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AD9154-EBZ bảng dữ liệu(PDF) 77 Page - Analog Devices

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AD9154-EBZ bảng dữ liệu(HTML) 77 Page - Analog Devices

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Data Sheet
AD9154
Rev. C | Page 77 of 124
TEMPERATURE SENSOR
The AD9154 has a band gap temperature sensor for monitoring
junction temperature changes on the AD9154 die. The temperature
must be calibrated against a known temperature to remove the
device-to-device variation in the band gap circuit that senses
the temperature.
To monitor temperature change, the user must take a reading at
a known ambient temperature for a single-point calibration of
each AD9154 device.
Tx = TREF + 7.3 × (CODE_X − CODE_REF)/1000
where:
CODE_X is the DIE_TEMP readback code from Register 0x132
and Register 0x133 at the unknown temperature, Tx.
CODE_REF is the DIE_TEMP readback from the same addresses
at the calibrated temperature, TREF.
To use the temperature sensor, it must be enabled by setting
Register 0x12F, Bit 0, to 1. The user must write a 1 to
Register 0x134, Bit 0 before reading back the die temperature
from Register 0x132 and Register 0x133.



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