DSD1794DB

ADCs/DACs - Special Purpose Overview

The DSD1794DB is a stereo digital-to-analog converter (DAC) from Texas Instruments, housed in a 28-lead SSOP package. It supports both PCM and Direct Stream Digital (DSD) audio formats with 24-bit resolution. The device features an advanced-segment DAC architecture for high dynamic performance, achieving up to 132 dB dynamic range in mono mode and 129 dB in stereo mode at 4.5 V RMS output. It operates on dual supplies: 5 V analog and 3.3 V digital, with 5-V tolerant digital inputs. Sampling frequencies range from 10 kHz to 200 kHz for PCM and 2.8224 MHz for DSD.

ADCs/DACs - Special Purpose Feature Summary

• Dual-format support for PCM (Standard, I2S, Left-Justified) and DSD audio data.
• High-performance analog specifications including 0.0004% THD+N and 127–132 dB dynamic range.
• Integrated 8× oversampling digital filter with selectable sharp or slow rolloff characteristics.
• I²C-compatible serial port for user-programmable controls such as digital attenuation and de-emphasis.

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 status before procurement, as the DSD1794DB is listed as obsolete by some distributors. Confirm availability of direct replacement parts like the DSD1794ADB if new production units are required. Ensure the specific package marking and revision match the design requirements.

ADCs/DACs - Special Purpose Selection Notes

Select this component for applications requiring simultaneous PCM and DSD decoding capabilities. The 28-lead SSOP package is suitable for space-constrained designs. Verify that the system clock generator can provide the required frequencies (128fS to 768fS) and that the external circuitry supports the differential current outputs for optimal analog performance.

ADCs/DACs - Special Purpose Part Context

The DSD1794DB belongs to the DSD1794 family of high-fidelity audio DACs. It utilizes Texas Instruments' advanced-segment architecture to improve tolerance to clock jitter. The 'DB' suffix indicates the 28-lead SSOP package variant with an operating temperature range of –25°C to 85°C.

ADCs/DACs - Special Purpose Replacement Considerations

The DSD1794ADB is identified as a direct replacement for the DSD1794DB. Both share the same 28-lead SSOP package and functional specifications. Verify pin compatibility and thermal characteristics when substituting.