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Re:TLV5624

Santosh PG
Expert 1590 points
Other Parts Discussed in Thread: TLV5624

Hi Everyone,

I am using TLV5624 for D/A conversion in my application as my requirement is to generate 0-5V analog output but in datasheet it is confusing as marked in red

in the attachment.

They mentioned reference input voltage range is 0.3V to Vdd+0.3V and again in recommended condition it is mentioned as 0 to Vdd-1.5V for 5V supply to TLV5624.

So please clear my confusion and let me know the reference voltage and supply voltage to TLV5624 to generate 0  - 5V.

Best Regards,

Santosh.

  • 0
    TI__Expert 6925 points

    Hi Santosh,

    -0.3V to Vdd-0.3V is the absolute rating. This means that the part will not be damaged while the reference voltage is within this range, but proper operation is not guaranteed over all this range. Proper operation is only guaranteed if the reference voltage is within AGND and Vdd-1.5V.

    Since the output stage has a gain of 2, 0 to 5V range is obtained with a 2.5V voltage reference so that:
    Vout_max  = 2.5V * 2 *255/256 = 4.98V
    Vout_min = 2.5V * 2 * 10/256 = 0.195V

    Please note that linearity specs are only valid for codes 10 to 255.

    Also, to be able to output 5V, Vdd should be between 5.4V and 5.5V. This is because the output MAX is Vdd-0.4V.

    As a simple example, a 5.5V regulated supply for Vdd can be implemented with a REG1117-5 as follows:

     

    Let us know if this information helps.

    Best regards,
    Rafael

  • 0
    TI__Guru**** 174076 points

    Hi Santosh,

    Take a look at page 10 of the TLV5624 data sheet where the transfer function is described.  This DAC has a 'times two' buffer internal to the silicon structure (refer to page 2 for a block diagram).  There is also an internal reference (see page 12) that can be set for either 1.024V or 2.048V.  Using the internal reference option, you can get either 2.048V or 4.096V output with a 5V supply.  If you need to reach 0-5V on the output, you would need to use an external 2.5V reference and have the analog rail at 5.4V minimum (see the VO spec on page 4).

  • 0 in reply to Rafael Ordonez
    Expert 1590 points

    Hi Rafael,

    Thanks for the suggestion so I understood that I can get the output voltage of 0-4.6V if I provide 5V supply and 2.5V reference voltage.

    So if you have any sample code(MSP430 MCU prefered) for the same please send it us which will be really helpful to us.

    Best Regards,

    Santosh