AD9121 datasheet(52/61 Pages) AD

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Data Sheet

AD9121

Rev. B | Page 51 of 60

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fDAC (MHz)

Figure 78. DVDD18 Power Dissipation vs. f

DAC Due to Inverse Sinc Filter

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fDATA (MHz)

1× INTERPOLATION

2×, 4×, 8× INTERPOLATION

Figure 79. DVDD18 Power Dissipation vs. f

DATA Due to Fine NCO

TEMPERATURE SENSOR

The AD9121 has a band gap temperature sensor for monitoring

the temperature change of the AD9121. The temperature must

be calibrated against a known temperature to remove the part-

to-part variation on the band gap circuit used to sense the

temperature. The DACCLK must be running at a minimum

of 100 MHz to obtain a reliable temperature measurement.

To monitor temperature change, the user must take a reading

at a known ambient temperature for a single-point calibration

of each AD9121 device.

Tx = TREF + 7.7 × (Code_x − Code_ref)/1000 + 1

where:

Code_x is the readback code at the unknown temperature, Tx.

Code_ref is the readback code at the calibrated temperature, TREF.

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

ings, the die temperature range control register (Register 0x48)

should be set to 0x02.

AD9121 Datasheet(PDF) 52 Page - Analog Devices

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