AFE5809: AFE5809 C-bypass on INM pins Question.
Part Number: AFE5809
For AFE5809, DVDD_LDO 1/2, it is digital power for modulator. It can be internally generated. also , external higher performance 1.4-V supply can be applied to N4 and N6 for minimizing digital noise emission.
What is the requirement for this power supply if we use external spply? Such as, current it consumes, noise requirement, and so on?
In reply to Chen Kung:
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Hi Chen, Thanks for you patient answer !
We will follow the spec and seperate DVDD_LDO1/2 on PCB.
I noticed that on page 15-16 of datadsheet, when demodulator is enabled, the additional power consumption is typ.90mW/CH on the basis of max. 190mW/CH. That is 50% increasement.
For 16pcs AFE5809 for our system, no matter internall or external power supply for demodulators, the additional current on D1V8 or on DVDD_LDO1/2 should be :
90mW/CH * 128Channel* 130%(margin) / 1.8V = 8320mA. This is a big increase on current. And I think we have to change our power tree structure.
In reply to yi xiao:
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