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Texas Instruments Data converters for Xilinx FPGA

Other Parts Discussed in Thread: ADS5281EVM, ADC3424, ADS6445, ADS5281

Hello,

We are looking for ADC converters compatible with Xilinx's FPGA. We have found these two evaluation boards: ADS5281EVM (12 bits resolution, 8 channels and 50 MSPS) and ADS5287EVM (10 bits resolution, 8 channels and 65 MSPS). We have read in this documents that these converters have a Serial interface to configure them, and these interface is driven to an USB and controled with a Software running in a PC.

We wondered if there is any way to control these serial interface and these converters only using the FPGA ? . I mean, if is there any way to pass these serial interface´s pins to the FPGA to configure the converters here, without needing to use the USB and the software ?

Thank you.

Sincerely,
Javier Nuñez Sanchez

  • Hi,

    The circuit board for these EVMs connect the signals for the SPI configuration only to the USB chip.   On some later EVMs for other devices we did make provision for the SPI signals to be driven by either the USB chip or by pins from the connector to the FPGA board, but that was after the EVM for these devices was done.   You would have to do some soldering modification to the EVM to remove the USB device and connect the SPI signals to something else if you wanted to have the FPGA drive the SPI signals.    An example of an EVM that does have the SPI signals driven by the FPGA on the other side of the connector would be the ADS6445 family of 4 channel 12 and 14bit converters, or the newer lower power ADC3424 family of 4 channel 12 bit converters.    But the EVM for the 8 channel devices did not bring the SPI signals to the FPGA connector.

    Regards,

    Richard P.

  • Hello,

    I have read in the page 16 of the ADS5281 datasheet (http://www.ti.com/lit/ds/symlink/ads5281.pdf ) That "after power-up, the internal registers must be initialized to the respective default values".

    I wonder if using the Evaluation Board of this ADC it is also needed to reinitialized the internal registers after power-up or they are internally stored instead ?

    I mean if is possible to configure the ADC via USB cable only one time and that this configuration could be loaded at every power-up without using the USB interface ?

    Thank you.

    Sincerely,

    Javier Nunez.