AD9136-EBZ datasheet(78/117 Pages) AD

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AD9135/AD9136

Data Sheet

Rev. C | Page 78 of 117

DEVICE POWER DISSIPATION

The AD9135/AD9136 have eight supply rails, AVDD33,

DVDD12, SVDD12, SIOVDD33, CVDD12, IOVDD, VTT, and

PVDD12, which can be driven from five regulators to achieve

optimum performance, as shown in Figure 67.

The AVDD33 supply powers the DAC core circuitry. The power

dissipation of the AVDD33 supply rail is independent of the

digital operating mode and sample rate. The current drawn

from the AVDD33 supply rail is typically 68 mA (225 mW)

when the full-scale current of DAC0 and DAC1 are set to the

nominal value of 20.48 mA.

PVDD12 powers the DAC PLLs and varies depending on the

DAC sample rate. CVDD12 can be combined with the PVDD12

regulator, but requires proper bypass capacitor networks near

the pins. CVDD12 powers the clock tree, and the current varies

directly with the DAC sample rate. DVDD12 powers the DSP

core, and the current draw depends on the number of DSP

functions and the DAC sample rate used. SVDD12 supplies the

SERDES lanes and associated circuitry including the equalizers,

SERDES PLL, PHY, and up to the input of the DSP. The current

depends on the number lanes and the lane bit rate. IOVDD

powers the SPI circuit and draws a very small current.

SIOVDD33 powers the equalizers for the SERDES lanes. The

VTT termination voltage draws a very small current of <5 mA.

TEMPERATURE SENSOR

The AD9135/AD9136 have a band gap temperature sensor for

monitoring the temperature changes of the AD9135/AD9136.

The temperature must be calibrated against a known temperature

to remove the device-to-device variation on the band gap circuit

used to sense the temperature.

To monitor temperature change, the user must take a reading at

a known ambient temperature for a single-point calibration of

each AD9135/AD9136 device.

Tx = TREF + 7.3 × (CODE_X − CODE_REF)/1000

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

before reading back the die temperature from Register 0x132

and Register 0x133.

AD9136-EBZ Datasheet(PDF) 78 Page - Analog Devices

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