MAX31865AAP+

MAX31865AAP+ is a RTD-to-digital converter. It is an easy-to-use resistance-to-digital converter optimized for platinum resistance temperature detectors (RTDs). An external resistor sets the sensitivity for the RTD being used and a precision delta-sigma ADC converts the ratio of the RTD resistance to the reference resistance into digital form. The MAX31865’s inputs are protected against overvoltage faults as large as ±45V. Programmable detection of RTD and cable open and short conditions is included. Applications include industrial equipment, medical equipment, instrumentation.

• Integration lowers system cost, simplifies design efforts, and reduces design cycle time
• Simple conversion of platinum RTD resistance to digital value
• Handles 100 ohm to 1Kohm (at 0°C) platinum RTDs (PT100 to PT1000)
• Compatible with 2, 3, and 4-wire sensor connections
• SPI-compatible interface
• High accuracy facilitates meeting error budgets
• 15-bit ADC resolution; nominal temperature resolution 0.03125°C (varies due to RTD nonlinearity)
• Total accuracy over all operating conditions: 0.5°C (0.05% of full scale) max
• Fully differential VREF inputs, 21ms (max) conversion time
• 20 SSOP package, -40°C to +125°C temperature range

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