PCM5100APW

ADCs/DACs - Special Purpose Overview

The PCM5100APW is a stereo audio digital-to-analog converter (DAC) from Texas Instruments, housed in a 20-pin TSSOP package. It supports I2S interfaces with sampling rates up to 384 kHz and 32-bit resolution. Key electrical specifications include a signal-to-noise ratio of 100 dB, dynamic range of 100 dB, and THD+N of 0.0025%. The device operates on dual power supplies: 1.65 V to 1.95 V for the digital section and 3 V to 3.6 V for the analog section. It features DirectPath output technology, eliminating the need for external coupling capacitors, and delivers a typical output voltage of 2.1 VRMS.

ADCs/DACs - Special Purpose Feature Summary

• Supports high-resolution audio with 32-bit depth and sampling frequencies up to 384 kHz via I2S interface.
• Integrates an internal PLL to generate master clock when MCLK is absent, enabling 3-wire I2S operation.
• Features DirectPath output architecture for capacitor-free connections to amplifiers or speakers.
• Delivers high-fidelity performance with 100 dB SNR, 100 dB dynamic range, and 0.0025% THD+N.

ADCs/DACs - Special Purpose Applications

• High-fidelity stereo audio systems requiring low distortion and high dynamic range.
• Digital preamplifiers and audio processors utilizing I2S digital input.
• Portable audio devices leveraging the low-power consumption modes and compact TSSOP-20 packaging.
• Multi-DAC synchronization setups where phase-aligned outputs are required across multiple units.

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'PW' confirms the TSSOP-20 package variant. Confirm RoHS compliance status through official manufacturer documentation. Ensure supply chain sources provide genuine Texas Instruments components to avoid counterfeit risks associated with audio ICs. Check for availability of the tape-and-reel version (PCM5100APWR) if automated assembly is planned instead of tube packaging.

ADCs/DACs - Special Purpose Selection Notes

Select this component when a stereo DAC with integrated PLL and DirectPath outputs is required. It is suitable for designs lacking an external master clock source, as it can generate its own clock from BCK/LRCK. Compare against the PCM5102 for higher channel counts or the PCM5122 for improved jitter performance. Ensure the host processor supports I2S left-justified or standard I2S data formats compatible with the chip's input requirements.

ADCs/DACs - Special Purpose Part Context

The PCM5100APW belongs to the PCM5100A series of stereo audio DACs. It serves as a bridge between digital audio sources and analog playback stages. The 'A' designation indicates revisions with optimized performance characteristics compared to earlier iterations. It is distinct from the TAS5100ADAP, which is a Class D audio amplifier, not a DAC.

ADCs/DACs - Special Purpose Replacement Considerations

Direct pin-compatible replacements within the same family include the PCM5100A in other packages. For upgraded performance, consider the PCM5122 which offers lower jitter and higher SNR. If more channels are needed, the PCM5102 provides four channels. Verify that any substitute maintains the 3V/1.8V dual-supply requirement and I2S interface compatibility.

ADCs/DACs - Special Purpose FAQ

Can the PCM5100APW operate without an external MCLK?

Yes, the device contains an internal PLL that generates a master clock from the bit clock (BCK) and word clock (LRCK), allowing it to function in a 3-wire I2S configuration.

What is the relationship between LRCK and BCK for standard I2S?

For standard I2S operation, the bit clock (BCK) should be an integer multiple of the word clock (LRCK). Common ratios include 128x or 256x, depending on the data width and sampling rate.

How does DirectPath technology benefit the design?

DirectPath output eliminates the need for large external DC-blocking capacitors at the output stage, reducing board space, cost, and potential signal degradation associated with passive components.