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LM96570 in multichannel application

Mariusz Hajduk1
Intellectual 710 points
Other Parts Discussed in Thread: LM96570

Hi all,

In the LM96570 datasheet there is an information that the output propagation delay(Tod) is between 32 and 47.5ns (table on page 6).

Therefore, the [total delay]=[output propagation delay] + [programmed delay]  (DELAY ADJUSTMENT on page 11). How can I properly use this chips in multichannel application as the exact output propagation delay between 2 or more chips is unknown?

Mariusz

  • 0

    Hi Mariusz,

    TOD in the data sheet  is chip-to-chip variation spec. in a multi-chip system.  For a single-chip application, all channels have same TOD for beam forming.

    Regards,

    HK

     

  • 0 in reply to Hon Kin Chiu
    Intellectual 710 points

    Hon Kin Chiu said:

    TOD in the data sheet  is chip-to-chip variation spec. in a multi-chip system.  For a single-chip application, all channels have same TOD for beam forming.

    Hello Hon,

    Single-chip application is not a problem, however, 8-channel only ultrasound scanner will be a poor quality. The minimum #of channels should be at least 32, so it requires 4 chips. As TOD is different and unknown for every chip, then it's not possible to use them as a precise beamformer. Within a single chip we have a nice resolution 0.78ns and on the other hand we loose the beamforming precision up to 15.5ns(TOD variance) when using more chips. I'm affraid it makes this device unusable for targeted applications.

    Regards,

    Mariusz