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Part Number: AFE5803
Our customer is using the AFE5803 for an application and wants to optimize the power consumption. He know that he can turn-off unused channels by setting register functions. However, since he is using averaging feature (AVERAGING_ENABLE), he does not know which channels he can safely turn-off.
He have inputs coming in on channels 3 + 4 (which comes out on channel 4), and another pair of inputs coming in on channels 5 + 6 (which comes out on channel 5). Does this mean that he can turn off all but channels 4 and 5? Does that apply for both the ADC and VCA power-down, as well as the LVDS signaling power-down? Or do he need to leave channels 3-6 on for the ADC and VCA, since those channels are receiving inputs?
Thanks in advance!
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In reply to Chen Kung:
Thank you for looking into this!
For your question about AFE5803 device.
AFE5803 Channels power
CH3~6 need to be active. Otherwise average doesn’t work.
Thank you for the response.Just to confirm, if our customer are using averaging on channels 3 and 4, then channels 3 through 6 need to be configured as active. Does that apply to all of the registers (ADC_PDN_CH<7:0>, POWER_DOWN_LVDS_CH<7:0>, and PDN_CH<7:0>)?
In reply to Art Mecina:
Any update on this follow-up inquiry?
Just like to follow-up on this one.
Clearly for one example only is:
if the customer wants to do averaging on channel 3 and channel 4,
ADC_PDN_CH3=0, and ADC_PDN_CH4=0
PDN_CH3=0, and PDN_CH4=0
others can be added if neeced.
Our customer have a follow-up inquiry on this one. He has some clarifications. According to him, if channels 3+4 are being averaged together, he should power down LVDS for channel 3, leaving channel 4 powered on. He done exactly that but it does not work.
What he's actually doing is averaging on channels 3+4 and also channels 5+6. He is expecting therefore, that he could power down channels 3 and 5, leaving channels 4 and 6 powered on. However, this doesn't work. Instead he need to power down channels 3 and 6, leaving channels 4 and 5 powered on. He find it to be a discrepancy.
I will refer the customer directly to this post. It would be best if he can communicate directly his scenario.
Thanks for the assistance!
Please refer to AFE5803 datasheet page 26,
when using Averaging mode (AVERAGING_ENABLE=1)
Ch1 and Ch2 Averaging to Channel 3 LVDS output pins
Ch3 and Ch4 Averaging to Channel 4 LVDS output pins
Ch5 and Ch6 Averaging to Channel 5 LVDS output pins
Ch7 and Ch8 Averaging to Channel 6 LVDS output pins
If in the case above, then
then you can turn off
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