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TLV320AIC3254: where can I buy the FE board in Stethoscope MDK application note

Part Number: TLV320AIC3254

hello,

I am trying to run the demo application of document called ' Digital Stethoscope Implementation on the TMS320C5515 DSP Medical Development Kit (MDK)' on EVM5515 board. The link of this document is http://www.ti.com.cn/cn/lit/an/sprab38a/sprab38a.pdf . In the document, the FE board is AIC3504. I cannot find any place to buy this board. Please help.