Texas Instruments

AMC131M03 24-Bit Isolated Delta-Sigma ADC

Texas Instruments' three-channel ADC features differential or single-ended inputs

Image of Texas Instruments' AMC131M03 24-Bit Isolated Delta-Sigma ADCTexas Instruments' AMC131M03 is a precision three-channel, data- and power-isolated, simultaneous-sampling, 24-bit, delta-sigma (ΔΣ) analog-to-digital converter (ADC). The AMC131M03 offers a wide dynamic range, low power, and energy-measurement-specific features designed for energy metering and power metrology applications. Due to the high input impedance, the ADC inputs can be directly interfaced with a resistor-divider network or a shunt current sensor.

The AMC131M03 features a fully integrated isolated DC/DC converter that allows single-supply operation from the low-side of the device. The reinforced capacitive isolation barrier is certified according to VDE 0884-17 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, making the AMC131M03 an excellent choice for polyphase energy metering applications using shunt current sensors.

Features
  • Three isolated simultaneous-sampling ΔΣ ADCs with differential or single-ended inputs
  • Single-supply operation (3.3 V or 5 V) with an integrated DC/DC converter
  • Low EMI: meets CISPR-11 and CISPR-25 standards
  • Programmable data rate: up to 64 kSPS
  • Programmable gain: up to 128
  • Low-drift internal voltage reference
  • Internal temperature sensor
  • 4-wire serial peripheral interface (SPI) with cyclic redundancy check (CRC)
  • Safety-related certifications
    • Reinforced isolation: 7,070 VPEAK per DIN EN IEC 60747-17 (VDE 0884-17)
    • Isolation: 5,000 VRMS for 1 minute per UL1577
  • Package: 20-pin wide-body SOIC
  • Operating temperature range: -40°C to +125°C
Applications
  • Commercial and residential electricity meters
  • Circuit breakers
  • EV charging stations
  • Battery management systems
Published: 2024-07-22