According to its maker, the ACS726 is the first current sensor IC to include a fully differential back end amplifier for adjusting gain and bandwidth via external RC networks. The back end amplifier is fully independent and, when unused, powers down to reduce power consumption. The fully differential output of the device has a positive differential voltage (VOUTP – VOUTN) when an increasing current flows through the primary copper conduction path (from pins 1 through 6, to pins 7 through 12), which is the path used for current sensing. The internal resistance of this conductive path is 1.1 mΩ typical. Pricing is $1.73 each/1,000. See a datasheet at http://www.allegromicro.com/~/media/Files/Datasheets/ACS726-Datasheet.ashx
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