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12 bit daq

pavan koundinya
Prodigy 10 points
Other Parts Discussed in Thread: MSP430F1611

value 47E written to DAC12_DATA register and value FFF witten to the same register produces an output voltage of 0.7V and 1.34V respsectively,

How to relate the two? 

  • 0
    Guru 227245 points

    pavan koundinya said:
    How to relate the two? 

    They don't. 0xfff should produce the reference voltage, and 0x47e should produce 28% of the reference.
    0.7V is what to expect on 0x47e and 2.5V reference.

    I guess you have a load that exceeds teh driving capacitoy of the DAC when the voltage exceeds a threshold between 0.7V and 1.34V. Maybe a diode? Maybe a low-impedance resistove load?
    You didn't write which MSP you use, so assuming the MSP430F1611 (with DAC12), the amximum load current on 3V is 1mA, which is exceeded at 1V with 1kOhm load. Minimum load resistance for 2.5V output is 3kOhm. And don't forget to set DAC12AMPx if you need a 1mA output current or fast output settling speed/slew rate.

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