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DAC0800: DAC IC chips

Tobias Rozario
Prodigy 50 points
Part Number: DAC0800
Other Parts Discussed in Thread: DAC0802,

Are the DAC IC chips produced by texas instruments are compatible with the comtrade filing system? I've been specifically looking into DAC0802 and DAC0800.

  • 0
    TI__Genius 14220 points
    Hi Tobias,

    Welcome to E2E. Could you please provide little more details on the application?

    Regards,
    Uttam Sahu
    Applications Engineer, Precision DACs
  • 0 in reply to Uttam Sahu
    Prodigy 50 points
    The overall goal of my research project is to fix this relay test system the SEL4000 which currently isn't working with the relay SEL451. Data needs to be stored into a COMTRADE filing format system. I believe the dac's application will convert digital input into analog output in order to simulate current for the relay system.
  • 0 in reply to Tobias Rozario
    TI__Genius 14220 points
    Hi Tobias,

    The DAC is s simple device that converts a parallel digital signal to analog. The digital signal has to be in the format specified in the datasheet. You need an interpreter software module that can convert the COMTRADE format to the DAC format.

    Regards,
    Uttam
  • 0 in reply to Uttam Sahu
    Prodigy 90 points
    Can you tell me more about this device. I am trying to output a digital signal (8-bit) to the DAC and get the corresponding analog signal. When I output "127", I get "0V" from the DAC, when I output "0", I get "5V" from the DAC. Is this do to the formatting? I couldnt find it in the datasheet, can you please tell me what the formatting is? Why isnt it a simple binary format? Is there any way to change the reference voltage to "0V" and "5V" instead of "0V" and "10V", so I get "5V" when I input "255" to the DAC?

    I have made a circuit with PIC16F690 and DAC0800 (its in the attachments), but I get a bad result from the DAC as output voltage. For "127" output from the MCU I get "0V", for "0" I get "5V". The idea is to sample a signal from the in-built ADC and output the same signal to the DAC. The ADC and MCU part are working OK. But can someone tell me, why do I get this error from the DAC? Like this when I increase the ADC input, the DAC output gets decreased and when I decrease the ADC input, the DAC output gets increased.

    I can solve it by coding, but I want to know is this the proper way and what am I mistaking? I used the datasheet to build the circuit.

    Vref+ = 10V
    Vref- = 0V
    V+ = 36V
    V- = -36V
    THRSH control pin = ground so I can use TTL logic.
    B1 (DAC PIN) = MSB (RC7 on PIC16F690)
    B8 (DAC PIN) = LSB (RC0 on PIC16F690)

    The analog peripherals of the MCU are disabled in order for the PINs RC0, RC1, RC2 to be used as digital (comparator, comparator, CVref).

    Can anyone help me please?

    Circuit:
    www.dropbox.com/.../ADC to DAC circuit.jpg
  • 0 in reply to Arakel Horov
    TI__Genius 14220 points
    Hi Tobias,

    I am not able to open the link due to HTTPS certificate error. Could you please attach the image directly here?

    As this is a fairly unrelated question to your previous one, we would appreciate if you could post it as a new query. This would help us and other users better. It is very difficult to track the progress of the threads that have multiple questions. Hope you understand.

    Regards,
    Uttam
  • 0 in reply to Uttam Sahu
    Prodigy 90 points
    Its posted to the the new thread:
    e2e.ti.com/.../610769