LPV521

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SNOSB14C – AUGUST 2009 – REVISED FEBRUARY 2013

Twisted pair cabling and the active front-end’s common-mode rejection provide immunity against low frequency

noise (i.e. 60 Hz or 50 Hz mains) but are ineffective against RF interference. Even a few centimeters of PCB

trace and wiring for sensors located close to the amplifier can pick up significant 1 GHz RF. The integrated EMI

filters of the LPV521 reduce or eliminate external shielding and filtering requirements, thereby increasing system

robustness. A larger EMIRR means more rejection of the RF interference. For more information on EMIRR,

please refer to AN-1698.

POWER SUPPLIES AND LAYOUT

The LPV521 operates from a single 1.6V to 5.5V power supply. It is recommended to bypass the power supplies

with a 0.1

Ground layout improves performance by decreasing the amount of stray capacitance and noise at the op amp's

inputs and outputs. To decrease stray capacitance, minimize PC board trace lengths and resistor leads, and

place external components close to the op amps' pins.

Copyright © 2009–2013, Texas Instruments Incorporated

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Product Folder Links: LPV521