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WEBENCH® Tools/TMS320F28335: External interface with DAC(dac 3161)

sangeetha duraisamy
Prodigy 140 points
Part Number: TMS320F28335
Other Parts Discussed in Thread: DAC3161

Tool/software: WEBENCH® Design Tools

Hi,

How to interface  external DAC 3161 with TMS320F28335. 

    

Thanks

regards,

d.sangeetha

  • 0
    TI__Mastermind 42195 points

    Sangeetha,

    Sure, we can probably find a good interface solution to the F28335 device. What type of communication were you planning on using from the DAC3161? The options should be listed in its datasheet here: http://www.ti.com/lit/gpn/dac3161 

    Regards,
    Cody 

  • 0 in reply to Cody Watkins
    Prodigy 140 points

    Hi sir,

     sorry Now we are changed the DAC part number AD5687R.

    we are plan to connect TMS320F28355 and AD5687R using SPI interface.

    will you please tell my pin configuration is right or wrong....

    DSP side  --------    DAC side

    SPISIMOA(GPIO 16) ------ SDI

    SPISOMI(GPIO 17) ------ SDO

    SPICLKA(GPIO 18) ---- SCLK

    SPISTEA(GPIO 19) ---LDAC(acive low pin)

    GPIO 20  ------- SYNC(active low pin) 

     

    Thank you 

    Regards 

    d.sangeetha

  • 0 in reply to sangeetha duraisamy
    TI__Mastermind 42195 points

    Sangeetha,

    I glanced at the datasheet for the AD5687R, and it appears that they connect the slave enabled "SPISTEA" to the SYNCn signal and a GPIO to LDACn. FYI "SPISTEA" is the slave enable from the C2000 device.

    You will need to read through their data sheet and double check if that is correct. However, the rest of the pins are connected correctly.

    If you change to a newer C2000 device you could get one with an integrated 12-bit buffered DAC! The TMS320F2837x family is probably the closest to the F28335. There is also a lower cost 100Mhz device that also has a buffered DAC, the TMS320f28004x family.

    http://www.ti.com/product/TMS320F28379D

    http://www.ti.com/product/TMS320F280049C

    Also if you would like to stay with an external DAC, there are a good number of TI DACs that you could also use. (which you would get fantastic support for on that E2E forum provided you ran into technical issues. pin connections, layout, SPI communications issues, etc.)

    12bit-DACs 

    16bit-DACs

    Regards,
    Cody