AD9142BCPZ datasheet(35/65 Pages) AD

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Data Sheet

AD9142

Rev. 0 | Page 35 of 64

TEMPERATURE SENSOR

The AD9142 has a diode-based temperature sensor for measuring

the temperature of the die. The temperature reading is accessed

using Register 0x1D and Register 0x1E. The temperature of the

die can be calculated as

106

)

237

]

[

(

−

DieTemp

DIE

where TDIE is the die temperature in degrees Celsius. The

temperature accuracy is ±7°C typical over the +85°C to −40°C

range with one point temperature calibration against a known

temperature. A typical plot of the die temperature vs. die

temperature code readback is shown in Figure 50.

Figure 50. Die Temperature vs. Die Temperature Code Readback

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

TA = TDIE – PD × θJA = 50 – 0.8 × 20.7 = 33.4°C

where:

TA is the ambient temperature in degrees Celsius.

θJA is the thermal resistance from junction to ambient of the

AD9142 as shown in Table 8.

To use the temperature sensor, it must be enabled by setting Bit 0,

temperature control register (Register 0x1C) should be set to 0x03.

–40 –30 –20 –10

TEMPERATURE (°C)

35000

37000

39000

41000

43000

45000

47000

49000

51000

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