1 Features

• 3.3-V or 5-V single supply with integrated DC/DC

converter

• ±50-mV input voltage range optimized for current

measurement using shunt resistors

• Low DC errors:

– Offset error: ±50 μV (max)

– Offset drift: ±0.4 μV/°C (max)

– Gain error: ±0.2% (max)

– Gain drift: ±35 ppm/°C (max)

• High CMTI: 75 kV/μs (min)

• System-level diagnostic features

• Low EMI: meets CISPR-11 and CISPR-25

standards

• Safety-related certifications:

– 6000-VPEAK reinforced isolation per DIN VDE V

0884-11

– 4250-VRMS isolation for 1 minute per UL1577

• Fully specified over the extended industrial

temperature range: –40°C to +125°C

2 Applications

• Compact, isolated shunt-based current sensing in:

– Protection relays

– Motor drives

– Power supplies

– Photovoltaic inverters

3 Description

The AMC3306M05 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 AMC3306M05 is optimized for direct

connection to a low-impedance shunt resistor or other,

low-impedance voltage source with low signal levels.

The excellent DC accuracy and low temperature

drift supports accurate current measurments over the

extended industial 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.