±250-mV input, precision current sensing reinforced isolated modulator with integrated DC/DC

The AMC3306M25 is a precision,

isolated delta-sigma (ΔΣ) modulator, optimized for shunt-based current measurements.

The fully integrated, isolated DC/DC converter allows single-supply operation from

the low-side of the device, which makes the device a unique solution for

space-constrained applications. The reinforced capacitive isolation barrier is

certified according to VDE V 0884-11 and UL1577 and supports a working voltage of up

to 1.2 kVRMS.

The isolation barrier separates parts

of the system that operate on different common-mode voltage levels and protects the

low-voltage side from hazardous voltages and damage.

The input of the AMC3306M25 is

optimized for direct connection to a low-impedance shunt resistor or other,

low-impedance voltage sources with low signal levels. The excellent DC accuracy and

low temperature drift support accurate current measurements over the extended

industrial temperature range from –40°C to +125°C.

By using a digital filter (such as a

sinc3 filter) to decimate the bitstream, the device can achieve 16

bits of resolution with a dynamic range of 85 dB at a data rate of 78 kSPS.