User Manual

MAX6646/MAX6647/MAX6649
+145°C Precision SMBus-Compatible Remote/
Local Sensors with Overtemperature Alarms
4 _______________________________________________________________________________________
Typical Operating Characteristics
(V
CC
= 3.3V, T
A
= +25°C, unless otherwise noted.)
MAX6649 toc01
SUPPLY VOLTAGE (V)
STANDBY SUPPLY CURRENT (µA)
5.04.54.03.5
3.0
3.5
4.0
4.5
5.0
2.5
3.0 5.5
STANDBY SUPPLY CURRENT
vs. SUPPLY VOLTAGE
MAX6649 toc02
CONVERSION RATE (Hz)
OPERATING SUPPLY CURRENT (µA)
4.002.001.000.500.250.13
100
200
300
400
0
0.63
OPERATING SUPPLY CURRENT
vs. CONVERSION RATE
MAX6649 toc03
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
125100755025
-1.5
-0.5
0
0.5
1.0
1.5
2.0
-2.0
0
REMOTE TEMPERATURE ERROR
vs. REMOTE-DIODE TEMPERATURE
-1.0
T
A
= +85
°
C
FAIRCHILD 2N3906
MAX6649 toc04
TEMPERATURE (°C)
TEMPERATURE ERROR (°C)
100755025
-1.5
-1.0
-0.5
0
0.5
1.0
-2.0
0 125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6649 toc05
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
10k1k100101
-1
0
1
2
3
4
5
-2
0.1 100k
V
CC
= SQUARE WAVE APPLIED TO
V
CC
WITH NO BYPASS CAPACITOR
LOCAL ERROR
TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
REMOTE ERROR
MAX6649 toc06
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
10k1k10010
-1
0
1
2
3
4
5
6
7
8
9
-2
1 100k
LOCAL TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
LOCAL ERROR
REMOTE ERROR
V
IN
= AC-COUPLED TO DXN
V
IN
= 100mV
P-P
MAX6649 toc07
FREQUENCY (Hz)
TEMPERATURE ERROR (°C)
10k1k10010
-0.5
0
0.5
1.0
1.5
2.0
-1.0
1 100k
TEMPERATURE ERROR
vs. DIFFERENTIAL-MODE NOISE FREQUENCY
MAX6649 toc08
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (°C)
10.0001.000
-4
-3
-2
-1
0
1
-5
0.100 100.000
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCE