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Transimpedance Amplifier

vinay bhatt
Prodigy 220 points

In Reference Design TIDU672C - it is mentioned that transimpedance amplifier is used for converting current of audio DAC to voltage. Why it is not considered as Voltage Amplification?

  • 0
    TI__Mastermind 23210 points

    Hey Vinay, 

    It is considered transimpedance because the DAC is a current output as opposed to a voltage output. The current flows through the gain resistor in the feedback of the Op Amp and appears as a voltage at the Op amp output. 

    I hope this explanation helps. Let me know if you have any further questions. 

    Best Regards, 

    Chris Featherstone

  • 0 in reply to Chris Featherstone
    Guru 48395 points

    Actually, figure 2 is convolving a couple of issues. A lot of Dac's are current output where transimpedance is the right term, here - it is shown as a voltage source through a gain R so a voltage amplifier is closer to what the figure is showing