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TI rolls AFEs for power monitoring, smart e-meter control

25 Jul 2012

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Texas Instruments Inc. (TI) has announced a series of analog front ends (AFEs) for power monitoring and control of smart e-meters. The ADS131E08 family comes with 8, 6 or 4 channels and in 16 or 24bit resolution that claims to offer high integration and performance, along with the industry's lowest power consumption per channel and widest upgrade/downgrade path.

When combined with the AMC1100 isolation amplifier, quad-channel ISO7241C digital isolator and 32bit C2000 TMS320F2812 high-performance MCU, the 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, stated TI. 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.

The ADS131E08 e-metering AFE family features signal-to-noise ratio of 107dB, ENOB of up to 20.4 bits, input signal range of ±2.4V and common mode rejection ratio of -110dB. This allows the AFEs to exceed 0.1 e-metering performance with less than 0.1 percent error for 1 to 1,000 dynamic range. Lowest power consumption available at 2mW per channel with an operating temperature range of -40°C to 105°C, noted the company.

In addition, the devices reduce board space and overall solution size by integrating a delta-sigma ADC, FET-input programmable gain amplifier (PGA) with multigain options, operational amplifier (op amp), internal reference, fault detection and alarm comparators, TI added.

The ADS131E08EVM-PDK demonstration kit is available to speed hardware evaluation and system development, along with an IBIS model for $199.

All devices in the ADS131E08 family are available in a 9x9mm TQFP package. Suggested retail pricing for 1,000-unit quantities for the 8-channel, 24bit ADS131E08 is $5.95; 6-channel, 24bit ADS131E06 is $4.95; 4-channel, 24bit ADS131E04 is $3.95; and 8-channel, 16bit ADS130E08 is $3.95.

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