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ADC08D502: Question about the sample rate

Wayne Wang20
Expert 4360 points
Part Number: ADC08D502
Other Parts Discussed in Thread: ADC08D500

Hi team,

When I read the ADC08D502 datasheet, it said it's a Dual 8-Bit, 500 MSPS A/D Converter. I noticed that it has 2 ADC cores inside the chip. So my question is what's the definition of the 500Msps? Which one is correct between a and b as below?

a. Each ADC core can do 500Msps, so 2 ADC cores can sample the same input at 1Gsps with interleaving.

b. Each ADC core can only do 250Msps, the 2 ADC cores can sample the same input at 500Msps with interleaving.

What's more, when I read ADI AD9288BST-100 datasheet, it said it's a Dual 8-Bit 100 MSPS ADC. So for this device, each ADC core can sample at 100Msps or 50Msps?

I am just a little confused about the sample rate claim in the datasheet between TI and ADI. So hope you could help on this. Thanks.

Best regards,

Wayne

  • 0
    TI__Guru* 91947 points

    Wayne,

    This part has two internal ADC cores, each capable of sampling data at 500Msps. Both ADC's have a demux 16 bit output (interleave data). This output data bus runs at 1/2 the sample rate of the ADC. The user will have to properly interleave the two 8 bit output words to create a single 8 bit word stream.

    Regards,

    Jim

  • 0 in reply to jim s
    TI__Expert 4360 points

    Hi Jim,

    I noticed that we also have ADC08D500 which is similar to ADC08D502. I noticed that ADC08D500 datasheet said it have interleave mode. So can you help explain the difference between ADC08D500 and ADC08D502 on the interleave function? Thanks.

    Best regards,

    Wayne

  • 0 in reply to Wayne Wang20
    TI__Guru* 91947 points

    Wayne,

    The ADC08D500 has the option to interleave one of the inputs and send it to both ADC's for 2x sampling (1GHz). This is the main difference.

    Regards,

    Jim