Hello
I want to design a Doppler circuit with two AFE5809s, and use 16 piezo elements to realize a Doppler measurement. The analogue to numerical conversion, is realize with an ADS8472 like the AFE5809 datasheet proposed (‘’CW Supporting Circuits’’ section). In attachment, you can find my proposed circuit (multiple AFE in application note).With this circuit; I have a couple of question.
1 : Can you say me if my proposed circuit is good? And if is not can you give me the good one?
2 : If my circuit is ok, What is the routing constraints of the differentials pairs? Does the diff pairs of CW_IPAFE1_OUTM, CW_IPAFE1_OUTP, CW_IPAFE2_OUTM, CW_IPAFE2_OUTP, CW_QPAFE1_OUTM, CW_QPAFE1_OUTP, CW_QPAFE2_OUTM and CW_QPAFE2_OUTM must have the same lengths?
Finally, we have pay the AFE5809 dev board, can you say me if can i have the Gerber file or eventually the Altium, Cadence files...of this AFE5809 dev board? Can you send me one of them?
Best regards
Sam
Sam,
Your configuration is correct for the CW Voltage Output mode (Figure 103). Also, see the Design database for the AFE5809 EVM here:
https://txn.box.com/s/7exnwc5h9jf12cr49ojc2evpegzu5nda
Do you still need the Gerbers?
Thanks,
Chuck
Chuck Smyth, Applications Engineering, HealthTech-Imaging
Please verify post if question is answered.
In reply to csmyth:
Hi ChuckThanks a lot.Yes i want the GERBER file (i can read it without difficulty).For the Design database (AFE5809 EVM), can you say me what software can i use to read it.Best regardsSam
In reply to Samm:
Hi Chuck
Thanks for the Gerbers file
Hi Chuck,In attachment, you can find my final design. Before routing it, i want to confirm with you my design.
For the values of R5,11,16,18,25,31,36 and finally R38, i chose these values equal to 499 Ohms. Does these values are good?
Finally, on the ti website, i find the AFE5816. Can you say me more about it the price, datasheet, and eventually dev board.
Thanks
Please see the attachment for the CW Mixer Out external amplifier reference. I recommend an external amp, but I have not tried going straight into the ADC. In this case, I believe the 500 ohm might be unnecessary.
CW Mixer Out from AFE5809_EVM_RevA_Sch.pdf
Dear Sam,
Can you please provide me detailed datasheet for AFE5816 under NDA condition. I can email details about my application
Best regards,
Vassili
vi@pst-inc.com
http://www.pst-inc.com/
Vassili Ivanov, PhDSystem Architect / CTO / co-founderPhotoSound Technologies, Inc
In reply to Vassili Ivanov40:
Done.