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MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
minimum current that resolved ACS75x current sensors limited noise present output sensors. noise specifications vary among families ACS75x current sensors, shown table general, resolution improved addition external filters sensor output. However, beyond certain levels, such filtering limits bandwidth response time sensor. This application note guide evaluating trade-off resolution versus response time when using ACS75x current sensors. This information help tailor design your application manage output noise. ON-BOARD FILTER LIMITATIONS ACS75x families have on-board filters their outputs. However, relatively loose tolerances which resistors capacitors fabricated semiconductor die, tolerance these on-board filters typically large percent. accommodate those tolerances, center value filters ACS75x value less than higher than packagelimited bandwidth sensor. result, on-board filter never becomes limiting factor response time sensor. fact, case
Table Family Comparison ACS750 Family Noise1 (mV) Resolution2
1Typical;
ACS752 family, on-board filter value significantly higher than this criterion. Table shows on-board filter values, tolerance limits, package-limited bandwidth ACS75x families.
Table On-Board Filter Tolerance Range Device Family ACS750 ACS752 ACS754 On-Board Filter Value (kHz) Min. Nominal Max. PackageLimited Bandwidth (kHz)
tolerance package-limited bandwidth, other hand, very small. This because depends solely mechanical tolerances. IMPROVING RESOLUTION NOISE PERFORMANCE filtering tolerances achievable using discrete external filters much tighter than tolerances available with on-board filters. types filtering optimally configured work together using external filter with tight tolerance value close same package-limited bandwidth. With types filtering working tandem, external filter remove noise that
ACS754 Family 100A 130A 150A 200A
ACS752 Family 100A
100A
average peak-to-peak full scale
Applications Note ACS75X-AN1, Rev.
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
passes through on-board filters. particular, this reduces eliminates noise those frequencies falling middle upper-end distribution range on-board filters. Such filter combination, implemented passive network, results only minimal reduction sensor response time bandwidth. When more sophisticated active filters used (such Butterworth Chebychev), there almost impact sensor response time. This improvement most dramatically apparent ACS752 family. Table shows substantial reduction noise, minimal reduction bandwidth, that results from placing filter ACS752 output. Table compares effect external filter rated package bandwidth kHz), rated just above package bandwidth, kHz. filter rated equivalent device bandwidth minimal effect bandwidth, comparison unfiltered case. Noise further reduced resolution increased external filter rated less than package-limited bandwidth. However, that case filter becomes limiting factor response time bandwidth sensor circuit.
ACS752-50 Unfiltered Noise, average peak-to-peak2 (mV) Resolution full scale) Step Response Interval Range2 (µs) Bandwidth2 (kHz)
2Typical
Table Effect External Filter ACS752 Family Output ACS752-100 Unfiltered Filtered1 10.5 10.5 Filtered1
external filter: 0.01
Table Effect External Filters ACS754 Family Output ACS754 Device Type external filtering Noise, peak-to-peak* (mV) Resolution full scale) Step Response Interval* (µs) Bandwidth* (kHz) Noise, peak-to-peak* (mV) Resolution full scale) Step Response Interval* (µs) Bandwidth* (kHz) 12.5 15.5 100A 10.5 14.0 13.0 130A 10.5 14.0 13.0 150A 10.5 14.0 12.5 200A 10.0 14.0 12.5
External filter, 0.01
External filter, 0.01 Noise, peak-to-peak* (mV) Resolution full scale) Step Response Interval* (µs) 14.0 Bandwidth* (kHz) *Typical
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS752-050. Output noise, filtering, ac-coupled.
Figure ACS752-050 Output noise, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS752-100. Output noise, filtering, ac-coupled.
Figure ACS752-100 Output noise, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-050. Output noise, filtering, ac-coupled.
Figure ACS754-050 Output noise, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-100. Output noise, filtering, ac-coupled.
Figure ACS754-100 Output noise, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-130. Output noise, filtering, ac-coupled.
Figure ACS754-130 Output noise, with filter 0.01 µF), ac-coupled.
Figure ACS754-130 Output noise, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-150. Output noise, filtering, ac-coupled.
Figure ACS754-150 Output noise, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-200. Output noise, filtering, ac-coupled.
Figure ACS754-200 Output noise, with filter 0.01 µF), ac-coupled.
Figure ACS754-200 Output noise, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS752-050. Step response, filtering, ac-coupled.
Figure ACS752-050 Step response, with low-pass filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS752-100. Step response, filtering, ac-coupled.
Figure ACS752-100 Step response, with low-pass filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-050. Response step, filtering, ac-coupled.
Figure ACS754-050 Response step, with filter 0.01 µF), ac-coupled.
Figure ACS754-050 Response step, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-100. Response step, filtering, ac-coupled.
Figure ACS754-100 Response step, with filter 0.01 µF), ac-coupled.
Figure ACS754-100 Response step, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-130. Response step, filtering, ac-coupled.
Figure ACS754-130 Response step, with filter 0.01 µF), ac-coupled.
Figure ACS754-130 Response step, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-150. Response step, filtering, ac-coupled.
Figure ACS754-150 Response step, with filter 0.01 µF), ac-coupled.
Figure ACS754-150 Response step, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
Figure ACS754-200. Response step, filtering, ac-coupled.
Figure ACS754-200 Response step, with filter 0.01 µF), ac-coupled.
Figure ACS754-200 Response step, with filter 0.01 µF), ac-coupled.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
MANAGING NOISE LEVELS ACS75X CURRENT SENSORS
products described herein manufactured under more following U.S. patents: 5,045,920; 5,264,783; 5,442,283; 5,389,889; 5,581,179; 5,517,112; 5,619,137; 5,621,319; 5,650,719; 5,686,894; 5,694,038; 5,729,130; 5,917,320; other patents pending. Allegro MicroSystems, Inc. reserves right make, from time time, such departures from detail specifications required permit improvements performance, reliability, manufacturability products. Before placing order, user cautioned verify that information being relied upon current. Allegro products authorized critical components life-support devices systems without express written approval. information included herein believed accurate reliable. However, Allegro MicroSystems, Inc. assumes responsibility use; infringement patents other rights third parties which result from use. Copyright 2004 Allegro MicroSystems, Inc.
Applications Note ACS75X-AN1, Rev.
Allegro MicroSystems, Inc. Northeast Cutoff, 15036 Worcester, Massachusetts 01615-0036 (508) 853-5000 www.allegromicro.com
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