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Power consumption of AD9788.

Question asked by JeonKihyeon on Mar 21, 2013
Latest reply on Mar 27, 2013 by JeonKihyeon

Hi .

 

I wonder the power consumption of AD9788.

Show the power consumption in AD9788 datasheet.

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DC SPECIFICATIONS

 

POWER CONSUMPTION

1× Mode, fDATA = 100 MSPS, PLL Off, IF = 2 MHz                          375          450          mW

2× Mode, fDATA = 100 MSPS, Inverse Sinc Off, PLL Off                  533                          mW

4× Mode, fDATA = 100 MSPS, Inverse Sinc Off, PLL Off                  754                          mW

8× Mode, fDATA = 100 MSPS, Inverse Sinc Off, PLL Off                1054                          mW

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(in datasheet)

 

My system main power is 5voltage. So if DC SPECIFICATIONS is correctly, maximum consumption current is 210mA.

But actual maximum consumption current is more than 210mA.


Current measure condition is below.

Only 1 dac operating and 8x interpolation, default scale setting, and default gain, signal is not output..

then the current consumption is 680mA.


Another case is below.

Only 1 dac operating and 8x interpolation, default scale setting, and default gain, signal is output.

then the current consumption is 1084mA.


I just don't understand.

My calculate is incorrectly?

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