MAX31856 Precision Thermocouple to Digital Converter with Linearization Electrical Characteristics (continued) (3.0V ≤ VDD ≤ 3.6V, TA = -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4) PARAMETERSYMBOLCONDITIONSMINTYPMAXUNITS TA = +25°C ±0.2 Thermocouple Input Differential TA = -40°C to +85°C -4 +4 Bias Current (Note 4) ITCIDBIAS nA TA = -55°C to +105°C -5.5 +5.5 TA = -55°C to +125°C -10 +10 AV = 8 1.3 Input-Referred Noise VN µVRMS AV = 32 0.4 Power-Supply Rejection PSR Cold-junction sensor 0.15 °C/V Power-On-Reset Voltage Threshold VPOR 2.7 2.85 V Power-On-Reset Voltage Hysteresis VHYST 0.1 V Bias Voltage VBIAS 0.735 V BIAS Output Resistance RBIAS 2 kΩ Input Common-Mode Range 0.5 1.4 V TA = +25°C -0.05 +0.05 TA = -20°C to +85°C -0.15 +0.15 Full-Scale and INL Error (Note 6) TA = -40°C to +105°C -0.2 +0.2 %FS TA = -40°C to +125°C -0.3 +0.3 TA = -55°C to +125°C -0.35 +0.35 TA = +25°C -0.01 +0.01 T = -20°C to +85°C -0.015 +0.015 Input Offset Voltage (Note 7) A %FS TA = -40°C to +105°C -0.017 +0.017 TA = -55°C to +125°C -0.02 +0.02 TA = +25°C -7.8 +7.8 T = -20°C to +85°C -11.7 +11.7 AV = 8 A TA = -40°C to +105°C -13.3 +13.3 T = -55°C to +125°C -15.6 +15.6 Input Offset Voltage A µV TA = +25°C -2.0 +2.0 T = -20°C to +85°C -2.9 +2.9 AV = 32 A TA = -40°C to +105°C -3.3 +3.3 TA = -55°C to +125°C -3.9 +3.9 TA = -20°C to +85°C -0.7 +0.7 Cold-Junction Temperature Error TA = -40°C to +105°C -1 +1 °C TA = -55°C to +125°C -2 +2 Overvoltage Rising Threshold VAVDD – VAVDD + VAVDD (Note 8) 0.1 0.17 + 0.35 V Overvoltage Hysteresis 0.09 V www.maximintegrated.com Maxim Integrated │
