DSD1794DBRG4

ADCs/DACs - Special Purpose Overview

The DSD1794DBRG4 is a stereo digital-to-analog converter featuring 24-bit resolution and support for both PCM and Direct Stream Digital (DSD) audio formats. It utilizes an advanced-segment DAC architecture to achieve high dynamic performance, including a typical dynamic range of 132 dB in mono mode at 9 V RMS output. The device accepts sampling frequencies from 10 kHz to 200 kHz for PCM and 2.8224 MHz for DSD, with system clock autodetection. Key electrical specifications include a THD+N of 0.0004%, differential current outputs of 7.8 mA p-p, and dual-supply operation requiring 5 V analog and 3.3 V digital rails.

ADCs/DACs - Special Purpose Feature Summary

• Supports PCM (Standard, I2S, Left-Justified) and DSD data formats
• Advanced-segment DAC architecture with 8x oversampling digital filter
• High dynamic performance: 132 dB dynamic range (Mono), 129 dB (Stereo)
• I2C-compatible serial port for user-programmable controls

ADCs/DACs - Special Purpose Applications

• A/V Receivers
• SACD Players
• DVD Players
• HDTV Receivers
• Car Audio Systems

ADCs/DACs - Special Purpose Procurement Notes

Verify the component authenticity by checking the marking code 'DSD1794' on the 28-lead SSOP package. Confirm the ordering suffix matches the tape and reel transport media indicated by the 'R' in DSD1794DBRG4. Ensure the supply voltage requirements align with the specified 5 V analog and 3.3 V digital rails before integration.

ADCs/DACs - Special Purpose Selection Notes

Select this component for applications requiring native DSD decoding alongside standard PCM processing. The device supports external digital filter interfaces, allowing compatibility with specific DSPs or filters like the DF1704. Designers must account for the dual-supply requirement and ensure the system clock frequency matches one of the supported multiples (128fS to 768fS) for proper operation.

ADCs/DACs - Special Purpose Part Context

The DSD1794 belongs to Texas Instruments' family of high-performance audio DACs utilizing advanced-segment technology. It is designed to interface directly with audio DSPs and decoder chips, providing balanced current outputs to optimize external analog circuitry. The device replaces older Burr-Brown designs while maintaining compatibility with industry-standard audio interfaces.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed direct substitutes include the DSD1794ADB. Other variants within the same package and specification set are DSD1794DB and DSD1794DBR.