PETALUMA (MAXREFDES30#): 8-channel simultaneous sampling analog front end

Overview

Three-phase power measurement applications require multiple analog inputs to measure the voltage and current on each line in the three-phase system. Power monitoring systems must sample all analog inputs simultaneously to calculate instantaneous power consumption with high accuracy.

The Petaluma (MAXREFDES30#) subsystem reference design provides eight high-speed, 250ksps, 16-bit simultaneous sampling analog inputs and supports ±10V input signals.

The Petaluma design uses two quad ultra-high-precision, ultra-low-noise input buffers ( MAX44252 ); an eight-channel, 16-bit simultaneous-sampling ADC ( MAX11046B ); an ultra-precision 4.096V voltage reference ( MAX6126 ); and a +10V, -10V and +5V linear regulated power supplies ( MAX1659 ,  MAX765 /LM337, MAX8881 ). In addition to three-phase power measurement applications, the subsystem is also well suited for any other application that requires multiple simultaneous sampling of analog inputs, such as multiphase motor control and industrial vibration detection.