Typical operating characteristics (continued) – Rainbow Electronics MAX6678 User Manual
Page 4
MAX6678
2-Channel Temperature Monitor with Dual Automatic
PWM Fan-Speed Controller and Five GPIOs
4
_______________________________________________________________________________________
Typical Operating Characteristics (continued)
(T
A
= +25°C, unless otherwise noted.)
-3
-1
-2
1
0
2
3
0
50
25
75
100
125
LOCAL TEMPERATURE ERROR
vs. DIE TEMPERATURE
MAX6678 toc04
TEMPERATURE (°C)
TEMPERATURE ERROR (
°
C)
-1.5
0
-0.5
-1.0
1.0
0.5
1.5
2.0
0.01
1
0.1
10
100
1000
REMOTE TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6678 toc05
FREQUENCY (kHz)
TEMPERATURE ERROR (
°
C)
V
IN
= 250mV
P-P
SQUARE WAVE APPLIED
TO
V
CC
WITH NO BYPASS CAPACITOR
-2.5
-1.0
-1.5
-2.0
0
-0.5
0.5
1.0
0.01
1
0.1
10
100
1000
LOCAL TEMPERATURE ERROR
vs. POWER-SUPPLY NOISE FREQUENCY
MAX6678 toc06
FREQUENCY (kHz)
TEMPERATURE ERROR (
°
C)
V
IN
= 250mV
P-P
SQUARE WAVE APPLIED
TO
V
CC
WITH NO BYPASS CAPACITOR
0
1.4
1.2
1.0
0.8
0.6
0.4
0.2
1.8
1.6
2.0
0.01
1
0.1
10
100
1000
REMOTE TEMPERATURE ERROR
vs. COMMON-MODE NOISE FREQUENCY
MAX6678 toc07
FREQUENCY (kHz)
TEMPERATURE ERROR (
°
C)
V
IN
= AC-COUPLED TO DXP AND DXN
V
IN
= 100mV
P-P
SQUARE WAVE
0
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.9
0.8
1.0
0.01
1
0.1
10
100
1000
REMOTE TEMPERATURE ERROR
vs. DIFFERENTIAL NOISE FREQUENCY
MAX6678 toc08
FREQUENCY (kHz)
TEMPERATURE ERROR (
°
C)
V
IN
= AC-COUPLED TO DXP
V
IN
= 100mV
P-P
SQUARE WAVE
-6
-3
-5
-4
-1
-2
1
0
2
0.1
1
10
100
TEMPERATURE ERROR
vs. DXP-DXN CAPACITANCE
MAX6678 toc09
DXP-DXN CAPACITANCE (nF)
TEMPERATURE ERROR (
°
C)
T
A
= +25°C
30
31
33
32
34
35
-40
10
35
-15
60
110
85
PWMOUT FREQUENCY
vs. DIE TEMPERATURE
MAX6678 toc10
TEMPERATURE (°C)
PWMOUT FREQUENCY (Hz)
30
31
33
32
34
35
3.0
4.0
3.5
4.5
5.0
5.5
PWMOUT FREQUENCY
vs. SUPPLY VOLTAGE
MAX6678 toc11
SUPPLY VOLTAGE (V)
PWMOUT FREQUENCY (Hz)
0
100
300
200
400
500
0
10
15
5
20
25
30
35
40
GPIO OUTPUT VOLTAGE
vs. GPIO SINK CURRENT
MAX6678 toc12
GPIO SINK CURRENT (mA)
GPIO OUTPUT VOLTAGE (mV)