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Chipset eliminates current transformers in polyphase energy meters

Sunnyvale, Calif.—Maxim Integrated Products has introduced a chipset, the MAXQ3108 and DS8102, that reduces the bill of materials (BOM) cost of a polyphase energy meter. Together, the MAXQ3108 and DS8102 replace three high-cost current transformers with three low-cost shunts to save both cost and space.

The DS8102 contains two high-precision second-order delta-sigma modulators with programmable gains up to 32x. The modulators' outputs are encoded into a single bit stream to minimize the isolation and data-coupling cost. The data processing is carried out in the MAXQ3108, a dual-core microcontroller that accepts three DS8102 output bit streams, then decodes and decimates that data to produce raw ADC samples across a wide dynamic range. The ADC samples are fed into the MAXQ3108's integrated digital signal processor that computes the power, energy, power factors, and RMS voltage and current parameters required for a multifunction electricity meter.

The MAXQ3108 is packaged in a 28-pin TSSOP and the DS8102 in a 16-pin TSSOP. Both devices operate over the -40°C to +85°C temperature range.

Pricing: $2.43 for the MAXQ3108 and $1.17 for the DS8102 (1000-up, FOB USA).
Availability: Now.
Datasheets: DS8102 and MAXQ3108.

Maxim Integrated Products, www.maxim-ic.com

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