Filter Equations

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Product Folder Links: LMV321-N LMV321-N-Q1 LMV358-N LMV358-N-Q1 LMV324-N LMV324-N-Q1

LMV321M7/NOPB Datasheet(PDF) 20 Page - Texas Instruments