ADC Digital Converter Chip For Medical Equipment Instruments MAX31865ATP+T
The MAX31865 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, while a precision Δ-Σ ADC converts the RTD resistance ratio to reference resistance into digital form.
The MAX31865 inputs are protected against overvoltage faults up to ±45V. It includes programmable detection for RTD and cable open/short conditions.
| Attribute | Value |
|---|---|
| Product Type | Analog-to-Digital Converter/Digital-to-Analog Converter |
| Package Size | 3x3mm, 5x5mm, 8x8mm |
| Operating Temperature Range | -40°C to 85°C |
| Applications | Data acquisition, instrumentation, audio processing, communication systems |
| Resolution | 8-bit, 10-bit, 12-bit, 16-bit |
| Features | Low power consumption, high accuracy, low noise, programmable gain |
| Package Type | QFN, TQFP, SOIC |
| Interface | SPI, I2C, Parallel |
| Power Supply | 3.3V, 5V |
- Integrated solution reduces system cost, simplifies design work, and shortens design cycles
- Converts platinum RTD resistance directly to digital value
- Supports 100Ω to 1kΩ platinum RTDs (PT100 to PT1000 at 0°C)
- Compatible with 2-wire, 3-wire, and 4-wire sensor connections
- SPI-compatible interface
- Available in 20-pin TQFN and SSOP packages
- High accuracy meets error budgets: 15-bit ADC resolution with nominal temperature resolution of 0.03125°C
- ±45V input protection and built-in fault detection enhance system reliability
VDD to GND1 voltage range: -0.3V to +4.0V
BIAS, REFIN+, REFIN-, ISENSOR voltage range: -0.3V to (VDD + 0.3V)
FORCE+, FORCE2, FORCE-, RTDIN+, RTDIN- to GND1 voltage range: -50V to +50V
Continuous power dissipation (TA = +70°C): 2758.6mW (TQFN), 952.4mW (SSOP)
ESD protection (all pins, HBM): ±2kV
Operating temperature range: -40°C to +125°C
Junction temperature: +150°C
Storage temperature range: -65°C to +150°C
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