AD9747-EBZ datasheet(26/28 Pages) AD

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AD9741/AD9743/AD9745/AD9746/AD9747

Rev. 0 | Page 26 of 28

100

150

200

250

fDAC (MHz)

125

175

225

AD9747

AD9741

Figure 43 shows the power consumption for each power supply

domain as well as the total power consumption. Individual bars

within each group display the power in full active mode (blue)

vs. power for five increasing levels of power-down.

100

150

200

250

300

350

AVDD33

DVDD18

CVDD18

DVDD33

TOT PWR

FULL ACTIVE

DCO OFF

AUX OFF

DAC OFF

CLK OFF

BIAS OFF

Figure 41. DVDD18 Current vs. fDAC

100

150

200

250

fDAC (MHz)

125

175

225

Figure 43. Power Dissipation vs. Power-Down Mode

The overall power consumption is dominated by AVDD33 and

significant power savings can be achieved simply by disabling

the DAC outputs. Also, disabling the DAC outputs is a signifi-

cant way to conserve power and still maintain a fast wake-up

time. Full power-down disables all circuitry for minimum

power consumption. Note, however, that even in full power-

down, there is a small power draw (25 mW) due to incoming

data activity. To lower power consumption to near zero, all

incoming data activity must be halted.

Figure 42. CVDD18 Current vs. fDAC

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