Datasheet
MAX31850/MAX31851
Cold-Junction Compensated, 1-Wire
Thermocouple-to-Digital Converters
2Maxim Integrated
Supply Voltage Range (V
DD
to GND) .................. -0.3V to +4.0V
All Other Pins ............................................ -0.3V to (V
DD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70NC)
TDFN (derate 16.70mW/NC above +70NC) ........... 1333.30mW
ESD Protection (All Pins, Human Body Model) ...................±2kV
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range .......................... -65NC to +150NC
Lead Temperature (soldering, 10s) ................................+300NC
Soldering Temperature (reflow) .....................................+260NC
TDFN
Junction-to-Ambient Thermal Resistance (B
JA
) ..........60NC/W
Junction-to-Case Thermal Resistance (B
JC
) ...............30NC/W
ABSOLUTE MAXIMUM RATINGS
Note 1: Package thermal resistances were obtained using the method described in JEDEC specification JESD51-7, using a four-layer
board. For detailed information on package thermal considerations, refer to www.maximintegrated.com/thermal-tutorial.
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional opera-
tion of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute
maximum rating conditions for extended periods may affect device reliability.
PACKAGE THERMAL CHARACTERISTICS (Note 1)
DC ELECTRICAL CHARACTERISTICS
(T
A
= -40NC to +125NC, unless otherwise noted.) (Note 2)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Supply Voltage V
DD
Local power (Note 3, 4) 3.0 3.3 3.7 V
Pullup Supply Voltage
(Notes 3, 4)
V
PU
Parasite power (Note 3) 3.0 3.7
V
Local power (Note 3) 3.0 V
DD
Input Logic-Low V
IL
(Notes 4, 6) -0.3 +0.8 V
Input Logic-High (Note 4) V
IH
Local power 2.2
lower
of 3.7V
or
(V
DD
+
0.3V)
V
Parasite power 3.0
lower
of 3.7V
or
(V
DD
+
0.3V)
Output Sink Current I
L
V
I/O
= 0.4V (Note 4) 4.0 mA
Standby Supply Current I
DDS
(Notes 7, 8) 280 1000 nA
Active Supply Current I
DD
V
DD
= 3.7V (Note 9) 900 1750
FA
DQ Input Current I
DQ
(Note 10) 5
FA
Power-Supply Rejection -0.3
°C/V
Input Leakage Current (AD0–AD3 Pins) (Note 3) -1 +1
FA
Thermocouple Input Bias Current I
BTC
T
A
= -40°C to +125°C, 100mV across
the thermocouple inputs (Note 3)
-100 +100 nA