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TI's ADS131E08 offers Low-Power, High-Precision Smart E-Metering Solution

19th July 2012

Nat Bowers

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TI have announced today a new family of analogue front ends for power monitoring and control of smart e-meters. 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 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 32-bit C2000 TMS320F2812 high-performance microcontroller, 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. A free sample kit of the smart metering solution is available today.

Key features and benefits of the ADS131E08 e-metering AFE family:

•Highest all-around precision performance enabled by the best combination of AC/DC specifications: best-in-class 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.
•Lowest power consumption available at 2 mW per channel with an operating temperature range of -40 to 105 C.

•Widest upgrade/downgrade path, with 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.

•Lowest price per channel by 40 percent at $0.74.

•Reduces board space and overall solution size by integrating a delta-sigma analog-to-digital converter, FET-input programmable gain amplifier with multi-gain options, operational amplifier, internal reference, fault detection and alarm comparators.

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

All devices in the ADS131E08 family are available today in a 9-mm x 9-mm TQFP package. Suggested retail pricing for 1,000-unit quantities is as follows:
•8-channel, 24-bit ADS131E08: US$5.95
•6-channel, 24-bit ADS131E06: US$4.95
•4-channel, 24-bit ADS131E04: US$3.95
•8-channel, 16-bit ADS130E08: US$3.95