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SUBSYSTEM BOARD 5827

Petaluma (MAXREFDES30#): 8-Channel Simultaneous-

Sampling Analog Front End

Apr 28, 2014

Abstract: The Petaluma (MAXREFDES30#) subsystem reference design is a cost optimized, high-speed and high-accuracy analog

measurement solution for three-phase power monitoring applications. Hardware, firmware, design files, and lab measurements

provide complete system information for rapid prototyping and development.

Introduction

Three-phase power measurement applications require

multiple analog inputs for voltage and current

measurements on each line of the three-phase system. A

power monitoring system must sample all of the analog

inputs simultaneously to accurately calculate the

instantaneous power consumption.

The Petaluma (MAXREFDES30#) subsystem reference

design provides eight high-speed, 250ksps, 16-bit

simultaneous-sampling analog input channels that accept

±10V input signals.

The Petaluma design utilizes two quadruple ultra-precision,

ultra-low-noise input buffers (MAX44252); an 8-channel,

16-bit 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 analog inputs, such as

multiphase motor control and industrial vibration sensing.

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