ADT75ARZ Analog Devices Inc, ADT75ARZ Datasheet - Page 22

• Manufacturer Part Number: ADT75ARZ
• Description: IC SENSOR TEMP 12BIT DGTL 8SOIC
• Manufacturer: Analog Devices Inc

Specifications of ADT75ARZ

• Function: Temp Monitoring System (Sensor)
• Topology: ADC (Sigma Delta), Comparator, Register Bank
• Sensor Type: Internal
• Sensing Temperature: -55°C ~ 125°C
• Output Type: I²C™/SMBus™
• Output Alarm: No
• Output Fan: No
• Voltage - Supply: 3 V ~ 5.5 V
• Operating Temperature: -55°C ~ 125°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Ic Output Type: Digital
• Sensing Accuracy Range: ± 2°C
• Supply Current: 200µA
• Supply Voltage Range: 3V To 5.5V
• Resolution (bits): 12bit
• Sensor Case Style: SOIC
• No. Of Pins: 8
• Msl: MSL 3 - 168 Hours
• Temperature Sensing Range: -55°C To +125°C
• Rohs Compliant: Yes
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

ADT75
TEMPERATURE MONITORING
The ADT75 is ideal for monitoring the thermal environment
within electronic equipment. For example, the surface-mounted
package accurately reflects the exact thermal conditions that
affect nearby integrated circuits.
The ADT75 measures and converts the temperature at the
surface of its own semiconductor chip. When the ADT75 is
used to measure the temperature of a nearby heat source, the
thermal impedance between the heat source and the ADT75
must be considered. Often, a thermocouple or other
temperature sensor is used to measure the temperature of the
source, while the temperature is monitored by reading back
from the ADT75 temperature value register.
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Once the thermal impedance is determined, the temperature of
the heat source can be inferred from the ADT75 output. As
much as 60% of the heat transferred from the heat source to the
thermal sensor on the ADT75 die is discharged via the copper
tracks, the package pins, and the bond pads. Of the pins on the
ADT75, the GND pin transfers most of the heat. Therefore, to
measure the temperature of a heat source it is recommended
that the thermal resistance between the ADT75 GND pin and
the GND of the heat source is reduced as much as possible.
For example, use the ADT75’s unique properties to monitor a
high-power dissipation microprocessor. The ADT75 device, in a
surface-mounted package, is mounted directly beneath the
microprocessor’s pin grid array (PGA) package. The ADT75
produces a linear temperature output while needing only two
I/O pins and requiring no external characterization.