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ADC31RF80: Data sheet question

William Craig
Prodigy 60 points
Part Number: ADC31RF80

On page 27 of the data sheet there is a statement

The ADC31RF80 is a single-channel, 14-bit, 2949.12-MSPS, telecom receiver and feedback device containing
an analog-to-digital converter (ADC) followed by multi-band digital down-converters (DDCs), and a back-end
JESD204B digital interface

This statement seems to indicate that the ADC in this device is not a 3000 MSPS ADC but rather a 2949.12 MSPS ADC.  Other parts of the data sheet clearly say that the ADC is a 3000 MSPS device.  What am I missing and why does the data sheet say 14 bit 2949.2 MSPS ADC?

Thanks

  • 0
    TI__Genius 10505 points

    Hi William,

    In section 6.5 Electrical characteristics, typical input clock frequency is given as 3GSPS indicating that 3GSPS is supported. 

    All the datasheet characterization is done at 2949.12 MSPS as this is a popular telcom sampling rate. As these frequencies are close-by, they are interchangeably used in datasheet. 

    Regards,

    Vijay