REV. A
2
ADM1027SPECIFICATIONS
1, 2, 3, 4 (T
A
= T
MIN
to T
MAX
(0C to 105C), V
CC
= V
MIN
to V
MAX
(3 V to 5.5 V),
unless otherwise noted.)
Parameter
Min
Typ
Max
Unit
Test Conditions/Comments
POWER SUPPLY
Supply Voltage
3.0
3.3
5.5
V
Supply Current, I
CC
1.4
3
mA
Interface Inactive, ADC Active
TEMP-TO-DIGITAL CONVERTER
Local Sensor Accuracy
?
o
C
0
o
C T
A
105
o
C
?
o
C
0
o
C T
A
70
o
C
?
o
C
T
A
= 40
o
C
Resolution
0.25
o
C
Remote Diode Sensor Accuracy
?
o
C
0
o
C T
D
120
o
C
?.5
o
C
0
o
C T
D
120
o
C; 0
o
C T
A
70
o
C
?
o
C
T
A
= 40
o
C
o
C
0
o
C T
D
120
o
C; T
A
= 40
o
C
Resolution
0.25
o
C
Remote Sensor Source Current
200
mA
High Level
12
mA
Low Level
ANALOG-TO-DIGITAL CONVERTER
(INCLUDING MUX AND ATTENUATORS)
Total Unadjusted Error, TUE
?.5
?
%
All ADC Inputs except 12 V
?.5
%
12 V Input
Differential Nonlinearity, DNL
?
LSB
8 Bits
Power Supply Sensitivity
?.1
%/V
Conversion Time (Voltage Input)
11.38
12.29
ms
Averaging Enabled
Conversion Time (Local Temperature)
12.09
13.05
ms
Averaging Enabled
Conversion Time (Remote Temperature)
25.59
27.64
ms
Averaging Enabled
Total Monitoring Cycle Time
120.17
129.78
ms
Averaging Enabled
Total Monitoring Cycle Time
13.51
14.59
ms
Averaging Disabled
Input Resistance
80
140
250
k
FAN RPM-TO-DIGITAL CONVERTER
Accuracy
?
%
0
o
C T
A
70
o
C
?
%
3.0 V V
CC
3.6 V
Full-Scale Count
65,535
Nominal Input RPM
109
RPM
Fan Count = 0xBFFF
329
RPM
Fan Count = 0x3FFF
5,000
RPM
Fan Count = 0x0438
10,000
RPM
Fan Count = 0x021C
Internal Clock Frequency
82.8
90
97.2
kHz
OPEN-DRAIN DIGITAL OUTPUTS,
PWM1PWM3, XTO
Current Sink, I
OL
8.0
mA
Output Low Voltage, V
OL
0.4
V
I
OUT
= 8.0 mA, V
CC
= 3.3 V
High Level Output Current, I
OH
0.1
1
mA
V
OUT
= V
CC
Rev. 3 | Page 2 of 56 | www.onsemi.com
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