ADS131M02IPWR

The ADS131M02 is a two-channel, synchronous-sampling, 24-bit, Δ-Σ ADC with wide dynamic range, low power consumption, and energy measurement-specific features, making it ideal for energy metering, power metering, and circuit breaker applications. The ADC inputs can be connected directly to resistor divider networks or power transformers for voltage measurement, or to current transformers, shunts, or Rogowski coils for current measurement. Individual ADC channels can be independently configured for each sensor input. A low-noise, programmable gain amplifier (PGA) provides gains from 1 to 128 to amplify low-level signals. In addition, the device integrates inter-channel phase calibration, offset, and gain calibration registers to help eliminate signal chain errors. The device integrates a low-drift, 1.2V reference to reduce PCB area. Optional CRC in the data input, data output, and register map ensures communication integrity. The complete AFE is available in a 20-pin TSSOP package or a leadless 20-pin WQFN package, rated for an industrial temperature range of –40°C to +125°C.

Applications

• Electricity meters: commercial and residential
• Circuit breakers
• Protection relays
• Power quality monitors
• Battery test equipment
• Battery management systems

Key features

• 2 synchronous sampling differential inputs
• Programmable data rate up to 64kSPS
• Programmable gain up to 128
• Noise performance: dynamic range of 102dB at gain = 1, 4kSPS; dynamic range of 80dB at gain = 64, 4kSPS
• Total harmonic distortion: -100dB
• High-impedance inputs for direct sensor connection: 330kΩ input impedance at gain = 1, 2, and 4; ≥ 1MΩ input impedance at gain = 8, 16, 32, 64, and 128
• Programmable inter-channel phase delay calibration: 244ns resolution at fCLKIN = 8.192MHz
• Current monitoring mode for ultra-low-power tamper detection
• Integrated negative charge pump allows input signals below ground
• Inter-channel crosstalk: -120dB
• Low-drift internal voltage reference
• CRC for communication and register map
• 2.7V to 3.6V analog and digital supply
• Low power: 2.3mW at 3V AVDD and DVDD
• Package: 20-lead TSSOP or 20-lead WQFN
• Operating temperature range: –40°C to +125°C