Independent measurements (from e.g., L7Audiolab ) show the SA9123L’s onboard clock recovery has over USB. That’s fine for $50 DACs, but audible? Probably not. However, an XMOS chip with external Crystek clocks can get down to 50 ps. For critical listening, use the SA9123L in asynchronous mode with a good external oscillator on the DAC side.
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The SA9123L is a reliable alternative to the more common A4988 or DRV8825 drivers. It offers smooth micro-stepping and decent current handling, though it runs hotter than expected without active cooling. sa9123l driver