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ADS5292 max. sample rate using the 1-wire LVDS interface

Niels Koll
Expert 1950 points
Other Parts Discussed in Thread: ADS5292, ADS5296A, ADS5294, ADS5295, ADS52J90

Hello,

I need some clarification the max. sample rate of the ADS5292 when using its 1-wire LVDS interface. On page 6, the Data Sheet states:

"Maximum data rate, 1-wire interface 960 MSPS" (MSPS should be Mbps I assume)

When I divide 960Mbps by 12bit (the ADC resolution), I get a max. sample frequency of 80Msps.

But Table 2 on page 11 stops at 65MSPS for the 1-wire LVDS interface.


So what is the max. sample rate of the ADS5292 when it is used with the 1-wire LVDS interface?

I am looking forward to your answers.


King regards,

Niels

  • 0
    TI__Genius 14540 points

    Hi Niels,

    Your observations are absolutely correct-there are discrepancies in this datasheet which we will try to eliminate in the next release.  For clarification, 

    • "960 MSPS" should read "960 Mbps" as you have indicated
    • It was determined during characterization that this device is not capable of exceeding 65MSPS on a 1-wire interface; the setup and hold times degrade substantially.  This is why the Table 2 stops at 65MSPS.

    If you absolutely want to use 1-wire interface, I recommend looking at the ADS5296A ADC from TI.  It can sample at 80MSPS on the 1-wire interface yielding the same performace of the ADS5292 for the same power consumption and price but in a smaller package.  Hope this helps.

    Regards,

    Christian

  • 0 in reply to Christian Yots
    Expert 1950 points

    Hello Christian,

    thanks a lot for your answer. The ADS5296A looks nice and has some realy cool features.

    Is there a pin compatible 14 bit version of the ADS5296A available?

    Regards,

    Niels

  • 0 in reply to Niels Koll
    TI__Genius 14540 points

    Hi Niels,

    The ADS5294  is our 14-bit octal ADC and is, unfortunately, not pin compatible with the ADS5296A.  It is pin for pin compatible with the 12-bit ADS5292 of which you are familiar.

    Here is a list of Octal ADCs presently available from the HealthTech BU at Texas Instruments:

     

    ADS5296A: 10-Bit, 200-MSPS, 4-Channel / 12-Bit, 80-MSPS, 8-Channel ADC
    Product Folder: http://www.ti.com/product/ADS5296A
    Datasheet (PDF): http://www.ti.com/litv/pdf/sbas631

    ADS5292: Octal Channel 12-Bit, 80MSPS High-SNR and Low-Power ADC
    Product Folder: http://www.ti.com/product/ADS5292
    Datasheet (PDF): http://www.ti.com/litv/pdf/slas788b

    ADS5294: Octal Channel 14-Bit, 80MSPS High-SNR and Low-Power ADC
    Product Folder: http://www.ti.com/product/ADS5294
    Datasheet (PDF): http://www.ti.com/litv/pdf/slas776c

    ADS5295: Octal Channel 12-Bit, 100MSPS High-SNR and Low-Power ADC
    Product Folder: http://www.ti.com/product/ADS5295
    Datasheet (PDF): http://www.ti.com/litv/pdf/sbas595

     

    In addition, we have the following available for pre-release evaluation under NDA:

     

    ADS5290: 12-Bit, 80-MSPS or 10-Bit, 100MSPS 16-Channel ADC; 12-Bit, 40MSPS or 10-Bit, 50MSPS 32-Channel ADC on LVDS interface

    ADS52J90: 12-Bit, 80-MSPS or 10-Bit, 100MSPS 16-Channel ADC; 12-Bit, 40MSPS or 10-Bit, 50MSPS 32-Channel ADC on JESD204B interface

     

    Regards,

     

    Christian Yots

    Healthtech/MBU

    Texas Instruments

  • 0 in reply to Christian Yots
    Expert 1950 points

    Christian,

    many thanks. If you ever plan to build a 16/14 Bit version of the ADS5296A, please tell me.

    King regards,

    Niels