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DAC7552: Serial interface programming of DAC7552

Johnson Tsai
Prodigy 70 points
Part Number: DAC7552

Hi, I saw in DAC7552 data sheet that either input register or both input & DAC register of each channel can be updated using the serial interface programming commands specified in Table 1. My question is, what's the difference between updating only input register and updating both input & DAC register? Which one will give instantaneous output voltage change after serial data transfer? 

Thank you in advance for your help.

  • 0
    TI__Guru 53173 points
    Hello Johnson,

    Updating only the input register will not update the output of the DAC. Only when the DAC register is written will the output actually change. If you want to update a channel immediately, you can use one of the Single Channel Update commands. If you are looking to update both channels simultaneously, you can issue a Single Channel Store command for register A (control bits 'b0000), then an update command for both A-B (control bits 'b1010).

    Thanks!
    Paul