PCM1794 Search Results: PCM5102 I2S DAC Boards

Searching for PCM1794? Identify the DAC fitted to the actual board

The products currently shown in this collection describe assembled PCM5102-based I2S audio DAC boards, not an identified PCM1794 loose IC or PCM1794-equipped board. “PCM1794” appears in comparison-oriented product headings such as “Beyond ES9023 PCM1794”; that wording does not establish a PCM1794 component, equivalent electrical design or replacement compatibility. For a PCM1794-specific repair, PCB build or bill of materials, confirm the exact marked converter and schematic on the selected product before ordering. This page keeps the current product choices visible while explaining their actual described function.

What the available modules convert

The assembled boards described here accept a digital audio serial stream, in I2S or left-justified format where that mode is provided, and generate an analog stereo signal through their own board-level output circuitry. The signal path requires a suitable upstream digital audio source supplying the expected serial clock, left/right word clock and data format. A DAC board is not an analog-to-digital recording input; a bare digital interface header is not a USB audio input or a standalone music player. Product titles saying “sound card” and “for Arduino/Raspberry Pi” do not by themselves supply a USB receiver, operating-system configuration, software library, case or music source.

Most listings give the converter as PCM5102 and quote a board supply of DC 5–10 V, up to 32-bit/384 kHz digital-audio data, normal and low-delay filter settings, and approximately 2.1 V RMS output, 112 dB signal-to-noise ratio and −93 dB distortion. Those are seller-stated board figures, not verified measurements or PCM1794 performance. One separate Raspberry Pi pHAT listing instead states 24-bit/192 kHz audio via the Pi's I2S GPIO connection and a fitted 3.5 mm stereo line-out jack. Do not apply the 384 kHz or 5–10 V claims of a different module to the pHAT, or assume the pHAT's Raspberry Pi pinout applies to a 48 × 48 mm DAC board.

Product forms and what each option means

• Assembled PCM5102 board, choices C / B / A: one product uses single-letter “Color” variants and describes two board styles. Its style 1 section specifies an approximately 4.8 × 4.8 cm PCB, I2S/left-justified selection and FLT filter control. Its style 2 section additionally describes a 3.5 mm headphone connector. The listing does not clearly map A, B and C to those style descriptions in text. Do not assume a particular letter has a headphone jack; confirm the corresponding variant photo and board markings. The described shipment is one selected DAC board, not three styles together.
• Assembled PCM5102 board, choices 01 / 02 / 03: a second product repeats the two-style technical narrative, while its numeric “Color” options do not explain which PCB design is delivered. Check the selected style's physical connectors, pin labels and FLT configuration; the heading's PCM1794 comparison does not change the fitted DAC into a PCM1794.
• DT21 PCM5102 module: a listing specifies one black audio module, DC 5–10 V and digital input labeled GND/LRCK/DATA/BCK with a described 3.5 mm output. Its only visible variant is “NONE” under a brand-name option, not a selectable converter model. That selection does not mean a PCM1794 or an ES9023 is included.
• Single black PCM5102 assembled module: another product's default description describes PCM5102 and one “black” color option. Its generic catalog attributes mention USB Type-A, balanced output and 44.1 kHz/16-bit while the detailed description instead specifies an I2S header, 3.5 mm audio interface and a much wider claimed rate. These statements conflict; verify the actual board's connectors and fitted chip before relying on the generic USB/balanced claims. An I2S board cannot be presumed to have a USB input or true balanced analog output.
• Raspberry Pi pHAT PCM5102 board: the separate pHAT listing says 24-bit/192 kHz from the Pi's 2 × 20 GPIO I2S interface and a soldered stereo 3.5 mm line-out jack. Its only variant is Default Title. Match Pi header orientation, compatible host generation, overlay/driver and line-level downstream input; a line jack is not proof of a headphone amplifier.
• Default-title 48 × 48 mm PCM5102 board: one more product describes DC 5–10 V, manual I2S/left-justified selection, FLT normal/low-delay setting, one assembled board and a seller warning that BCK and DATA labels may be reversed. That warning is product-specific and signals the need to inspect this particular PCB; do not swap those signals blindly on other variants or without confirming the chosen board revision.

PCM1794 versus PCM5102: comparison is not substitution

PCM1794 and PCM5102 refer to different DAC device families. The board-level power rails, serial-interface details, pin assignments, analog-output topology, required filtering and downstream stage cannot be inferred to match merely because both are audio converters. No currently described choice here establishes a PCM1794 package or PCM1794-compatible footprint. A PCM5102 module advertised as “beyond PCM1794” is a seller's qualitative comparison, not evidence of a measured superiority test, benchmark methodology, drop-in replacement or the presence of a PCM1794 chip.

For a PCB repair, first inspect the full part marking of the original device, package and board revision. A loose replacement IC must match the actual footprint and circuit requirements; an assembled PCM5102 breakout will not directly replace a PCM1794 surface-mount chip. For a new audio project, compare the required serial format, clocking, supply architecture, analog stage and verified measurement conditions, then select an appropriate complete module or engineered board. “ES9023” also appears only in comparisons in these product titles. Do not interpret the name as an included ES9023 chip or an assured interchangeable analog output.

Digital serial audio: timing, format and clock checks

I2S commonly uses BCK (bit clock), LRCK (left/right word clock) and DATA; boards may label LRCK as WS. Left-justified data places its bits differently relative to the word-select transition than conventional I2S. The product descriptions claim manual switching between these formats on some boards. Set the upstream source and selected DAC board to the same word length, frame timing, channel order and serial format; otherwise noise, silence or shifted audio can result despite apparently correct wires. Check the actual PCB markings and documentation because one seller explicitly warns that BCK and DATA silkscreen labels may be reversed on its board. That is not a universal pin mapping for PCM5102 modules.

A module description says the board derives its internal master timing with the DAC's PLL without an external MCLK connection. That statement applies to the particular design described and does not guarantee that every PCM5102 board on this page accepts any arbitrary clock ratio or jitter condition. PLL clock generation does not upsample source material or increase its underlying sampling frequency. Validate the digital source's BCK/LRCK relationship and data format against the actual DAC chip and PCB revision. A 384 kHz headline gives a claimed maximum accepted format for certain products, not a guarantee that a particular Arduino board, Raspberry Pi driver, digital source or software path can deliver it.

Power and analog-output engineering

Several assembled-board listings specify DC 5–10 V at their VCC/GND board pins and warn about reversed polarity or exceeding the limit. This is a board-level statement, not the operating voltage of a naked PCM5102 IC or a universal supply for Raspberry Pi pHATs. A Pi GPIO connection may expose a different power domain. Verify the selected board's regulator, polarity, current demand and ground scheme from its actual board documentation. Avoid connecting an unidentified supply merely because another listing on this page says 5–10 V.

Likewise, a claimed 2.1 V RMS analog output describes a seller's particular board and test condition, not a guaranteed voltage across every connector or load. Separate line-level output from headphone-drive capability: some style descriptions say a 3.5 mm headphone socket was added, but the presence of a socket alone does not establish a dedicated amplifier, output impedance, supported headphone load or safe volume. The Pi pHAT explicitly calls its 3.5 mm jack a stereo line output; connect it to a suitable line input unless the selected board's documentation separately confirms a headphone stage. “Balanced Out” in a generic attribute must not override the need to verify actual differential output wiring and connectors.

Published 112 dB SNR and −93 dB distortion are not comparable without matching signal level, bandwidth, weighting, load, power, test equipment and board layout. No measurement report or verified PCM1794-versus-PCM5102 test accompanies these listings. Subjective claims such as “better bass,” “no burrs” and “surpassing ES9023” are not technical acceptance criteria. For an engineered playback chain, request the exact board revision, topology and measured noise/distortion at the intended output load if those figures matter.

Selection checklist for an audio build

1. Identify the converter: if PCM1794 is mandatory, do not infer it from this collection name or a comparison in a listing heading. Check the selected product's chip marking. The current described options identify PCM5102 boards.
2. Choose the physical host: a 2 × 20 Raspberry Pi pHAT, a generic I2S breakout and a single DAC IC are different delivery formats. Check space, header orientation, board size, mounting and enclosure clearance.
3. Confirm input protocol: distinguish an I2S header from USB or analog inputs, choose I2S versus left-justified mode where available, and verify BCK/LRCK/DATA labeling on the exact board before connection.
4. Plan the analog destination: check whether the chosen variant provides a line jack, other analog connection or an actually specified headphone driver. Confirm downstream input level, load and grounding.
5. Check exact supply: apply the selected board's own voltage/polarity instructions and verify whether a Pi-oriented pHAT draws power from the host. Do not transfer a 5–10 V supply rule across unrelated layouts.
6. Read variant meaning: A/B/C and 01/02/03 are offered as styles under “Color” without a complete mapping in the descriptions; black and “NONE” choices do not choose a different silicon family; Default Title means no alternate option is shown, not a PCM1794 upgrade.

These are conversion-board choices for a digitally sourced stereo audio project, not a collection of verified PCM1794 chips. Product membership and availability remain as listed. Match the actual selected board and its documentation to the host, audio format and output stage instead of relying on comparison words in the title.