Global Sources
EE Times-India
EE Times-India > EDA/IP

AFE reference design targets 3-phase power monitoring apps

Posted: 02 May 2014     Print Version  Bookmark and Share

Keywords:Maxim  reference design  power monitoring 

Maxim has unveiled its Petaluma (MAXREFDES30#) 8-channel subsystem reference design that the company describes as a cost-optimised, high-speed and high-accuracy analogue measurement solution for three-phase power monitoring applications. Hardware, firmware, design files and lab measurements are included.

Three-phase power measurement applications require multiple analogue inputs for voltage and current measurements on each line of the three-phase system. A power monitoring system must sample all of the analogue inputs simultaneously to accurately calculate the instantaneous power consumption.

The Petaluma subsystem reference design provides eight high-speed, 250Ksps, 16bit simultaneous-sampling analogue input channels that accept ±10V input signals.

Petaluma subsystem reference design

The Petaluma design uses two quadruple ultra-precision, ultra-low-noise input buffers (MAX44252); an 8-channel, 16bit simultaneous-sampling ADC (MAX11046B); an ultra-high precision 4.096V voltage reference (MAX6126); and regulated 10V, -10V and 5V power rails (MAX1659, MAX765/LM337, MAX8881). In addition to three-phase power measurement applications, this subsystem also performs well in any application that requires multiple simultaneous sampling of analogue inputs such as multiphase motor control and industrial vibration sensing.

The MAX44252 devices (U1 and U2) are quadruple ultra-precision, low-noise op amps. The op amps attenuate and buffer the ±10V input signals to match the input range of the ADC (MAX11046). The MAX44252 devices are set up in the inverting configuration, so the polarity of the signal is reversed at the input of the ADC. The MAX11046 (U3) is a low-cost, 8-channel, 250Ksps, 16bit, single-supply, bipolar, simultaneous-sampling ADC.

Although the MAX11046 ADC has an internal 4.096V voltage reference, Petaluma uses an external MAX6126 (U4) voltage reference to provide the highest possible accuracy. The MAX6126 has an initial accuracy of 0.02 per cent and a 3ppm/°C maximum temperature coefficient. Petaluma connects to FMC-compatible FPGA/MCU development boards.

- Graham Prophet
  EE Times Europe

Comment on "AFE reference design targets 3-phase..."
*  You can enter [0] more charecters.
*Verify code:


Visit Asia Webinars to learn about the latest in technology and get practical design tips.


Go to top             Connect on Facebook      Follow us on Twitter      Follow us on Orkut

Back to Top