MAX1464 Sensor Signal Processor

By Maxim Integrated 234

MAX1464 Sensor Signal Processor

Maxim's MAX1464 is a highly integrated, low-power, low-noise multichannel sensor signal processor optimized for industrial, automotive, and process-control applications such as pressure sensing and compensation, RTD and thermocouple linearization, weight sensing and classification, and remote process monitoring with limit indication.

The MAX1464 accepts sensors with either single-ended or differential outputs. The MAX1464 accommodates sensor output sensitivities from 1 mV/V to 1 V/V. The MAX1464 provides amplification, calibration, signal linearization, and temperature compensation enabling an overall performance approaching the inherent repeatability of the sensor without requiring any external trim components.

Two 16-bit voltage-output DACs and two 12-bit PWMs can be used to indicate each of the temperature-compensated sensor signals independently, as a sum or difference signal, or user-defined relationship between each signal and temperature. Uncommitted op amps are available to buffer the DAC outputs, drive heavier external loads, or provide additional gain and filtering.

The MAX1464 incorporates a 16-bit CPU, 4 kB of user-programmable Flash program memory, 128 bytes of Flash user information, one 16-bit ADC, two 16-bit DACs, two 12-bit PWM digital outputs, four rail-to-rail op amps, one SPI™-compatible interface, two GPIOs, and one on-chip temperature sensor.

The MAX1464 operates from a single 5.0 V (typ) supply and is packaged for automotive, industrial, and commercial temperature ranges in a 28-pin SSOP package.

  • Programmable amplification, calibration, linearization, and temperature compensation
  • Two differential or four single-ended ADC input channels
  • Accommodates sensor output sensitivities from 1 mV/V to 1 V/V
  • Two DAC/PWM output signal channels
  • Supports 4-20 mA current loop applications
  • 4 kB of Flash memory for code and coefficients
  • 128 bytes of Flash memory for user information
  • Integrated temperature sensing
  • Flexible dual op-amp block
  • Programmable sensor input gain and offset
  • Programmable sensor sampling rate and resolution
  • No external trim components required
  • Calibrators and controllers
  • GMR and MR magnetic direction sensors
  • Pressure sensor signal conditioning
  • Process indicators
  • Thermocouple and RTD linearization
  • Transducers and transmitters
  • Weight measurement systems

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