Introduction

Weigh scales perform the critical function of mass measurement for a

wide variety of industrial applications. From ultra-small reactant

amounts to large cargo containers, weighing provides key information

in an array of processes from chemical reactions to commodity

management. The critical component of any modern weigh scale is

the analog-to-digital converter. The MAXREFDES75# brings a full 24-

bit ADC into a high-performance system performing small-signal

(down to ±25mV full scale) 24-bit measurements, while generating

the high-voltage sensor supply, and producing a 0 to 10V output

proportional to the input signal.

The MAXREFDES75# reference design features:

• Ratiometric measurement or measurement compared to a

precision voltage reference

• User-programmable offset and gain calibration for sensor (load

cell)

• User-programmable offset and gain calibration for DAC

• User-programmable voltage output range mapping

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MAXREFDES75# System Board

MAX11270

• 24-bit resolution, 64ksps