Datasheet

MAX31865
RTD-to-Digital Converter
6Maxim Integrated
Typical Operating Characteristics
(V
DD
= V
DVDD
= 3.3V, T
A
= +25°C, unless otherwise noted.)
ADC CONVERSION ERROR vs. RTD RESISTANCE
(400Ω R
REF
, 4-WIRE CONNECTION)
MAX31865 toc06
R
RTD
(Ω)
ERROR (Ω)
30025020015010050
-0.244
0
0.244
˜
±0.1°C
ERROR
0.488
-0.488
0 350
+25°C
-40°C
+100°C
ADC CONVERSION ERROR vs. RTD RESISTANCE
(4kΩ R
REF
, 4-WIRE CONNECTION)
MAX31865 toc05
R
RTD
(Ω)
ERROR (Ω)
30002500200015001000500
-0.244
0
0.244
˜
±0.1°C
ERROR
0.488
-0.488
0 3500
+25°C
-40°C
+100°C
SINC FILTER OPERATION
INPUT FREQUENCY vs. NOISE RESPONSE
MAX31865 toc04
INPUT NOISE FREQUENCY (Hz)
NOISE RESPONSE (dB)
1309050
-80
-60
-40
-20
0
20
-100
10 170
60Hz
50Hz
LEAKAGE CURRENT PER PIN vs. TEMPERATURE
(1 VOLT APPLIED TO FORCE+, FORCE2, RTDIN+, RTDIN- PINS)
MAX31865 toc03
TEMPERATURE (°C)
CURRENT (nA)
12510075
20
40
60
80
100
120
140
0
50 150
SUPPLY CURRENT vs. TEMPERATURE
(ADC NORMALLY OFF MODE)
MAX31865 toc02
TEMPERATURE (°C)
I
DD
(mA)
100500
1
2
3
4
0
-50 150
ANALOG I
DD
(BIAS PIN UNLOADED)
DIGITAL I
DD
SUPPLY CURRENT vs. TEMPERATURE
(ADC AUTO CONVERSION MODE)
MAX31865 toc01
TEMPERATURE (°C)
I
DD
(mA)
100500
1
2
3
4
0
-50 150
ANALOG I
DD
(BIAS PIN UNLOADED)
DIGITAL I
DD