AD9122 datasheet(49/56 Pages) AD

49 / 56 page

AD9122

Rev. 0 | Page 49 of 56

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fDAC (MHz)

Figure 77. DVDD18 Power Dissipation vs. fDAC Due to Inverse Sinc Filter

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fDATA (MHz)

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Figure 78. DVDD18 Power Dissipation vs. fDATA Due to Fine NCO

TEMPERATURE SENSOR

The AD9122 has a diode-based temperature sensor for measuring

the temperature of the die. The temperature reading is accessed

through Register 0x49 and Register 0x4A. The temperature of

the die can be calculated by

)

925

]

[

(

−

= DieTemp

DIE

where TDIE is the die temperature in oC. The temperature

accuracy is ±5oC typical.

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 50oC,

then the ambient temperature can be calculated as

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

where:

TA is the ambient temperature in oC.

TJA is the thermal resistance from junction to ambient of the

AD9122, as shown in Table 7.

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

the range control register (Register 0x48) should be set to 0x02.

AD9122 Datasheet(PDF) 49 Page - Analog Devices

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