PCM2705DB

ADCs/DACs - Special Purpose Overview

The PCM2705DB is a stereo audio digital-to-analog converter (DAC) manufactured by Texas Instruments, originally part of the Burr-Brown portfolio. It integrates a USB interface controller to facilitate direct connection to personal computers without requiring external clocking or complex host drivers. The device supports 16-bit resolution and operates at sampling rates up to 48 kHz. Key electrical specifications include a signal-to-noise ratio (SNR) of 98 dB and a supply voltage range of 3 V to 5.25 V. It features separate outputs for headphones and S/PDIF digital audio, housed in a 28-pin SSOP package suitable for surface-mount assembly.

ADCs/DACs - Special Purpose Feature Summary

• Integrated USB 2.0 Full-Speed interface controller eliminates need for external USB transceivers
• Stereo 16-bit DAC with 98 dB SNR performance
• Dual output capability: dedicated headphone amplifier drive and S/PDIF digital output
• Bus-powered operation with software-controlled power management states

ADCs/DACs - Special Purpose Applications

• USB-connected desktop speakers and multimedia audio systems
• Portable MP3 players and digital audio recorders
• Computer peripheral audio interfaces
• Low-cost stereo audio decoding modules

ADCs/DACs - Special Purpose Procurement Notes

Verify the manufacturer designation carefully, as Texas Instruments acquired Burr-Brown; current datasheets list Texas Instruments as the producer. Confirm the suffix 'DB' indicates the SSOP-28 tube packaging variant rather than the 'DBR' reel variant. Check RoHS compliance status via the specific datasheet revision, as older Burr-Brown branded units may differ from modern TI equivalents like the PCM2705DBRG4.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a compact solution for USB audio streaming is required without external PHY chips. Ensure the design supports 48 kHz maximum sampling rate, as higher rates are not supported. Verify that the 3V to 5.25V supply range aligns with the system's available power rails. Consider the PCM2705DBRG4 if tape-and-reel packaging is preferred for automated assembly over the standard tube format.

ADCs/DACs - Special Purpose Part Context

This component belongs to the PCM2705 family of USB audio DACs. It serves as a bridge between digital USB hosts and analog audio outputs. Related variants include the PCM2705DBR (reel packaging) and PCM2705DBRG4 (RoHS-compliant version). The device simplifies audio design by combining the DAC, USB controller, and clock recovery circuitry into a single IC.

ADCs/DACs - Special Purpose Replacement Considerations

The PCM2705DBRG4 is a direct pin-compatible replacement offering RoHS compliance. For non-USB applications, general-purpose stereo DACs may be considered, but they require external USB controllers. No other direct functional substitutes with integrated USB interfaces are publicly confirmed for this specific package and parameter set.