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Original question:

ADS5407: Replacement for ADS5407

ADS5407: ADC31JB68

Mircea Bogdan
Intellectual 370 points

Part Number: ADS5407
Other Parts Discussed in Thread: ADS54J64, ADC12QJ1600, ADC16DX370, ADS4449, ADC31JB68

Hello,

Please, read the previous questions and answers related to the ADS5407.

So, we plan a 4,000-Channel, 14-BIT, 500MHz ADC system with simultaneous sampling.

I'm looking for the best part with respect to noise levels and power/channel.

Our limitation is that we can't do more than 6Gbps on the JESD204B serial interfaces.

Questions:

Is ADC31JB68RTAT the best part for the job?

Is this a true one-channel 500MHz ADC, and is not made up of two inteleaved ADCs like the ADS5407?

Can it work simultaneously on a 8ns clock supplied to all 4,000 Channels?

Is this a new part that was not available in 2018?

Thank you very much.

Best regards,

Mircea

  • 0
    TI__Mastermind 18095 points

    Mircea:

    For a 4000-element system, channel integration is likely a key concern for you.  In the aforementioned post, the ADS54J64 was offered.  This quad device is still viable.  It is interleaved, but with forced high pass/low pass 2x decimation you can effectively get 500 MSPS operation without interleaving spur degradation.

    There is a new quad ADC available: ADC12QJ1600.  This is a 12-bit ADC operating up to 1600 MSPS.  Of course, it can be clocked at a lower speed.  You can check if its 12-bit performance is suitable on ti.com.

    Another option is the AFE79xx family of devices which is a 4T4R2F RF sampling transceiver.  This device can be configured as a 6-ADC device and the DACs can be turned off if not needed.  It sports a 3 GSPS non-interleaved ADC and can be clocked as low as 1.5 GSPS.

    The ADC31JB68 is a good device, but only one channel.  It seems like it is not the best solution for multi-elements.  If lower bandwidth, lower sampling rates are potentially acceptable, then you can explore the ADC16DX370 (Dual, 16-bit, 370 MSPS) or the ADS4449 (Quad, 14-bit, 250 MSPS).

    --RJH

  • 0 in reply to RJ Hopper
    Intellectual 370 points

    Hi RJ,

    Please, tell me why is the ADC31JB68 not the best solution for a 4,000-channel system.

    Can it do precise simultaneous 500Msps sampling, while receiving a 125MHz clock?

    Can it transmit the data on only two 5Gbps lines?

    Is this an active part, that will be available for the next 2-3 years?

    What is the disadvantage if we use this device?

    The fact that is only one channel is not a problem.

    We are open to other parts if better.

    If you suggest another part, please tell me why the other part would be better.

    Thank you very much,

    Mircea

  • 0 in reply to Mircea Bogdan
    TI__Mastermind 18095 points

    The ADC31JB68 is perfectly fine.  My only issue was the single channel.  If that is OK then the device is a very good non-interleaved 500 MSPS ADC.

    --RJH

  • 0 in reply to Mircea Bogdan
    Intellectual 370 points

    Hi RJ,

    Thank you for telling me that this product is OK.

    In order for us to decide which ADC chip we use, we need answers to all  the following questions:

    1. Can it do precise multi-channel simultaneous 500Msps sampling, while receiving a 125MHz clock?

    2. Can it transmit the data on only two 5Gbps lines?

    3. Is this an active part, that will be available for the next 2-3 years?

    4. Is there a part that would be better, while keeping the specs: 14-BIT or more, 500Msps or more, not interleaved, simultaneous sampling from a 125MHz clock. ?

    Thank you very much,

    Mircea

  • 0 in reply to Mircea Bogdan
    TI__Mastermind 18095 points

    Please see below.  --RJH

    1. Can it do precise multi-channel simultaneous 500Msps sampling, while receiving a 125MHz clock?

    RJH>> Yes.

    2. Can it transmit the data on only two 5Gbps lines?

    RJH>> Yes

    3. Is this an active part, that will be available for the next 2-3 years?

    RJH>> Yes

    4. Is there a part that would be better, while keeping the specs: 14-BIT or more, 500Msps or more, not interleaved, simultaneous sampling from a 125MHz clock. ?

    RJH>> No.

  • 0 in reply to RJ Hopper
    Intellectual 370 points

    Thank you,

    Mircea