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low power high speed serialization : 10-bit video camera

Dan Tooth
Mastermind 21335 points
Other Parts Discussed in Thread: SN65LV1224B, SN65LV1023A, TLK1501, SN65LVDS301

Hi

A medical customer has a 2 mega-pizel video camera with 10bit output at 30 frames-per-second. (Output may be 12-bit, but more likely to be 10-bit.)

He needs to serialize this and transmit over either a twisted Copper pair in as low a power way as possible, as his device runs off a LiPoly rechargable. So the receiver power also matters. The communication is one-way, from the camera up the cable to a receiver.

I have had a look at our serializers and power consumed seems high at such a high data-rate. Transmission distance is cm, say 100cm.

Can you suggest what would be our lowest-power method to do this?

  • 0
    TI__Expert 7850 points

    Dan,

     

    Devices to consider are:

     

    SN65LV1023A (TX) and SN65LV1224B(RX) - 10-bit LVDS serializer and de-serializer

    See  http://focus.ti.com/docs/prod/folders/print/sn65lv1023a.html

    In addition you may also want to consider a device like TLK1501 which is a full serdes device.  TLK1501 is a 16 bit serdes device however the customer does not necessarily need to use all 16 bits. The TLK1501 has a pin that enables transmit-only.  This pin  is called LCKREFN that disables the receiver.   This pin also disables the internal link initialization state machine so the the TX isn't always trying to send IDLE because there is not valid serial input.
    There is no corresponding receive-only mode, one would just have to ignore the TX serial outputs.  Maybe use RREF to make the output swing as small as possible. 
    The other item to consider when using a device like TLK1501 is that inserting periodic IDLE patterns is a good idea, the TLK1501 does not do that on its own.  The TX_EN and TX_ER pins would have to be controlled to periodically insert the IDLE pattern.

    Product folder: http://focus.ti.com/docs/prod/folders/print/tlk1501.html

    We also have flight link3G device that may be suitable from an interface perspective but they may not have the drive strength for a 40 inch cable but they are lower in power.

    Product folder for FlatLink3G devices: http://focus.ti.com/docs/prod/folders/print/sn65lvds301.html

    -Atul

     

     

  • 0 in reply to Atul Patel
    TI__Mastermind 21335 points

    Hi Atul

    Thanks for the quick reply.

    I was wrong about the distance. In fact customer needs to tx only over a 10cm distance.

    This makes the Flatlink solution interesting due to low power consumption.

    Is the LVDS301 able to do that distance?

  • 0
    TI__Expert 7850 points

     

    Dan,

     

    LVDS301 should certainly be able to drive ~4 inches = ~10cm.

    See pages 24 and 25 of the datasheet where we have eye-patterns after 80 inches or ~2m

     

    -Atul