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DAC5662A: Output regulation with variable amount of IOUTFS (IREF ) by an operational aplifier

Robert Thomas21
Prodigy 160 points
Other Parts Discussed in Thread: DAC5662A

Hallo support team,


we want to use the DAC5662A in order to drive our outputsignal. The outputcurrent should be variable in a range of 20dB.

The outputcurrent is controlled by IOUTFS (IREF=32xVREF/RSET).

Is it possible to control this outputcurrent by an operational amplifier, which control the BIASJ_A and BIASJ_B outputcurrent ?

Do you have a suggestion about  an regulation circuit?

We want to vary the outputcurrent from 2mA to 20mA (20dB).

Thank you in advance for answering my question.

Kind Regards

R. Thomas

  • 0
    TI__Mastermind 20541 points
    Hi Robert,

    You can apply external reference voltage at EXTIO pin. Please make sure you are within the compliance voltage for EXTIO pin (0.1V to 1.25V). And use appropriate resistor on BIASJ_A and BIASJ_B pins to ground. You should be able to vary the external reference voltage and IOUTFS should vary accordingly.

    Regards,
    Neeraj Gill