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AFE5808: output for LVDS or IQ_bus

win hsu
Prodigy 10 points
Part Number: AFE5808
Other Parts Discussed in Thread: 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!!

  • 0
    TI__Guru**** 295050 points

    您好，方便沟通我们可以直接使用中文讨论。

    win hsu 说：
    : 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。

    win hsu 说：

    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？

  • 0 回复 Kailyn Chen
    Prodigy 10 points

    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

  • 0 回复 win hsu
    TI__Guru**** 295050 points

    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。