ADS131M08 8-CHANNEL SIMULTANEOUS SAMPLING DELTA-SIGMA (ΔΣ) ADC

Texas Instruments’ 24-bit, 32 kSPS ADC is optimized for cost-sensitive applications that require simultaneous sampling

Texas Instruments’ ADS131M08 8-channel, simultaneously-sampling, 24-bit ΔΣ ADC offers wide dynamic range, low power, and energy-measurement-specific features. These features make the device ideal for energy metering, power metrology, and circuit breaker applications. The ADC inputs can be directly interfaced with a resistor-divider network or a power transformer to measure voltage or to a current transformer or a Rogowski coil to measure current.

The individual ADC channels can be independently configured depending on the sensor input. A low-noise programmable gain amplifier (PGA) provides gains ranging from 1 to 128 to amplify low-level signals. This device integrates channel-to-channel phase calibration and offset and gain calibration registers to help remove signal-chain errors.

Features

  • Eight simultaneously sampling differential inputs
  • Programmable data-rate up to 32 kSPS
  • Programmable gain up to 128
  • Noise performance:
    • Dynamic ranges: 102 dB (gain = 1, 4 kSPS), 80 dB (gain = 64, 4 kSPS)
  • High-impedance inputs for direct sensor connection:
    • Input impedance for gains of 1, 2, and 4 (330 kΩ), 8, 16, 32, and 64 (1 MΩ)
  • Programmable channel-to-channel phase delay calibration:
    • 244 ns resolution, 8.192 MHz fCLKINTotal harmonic distortion: -100 dB
  • Current-detect mode allows for extremely low power tamper detection
  • Fast startup: first data within 0.5 ms of the supply ramp
  • Integrated negative charge pump allows input signals below ground
  • Crosstalk between channels: -120 dB
  • Low-drift internal voltage reference
  • CRC on communications and the register map
  • Analog and digital supplies: 2.7 V to 3.6 V
  • Low power consumption: 6.0 mW at 3 V AVDD and DVDD
  • Package: 32-pin TQFP or 32-pin WQFN
  • Operating temperature range: -40°C to +125°C

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