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AD9154 Datasheet(PDF) 77 Page - Analog Devices |
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AD9154 Datasheet(HTML) 77 Page - Analog Devices |
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77 / 124 page  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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