MAX31865
RTD-to-Digital Converter
Typical Operating Characteristics
(V
= V
= 3.3V, T = +25°C, unless otherwise noted.)
DD
DVDD A
SUPPLY CURRENT vs. TEMPERATURE
SUPPLY CURRENT vs. TEMPERATURE
(ADC AUTO CONVERSION MODE)
(ADC NORMALLY OFF MODE)
4
4
3
3
ANALOG I
DD
(BIAS PIN UNLOADED)
ANALOG I
(BIAS PIN UNLOADED)
DD
2
1
0
2
1
0
DIGITAL I
DIGITAL I
DD
DD
-50
0
50
100
150
-50
0
50
100
150
TEMPERATURE (°C)
TEMPERATURE (°C)
LEAKAGE CURRENT PER PIN vs. TEMPERATURE
(1 VOLT APPLIED TO FORCE+, FORCE2, RTDIN+, RTDIN- PINS)
SINC FILTER OPERATION
INPUT FREQUENCY vs. NOISE RESPONSE
20
0
140
120
100
80
-20
-40
-60
-80
-100
50Hz
60Hz
60
40
20
0
50
75
100
125
150
10
50
90
130
170
TEMPERATURE (°C)
INPUT NOISE FREQUENCY (Hz)
ADC CONVERSION ERROR vs. RTD RESISTANCE
(4kΩ R , 4-WIRE CONNECTION)
ADC CONVERSION ERROR vs. RTD RESISTANCE
(400Ω R , 4-WIRE CONNECTION)
REF
REF
MAX31865 toc05
MAX31865 toc06
0.488
0.244
0
0.488
0.244
0
-40°C
+25°C
+25°C
-40°C
0.1ꢀ°
ERROR
0.1ꢀ°
ERROR
˜
˜
+100°C
+100°C
-0.244
-0.488
-0.244
-0.488
0
500 1000 1500 2000 2500 3000 3500
(Ω)
0
50 100 150 200 250 300 350
R
R
(Ω)
RTD
RTD
Maxim Integrated
6
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
