1 Features

? AEC-Q100 qualified for automotive applications:

– Temperature grade 1: –40°C to +125°C, TA

? Single-supply operation (3.3V or 5V) with

integrated DC/DC converter

? Input voltage range (±250mV) optimized for current

measurement using shunt resistors

? Low DC errors:

– Offset error: ±50μV (max)

– Offset drift: ±1μV/°C (max)

– Gain error: ±0.2% (max)

– Gain drift: ±35ppm/°C (max)

? High CMTI: 75kV/μs (min)

? System-level diagnostic features

? Low EMI: Meets CISPR-11 and CISPR-25

standards

? Safety-related certifications:

– 6000VPK reinforced isolation per DIN EN IEC

60747-17 (VDE 0884-17)

– 4250VRMS isolation for 1 minute per UL1577

2 Applications

? Compact, isolated shunt-based current sensing in:

– HEV/EV onboard chargers (OBC)

– HEV/EV DC/DC converters

– HEV/EV traction inverters

– HEV/EV battery management system (BMS)

3 Description

The AMC3306M25-Q1 is a precision, isolated deltasigma

(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 DIN EN IEC 60747-17 (VDE 0884-17)

and UL1577 and supports a working voltage up to

1.2kVRMS.

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-Q1 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 measurements over the extended industrial

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

Use a digital filter (such as a sinc3 filter) to decimate

the bitstream. By using this digital filter, the device

achieves 16 bits of resolution with an 85dB dynamic

range at a data rate of 78kSPS.