Device and method for testing of digital-to-analog converter

A system comprising:

• a current-steering digital-to-analog converter (DAC) comprising an input to receive a drive code value and an output to provide an output current having a magnitude based on the drive code value;
• and
• a test component comprising:
• a relaxation oscillator comprising an input coupled to the output of the current-steering DAC, the relaxation oscillator configured to output a signal having an oscillation frequency based on a magnitude of the output current;
• and
• a test verify module configured to determine an operational characteristic of the current-steering DAC based on the oscillation frequency of the signal.

A method comprising:

• providing a first current-steering digital-to-analog converter (DAC) configured to provide an adjustable first output current based on an input test value;
• providing a second current-steering DAC configured to provide an adjustable second output current based on an input test value;
• providing a relaxation oscillator configured to output a signal having an oscillation frequency based on a magnitude of a sum of the first output current and the second output current;
• configuring the first current-steering DAC to step through a series of monotonically increasing test values starting at a first test value of the series and ending at a last value of the series and the second current-steering DAC to concurrently step through the series starting at the last test value and ending at the first value, each step of the series having a fixed duration;
• determining an oscillation count of the signal for each step of the series to generate a plurality of oscillation counts;
• and
• determining an operational characteristic based on the plurality of oscillation counts.