ACS730 datasheet(14/18 Pages) ALLEGRO

14 / 18 page

1 MHz Bandwidth, Galvanically Isolated Current Sensor IC

in Small Footprint SOIC8 Package

ACS730

Allegro MicroSystems, LLC

115 Northeast Cutoff

Worcester, Massachusetts 01615-0036 U.S.A.

1.508.853.5000; www.allegromicro.com

Power Supply Rejection Ratio (PSRR). The ratio of the change

on VIOUT or VZCR to a change in VCC in dB.

PSRR = 20 log10

VCC

VIOUT

Sensitivity Power Supply Rejection Ratio (PSRR). The ratio of

the percent change in sensitivity from the sensitivity at 5 V to the

percent change in VCC in dB.

SPSRR (VCC) = 20 log10

Sens5V × (VCC – 5 V)

[SensVCC × Sens5V] × 5 V

A SPSRR value of 15 dB means that a ten percent change in VCC

(going from 5 to 5.5 V, for example) results in around a 1.75 per-

cent change in sensitivity.

Offset Power Supply Rejection Ratio (OPSRR). The ratio of

the change in offset to a change in VCC in dB.

OPSRR = 20 log10

VCC

VOE

An OPSRR value of 30 dB means that a 500 mV change in VCC

(going from 5 to 5.5 V, for example) results in around 15 mV of

change in the offset.

ACS730 Datasheet(PDF) 14 Page - Allegro MicroSystems