LPV521MGX Datasheet, PDF (23/29 Pages) Texas Instruments – LPV521 Nanopower, 1.8V, RRIO, CMOS Input, Operational Amplifier

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 μF ceramic capacitor placed close to the V⁺ and V^− pins.
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.
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