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AFE5808: output for LVDS or IQ_bus

Part Number: AFE5808

Hi Ti 

currently our ultrasound asic is development some function, tx/rx is analog zone then signal are differential pair. AFE5808 has 8-ch input and 8-ch LVDS outputs

my question is : i'm not sure LVDS (digital signal) connect to rx of ultrasound asic . because this asic don't accept clk of LVDS. 

also i check the spec, input channels all connect to mixer than go to CW_OUT M/N then use switch to on off each channel. 

so does I/Q_bus (CW_out) connect to RX of ultrasonic asic?  

pls give me a suggestion!

thanks so much!!

  • 您好,方便沟通我们可以直接使用中文讨论。

    : i'm not sure LVDS (digital signal) connect to rx of ultrasound asic . because this asic don't accept clk of LVDS. 

    ASIC的差分输入支持什么电平输入?如果不支持LVDS,那么AFE5808的输出LVDS是不可以直接和RX接的,因为电平幅值和共模电压都不一样。

    also i check the spec, input channels all connect to mixer than go to CW_OUT M/N then use switch to on off each channel. 

    so does I/Q_bus (CW_out) connect to RX of ultrasonic asic?  

    这里是什么意思?CW_out和ASIC的RX接在一起是吗?

  • Hi Kailyn 你好

    沒錯, 我們的芯片RX能接收的訊號頻段在100~1MHz之間, 外在的aculator 頻率在4~7MHz左右, 進入AFE5808 input內, 然後output我打算使用混頻器的CW_IQ_out這一段直接接到我們芯片的RX端

  • 首先CW_out 是summing amplifier的输出端,电压4Vpp,1.5V共模电压,是否能满足RX的电压要求?

    那么关于CW_out是否和RX端连接,抱歉,ASIC的spec我不太熟悉,我认为它应该是和前端的TX连接的。而CW_out外部是要接LPF。或者悬空都是可以的。

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