AD9142ABCPZRL datasheet(42/73 Pages) AD

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Data Sheet

AD9142A

TEMPERATURE SENSOR

The AD9142A 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 code

readback vs. die temperature is shown in Figure 52.

Figure 52. Die Temperature Code Readback vs. Die Temperature

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.

TDIE is the die temperature in degrees Celsius.

PD is power consumption of the device.

θJA is the thermal resistance from junction to ambient of the

AD9142A as shown in Table 8.

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

set the die temperature control register (Register 0x1C) to 0x03.

–40 –30 –20 –10

TEMPERATURE (°C)

35000

37000

39000

41000

43000

45000

47000

49000

51000

Rev. A | Page 41 of 72

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