Low power high precision smart e-metering solution from TI


Dallas, TX, U.S.A. — (METERING.COM) — July 20, 2012 – A new line of analog front ends (AFEs) for power monitoring and control of smart e-meters has been introduced by Texas Instruments Inc.

The new ADS131E08 family is available with 8, 6 or 4 channels and in 16- or 24-bit resolution. The devices offer high integration and performance, along with low power consumption per channel and wide upgrade/downgrade path.
When combined with the AMC1100 isolation amplifier, quad-channel ISO7241C digital isolator and 32-bit C2000(TM) TMS320F2812 high-performance microcontroller (MCU), the new ADS131E08 family provides a three-phase class 1.0 and 0.5 smart e-metering solution that minimizes power consumption while providing high linearity for accurate power measurement.

The solution also delivers the high voltage isolation required to meet industry standards for power and communications in high-end industrial meters and smart grid infrastructure.

Technical features include:

  • Signal-to-noise ratio of 107 dB, ENOB of up to 20.4 bits, input signal range of +/-2.4 V and common mode rejection ratio of -110 dB. This high level of performance allows the AFEs to exceed 0.1 e-metering performance with less than 0.1 percent error for 1 to 1,000 dynamic range
  • Power consumption of 2 mW per channel with an operating temperature range of -40 to 105 C
  • Upgrade/downgrade path options ranging from 4 to 8 channels and 16 to 24 bits of resolution, to support a variety of smart e-metering applications, from two-phase systems to three-phase with tamper detection.

Board space and overall solution size is reduced by integrating a delta-sigma analog-to-digital converter (ADC), FET-input programmable gain amplifier (PGA) with multi-gain options, operational amplifier (op amp), internal reference, fault detection and alarm comparators.