ADS131M08IPBSR

The ADS131M08 is an eight-channel, simultaneous-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 directly connected to resistor divider networks or power transformers for voltage measurement, or to current transformers or Rogowski coils for current measurement. Individual ADC channels can be independently configured for their respective sensor inputs. A low-noise, programmable gain amplifier (PGA) provides gain settings 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 cyclic redundancy check (CRC) on data input, data output, and register map ensures communication integrity. The complete analog front end (AFE) is available in a 32-pin TQFP package or a leadless 32-pin WQFN package, rated for an industrial temperature range of –40°C to +125°C.

Applications

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

Key features

• 8 simultaneous sampling differential inputs
• Programmable data rate up to 32kSPS
• 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
• Fast startup: first data within 0.5ms of voltage ramp-up
• 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: 6.0mW at 3V AVDD and DVDD
• Package: 32-pin TQFP or 32-pin WQFN
• Operating temperature range: -40°C to +125°C