Texas Instruments AMC3306M25/AMC3306M25-Q1 Delta-Sigma Modulator
Texas Instruments AMC3306M25/AMC3306M25-Q1 Precision Delta-Sigma (ΔΣ) Modulator is optimized for shunt-based current measurements. The device has a fully integrated isolated DC/DC converter that allows single-supply operation from the device's low side. The reinforced capacitive isolation barrier is certified according to VDE V 0884-11 and UL1577. This isolation barrier separates parts of the system that operate on different common-mode voltage levels and protects lower-voltage parts from damage. The Texas Instruments AMC3306M25/AMC3306M25-Q1 input is optimized for direct connection to shunt resistors or other low-voltage-level signal sources. The integrated isolated DC/DC converter allows unconstrained shunt placement, independent of any high-side supply usually required to power the isolated modulator. This feature makes the device a unique solution for space-constrained applications.
The device supports excellent AC and DC performance over its linear input voltage range of ±250mV. By using a digital filter or delta-sigma-filter module (such as those integrated into the TMS320F2807x or TMS320F2837x microcontroller families) to decimate the bitstream, the device can achieve 16 bits of resolution with a dynamic range of 85dB at a data rate of 78kSPS. The AMC3306M25/AMC3306M25-Q1 is fully specified over the extended industrial temperature range of –40°C to +125°C. The AMC3306M25-Q1 devices are AEC-Q100 qualified for automotive applications.
Features
- 3.3V or 5V single supply with integrated DC/DC converter
- ±250mV input voltage range optimized for current measurement using shunt resistors
- Low DC errors
- ±50µV (max) offset error
- ±1µV/°C (max) offset drift
- ±0.2% (max) gain error
- ±35ppm/°C (max) gain drift
- 75kV/µs (min) high CMTI
- System-level diagnostic features
- Safety-related certifications
- 6000VPEAK reinforced isolation per DIN VDE V 0884-11
- 4250VRMS isolation for 1 minute per UL1577
- Meets CISPR-11 and CISPR-25 EMI standards
Applications
- Compact, isolated shunt-based current sensing in
- Photovoltaic inverters
- Compact frequency inverters
- Uninterruptible power supplies (UPS)
- Power delivery systems
- Industrial robots
Functional Block Diagram
Development Tool
Texas Instruments AMC3306EVM/AMC3336EVM Amplifier Evaluation Modules
For evaluating the AMC3306/AMC3336, an isolated amplifier with an integrated DC/DC converter.
Publicerad: 2020-12-02
| Uppdaterad: 2025-05-15