Cx31993 Datasheet -

Implement a solid ground plane. Keep the noisy digital ground paths associated with the USB controller isolated from the sensitive analog ground paths of the DAC and microphone amplifier, joining them only at a single "star ground" point under the chip.

Mara kept the original datasheet framed in her office. Beneath it she hung a small plaque engraved with one line from the document’s final page: “Designed for precision in constrained environments.” It read, to her, like a promise. cx31993 datasheet

A reference implementation for a USB-C dongle: Implement a solid ground plane

The CX31993's straightforward architecture allows for a simple and minimal external component count, enabling compact, high-performance designs. In its most common configuration—a USB-C to 3.5mm audio adapter—the chip operates as a standalone solution, requiring only a few passive components and an audio jack connector to function. Many products take this further by pairing the CX31993 with a dedicated headphone amplifier chip, most notably the , to boost output power for more demanding headphones. This DAC+AMP combo is widely regarded as a cost-effective and powerful "reference design" for many budget-friendly "dongles" and "small tail" DACs. Beneath it she hung a small plaque engraved

The is a cornerstone of the modern portable audio market. It offers a compelling package of high-resolution audio support, an extremely clean signal path, and wide device compatibility, all while requiring minimal power. While the official datasheet remains difficult to access publicly, the wealth of technical information available from component distributors, application notes, and community testing provides a complete picture of its capabilities.