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Analog multiplexing and demultiplexing

Max Cd
Prodigy 20 points
Other Parts Discussed in Thread: SN65HVD102, SN65HVD101, TLK3134

Dear all

I have 4 analog signals (0-2 Vpp range) coming from 4 Ultrasonic transducers with a frequency of 5 MHz each .  I would like to multiplex them and send through a single line (1 meter length) .

At the end I'll have to demultiplex the Mux channels into the original 4 signals . Going to the TI selection of

MUX/DEMUX I can't find the right combination of 2 . Is that anything somebody already faced ? Any advise ?

And what if I would like to Mux and Demux 8 analog signals (same frequency BW)  instead of 4 ?

 I mean Time division mux but other alternatives could be acceptable.

Thanks to all

Max

  • 0
    TI__Expert 6395 points

    Hello Max,

    I'm afraid I don't quite understand the application. Do you have a block diagram of what you are trying to accomplish and can you give the part numbers of the parts you are considering to help you accomplish this task?

    Regards,
    Andrew

  • 0
    Expert 2585 points

    Hi Max,

    I guess you talk   about Serializer,Deserializerl - something like SN65HVS88x. But unfortunately they use SPI to transmit signal and there is no possibility to send data in this case through one wire.

    Another solution for  you  could be something like IO interface  SN65HVD101 or SN65HVD102.

  • 0 in reply to Oleksiy Pazyuk
    Prodigy 20 points

    Hi Oleksiy

    the application has been changed just after I posted it. Anyway this is shortly the application :

    a)I have 4 ultrasonic transducers (called piezo elements) , which generate and analog signal 1 Vpp max. All 4 ultrasonic transducers receive vibration and generate an analog signal which depends on sound pressure on the pezo element.in short have 4 analog signals with frequency of 5 Mhz  but with variable amplitude.

    b)I need to transfer such 4 signal thorugh 2 lines only (serial, high speed differential like DP/DN).

    c)What I would think to use is a SERDES like the TLK 3134 and 4 A/D converters 8bit and 50 MSPS rate. The 4 AD converters will take the Ultrasonic analog signal  and convert to 8 bit  at 50 MSPS synchronized .The the word of 4 x 8 bits from the 4 x ADC will be sent  to the TLK3134 32 bit input digital  port (ADC1 port 0:7 -ADC2 8:15 -ADC3 16:23 - ADC4 24:31)

    d)The TLK 3134 will generate a serial data stream (DP-DN) of  approx. 1.6 - 2 Ghz which could be sent on a 2 wire line to the 2nd SERDES  , another TLK3134 which will serve as de-serializer , returning the 32 bit word at a rate of 50 MHz. At this point 4 x DAC will return the original analog signals.

    The purpose is to transfer  4 analog signals into a 2 wire line. The best would be to transfer 8 analog channels into 2 wire line with Serdes but I couldn't find a 64 bit digital input SERDES at this moment

    Thanks for your help.

    Max