PDF《典型应用》

8 1.3 ?VRMS 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 k? Input Common-Mode Range 0.5 1.4 V Full-Scale and INL Error (Note 6) TA = +25°C -0.05 +0.05 %FS TA = -20°C to +85°C -0.15 +0.15 TA = -40°C to +105°C -0.2 +0.2 TA = -40°C to +125°C -0.3 +0.3 TA = -55°C to +125°C -0.35 +0.35 Input Offset Voltage (Note 7) TA = +25°C -0.01 +0.01 %FS TA = -20°C to +85°C -0.015 +0.015 TA = -40°C to +105°C -0.017 +0.017 TA = -55°C to +125°C -0.02 +0.02 Input Offset Voltage AV =

8 TA = +25°C -7.8 +7.8 ?V TA = -20°C to +85°C -11.7 +11.7 TA = -40°C to +105°C -13.3 +13.3 TA = -55°C to +125°C -15.6 +15.6 AV =

32 TA = +25°C -2.0 +2.0 TA = -20°C to +85°C -2.9 +2.9 TA = -40°C to +105°C -3.3 +3.3 TA = -55°C to +125°C -3.9 +3.9 Cold-Junction Temperature Error TA = -20°C to +85°C -0.7 +0.7 °C TA = -40°C to +105°C -1 +1 TA = -55°C to +125°C -2 +2 Overvoltage Rising Threshold (Note 8) VAVDD C 0.1 VAVDD + 0.17 VAVDD + 0.35 V Overvoltage Hysteresis 0.09 V ??

3 www.maximintegrated.com/cn Electrical Characteristics (continued) (3.0V ≤ VDD ≤ 3.6V, TA = -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Undervoltage Falling Edge Threshhold (Note 8) -0.3 -0.17

0 V Undervoltage Hysteresis 0.09 V Thermocouple Linearity Correction Error Type B, TA =

0 to 125°C, TTC = 95°C to +1798°C -0.24 +0.25 °C Type E, TA = -55°C to +125°C TTC = -200°C to +1000°C -0.14 +0.06 Type J, TA = -55°C to +125°C TTC = -210°C to +1200°C -0.11 +0.10 Type K, TA = -55°C to +125°C TTC = -200°C to +1372°C -0.13 +0.12 Type N, TA = -55°C to +125°C TTC = -200°C to +1300°C -0.09 +0.08 Type R, TA = -50°C to +125°C TTC = -50°C to +1768°C -0.19 +0.17 Type S, TA = -50°C to +125°C TTC = -50°C to +1768°C -0.16 +0.20 Type T, TA = -55°C to +125°C TTC = -200°C to +400°C -0.07 +0.07 Temperature Conversion Time (Thermocouple + Cold Junction) tCONV 1-Shot conversion or first conversion in auto-conversion mode (60Hz)

143 155 ms 1-Shot conversion or first conversion in auto-conversion mode (50Hz)

169 185 Auto conversion mode, conversions

2 through n (60Hz)

82 90 Auto conversion mode, conversions

2 through n (50Hz)

98 110 ??

4 www.maximintegrated.com/cn Electrical Characteristics (continued) Note 2: All voltages are referenced to GND. Currents entering the IC are specified positive, and currents exiting the IC are negative. Note 3: All Serial Interface timing specifications are guaranteed by design. Note 4: Specification is 100% tested at TA = +25°C. Specification limits over temperature (TA = TMIN to TMAX) are guaranteed by design and characterization;

not production tested. Note 5: For all pins except T+ and T- (see the Thermocouple Input Bias Current parameter in the Electrical Characteristics table. Note 6: Using a common-mode voltage other than VBIAS will change this specification. See the Typical Operating Characteristics for details. Note 7: Input-referred full-scale voltage is 78.125mV when AV =

8 and is 19.531mV when AV = 32. Note 8: Overvoltage and undervoltage limits apply to T+, T-, and BIAS pins. (3.0V ≤ VDD ≤ 3.6V, TA = -55°C to +125°C, unless otherwise noted.)(Notes 2, 3, and 4) PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Common-Mode Rejection CMR 0.5V ≤ VCM ≤ 1.4V

70 dB 50/60Hz Noise Rejection Fundamental and harmonics

91 dB SERIAL INTERFACE Input Leakage Current ILEAK (Note 5) -1 +1 ?A Output High Voltage VOH IOUT = -1.6mA VCC - 0.4 V Output Low Voltage VOL IOUT = 1.6mA 0.4 V Input Capacitance CIN