ADT7490ARQZ-REEL 查看數據表（PDF） - Analog Devices
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ADT7490ARQZ-REEL Datasheet PDF : 76 Pages
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ADT7490
SPECIFICATIONS
TA = TMIN to TMAX, VCC = VMIN to VMAX, unless otherwise noted. All voltages are measured with respect to GND, unless otherwise specified.
Typical voltages are TA = 25°C and represent a parametric norm. Logic inputs accept input high voltages up to VMAX, even when the device
is operating down to VMIN. Timing specifications are tested at logic levels of VIL = 0.8 V for a falling edge, and VIH = 2.0 V for a rising edge.
Table 1.
Parameter
Min
Typ Max
Unit
Test Conditions/Comments
POWER SUPPLY
Supply Voltage
3.0
3.3
3.6
V
Supply Current, ICC
1.5
5
mA
Interface inactive, ADC active
TEMPERATURE-TO-DIGITAL CONVERTER
Local Sensor Accuracy
±0.5 ±1.5
°C
0°C ≤ TA ≤ 85°C
±2.5
°C
−40°C ≤ TA ≤ +125°C
Resolution
0.25
°C
Remote Diode Sensor Accuracy
±0.5 ±1.5
°C
0°C ≤ TA ≤ 85°C
±2.5
°C
−40°C ≤ TA ≤ +125°C
Resolution
0.25
°C
Remote Sensor Source Current
12
μA
Low level
72
μA
Mid level
192
μΑ
High level
Series Resistance Cancellation1
1.5
kΩ
The ADT7490 cancels up to 2 kΩ in series
with the remote thermal sensor
ANALOG-TO-DIGITAL CONVERTER
(INCLUDING MUX AND ATTENTUATORS)
Total Unadjusted Error (TUE)
±2
%
For all channels: −40°C ≤ TA ≤ +125°C
±1.5
%
For all other channels except +12VIN:
0°C ≤ TA ≤ +125°C
Differential Nonlinearity (DNL)
±1
LSB
8 bits
Power Supply Sensitivity
±0.1
%/V
Conversion Times1
Voltage Inputs
VTT Voltage Input2
11
13
12
14
ms
Averaging enabled, all channels excluding VTT2
ms
Averaging enabled
Local Temperature
12
14
ms
Averaging enabled
Remote Temperature
38
43
ms
Averaging enabled
Total Monitoring Cycle Time
169 193
ms
Averaging enabled
19
ms
Averaging disabled
Input Resistance
150
200
kΩ
For +12VIN channel
70
100
kΩ
For all other channels
FAN RPM-TO-DIGITAL CONVERTER
Accuracy
±10
%
0°C ≤ TA ≤ 85°C
±14
%
−40°C ≤ TA ≤ +125°C
Full-Scale Count
65,535
Nominal Input RPM
109
RPM
Fan count = 0xBFFF
329
RPM
Fan count = 0x3FFF
5000
RPM
Fan count = 0x0438
10,000
RPM
Fan count = 0x021C
OPEN-DRAIN DIGITAL OUTPUTS,
PWM1 TO PWM3, XTO
Current Sink, IOL
8.0
mA
Output Low Voltage, VOL
0.4
V
IOUT = −8.0 mA
High Level Output Current, IOH
0.1
20
μA
VOUT = VCC
Rev. 0 | Page 4 of 76
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