Datasheet

MAX31865
RTD-to-Digital Converter
2Maxim Integrated
Voltage Range on V
DD
Relative to GND1 ............-0.3V to +4.0V
Voltage Range on BIAS, REFIN+,
REFIN-, ISENSOR ................................. -0.3V to (V
DD
+ 0.3V)
Voltage Range on FORCE+, FORCE2,
FORCE-, RTDIN+, RTDIN- Relative to GND1 ....-50V to +50V
Voltage Range on DVDD Relative to DGND ........ -0.3V to +4.0V
Voltage Range on All Digital Pins
Relative to DGND ............................. -0.3V to (V
DVDD
+ 0.3V)
Continuous Power Dissipation (T
A
= +70NC)
TQFN (derate 34.5mW/NC above +70NC)...............2758.6mW
ESD Protection (all pins, Human Body Model) ...................±2kV
Operating Temperature Range ........................ -40NC to +125NC
Junction Temperature .....................................................+150NC
Storage Temperature Range ............................ -65NC to +150NC
Soldering Temperature (reflow) ......................................+260NC
Lead Temperature (soldering,10s) .................................+300NC
TQFN
Junction-to-Ambient Thermal Resistance (q
JA
) ..........29°C/W
Junction-to-Case Thermal Resistance (q
JC
) .................2°C/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)
RECOMMENDED DC OPERATING CONDITIONS
(T
A
= -40NC to +125NC, unless otherwise noted.) (Notes 2 and 3)
ELECTRICAL CHARACTERISTICS
(3.0V P V
DD
P 3.6V, T
A
= -40NC to +125NC, unless otherwise noted. Typical values are T
A
= +25NC, V
DD
= V
DVDD
= 3.3V.) (Notes 2
and 3)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
DD
V
DD
3.0 3.3 3.6 V
DVDD V
DVDD
3.0 3.3 3.6 V
Input Logic 0 V
IL
CS, SDI, SCLK
-0.3
0.3 x
V
DVDD
V
Input Logic 1 V
IH
CS, SDI, SCLK
0.7 x
V
DVDD
V
DVDD
+ 0.3
V
Analog Voltages
(FORCE+,FORCE2, FORCE-,
RTDIN+, RTDIN-)
Normal conversion results 0 V
BIAS
V
Reference Resistor R
REF
350 10k
I
Cable Resistance R
CABLE
Per lead 0 50
I
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
ADC Resolution No missing codes 15 Bits
ADC Full-Scale Input Voltage
(RTDIN+ - RTDIN-)
REFIN+ -
REFIN-
V