AD9148BPCZ AD [Analog Devices], AD9148BPCZ Datasheet - Page 65

• Manufacturer Part Number: AD9148BPCZ
• Description: Quad 16-Bit,1 GSPS, TxDAC+ Digital-to-Analog Converter
• Manufacturer: AD [Analog Devices]

Preliminary Technical Data
TEMPERATURE SENSOR
The AD9148 has a diode-based temperature sensor for measuring
the temperature of the die. The temperature reading is accessed
by Register 0x5E and Register 0x5F. The temperature of the die
can be calculated as
where T
temperature accuracy is ±5°C typical over TBD range.
Estimates of the ambient temperature can be made if the power
dissipation of the device is known. For example, if the device power
dissipation is 800 mW and the measured die temperature is 50°C,
then the ambient temperature can be calculated as
T
DIE
DIE
=
is the die temperature in degrees Celsius. The
(
DieTemp
126
[
15
:
9 .
] 0
−
46875
)
Rev. PrA | Page 65 of 73
where:
T
T
AD9148 as shown in Table 7.
To use the temperature sensor, it must be enabled by setting
Bit 0, Register 0x5C to 0. Before the temperature sensor data can
be readback, it must be latched by toggling Bit 1, Register 0x5C
from 0 to 1. In addition, to get accurate readings, the range
control register (Register 0x5D) should be set to 0x02.
A
JA
is the ambient temperature in degrees Celsius.
is the thermal resistance from junction to ambient of the
T
A
= T
DIE
– P
D
× T
JA
= 50 – 0.8 × 19.1 = 34.7°C
AD9148