1681

Overview

The Adafruit Industries LLC Model 1681 is a VS1053B multi-format audio codec chip in a TQFP-48 package (9mm x 9mm). It decodes MP3, AAC, WMA, Ogg Vorbis, FLAC, WAV, and MIDI formats. Encoding supports Ogg Vorbis, IMA ADPCM, and 16-bit PCM from mic/line inputs. The chip features an internal DSP, 16.5 KiB RAM, stereo DAC with headphone driver for 30-ohm loads, and I2S output. Control interfaces include SPI and UART.

Feature Summary

• Multi-format hardware decoding for compressed and lossless audio files
• Built-in MIDI synthesizer supporting General MIDI 1 and SP-MIDI
• Integrated ADC for mono or stereo audio recording
• Flexible clocking via internal PLL multiplier

Applications

• Embedded audio playback systems
• Voice recording modules
• MIDI synthesizers
• Smart speaker cores

Procurement Notes

Verify the specific suffix of the received component against the VLSI Solutions datasheet to confirm pinout compatibility and voltage levels. Ensure the TQFP-48 package matches your PCB footprint exactly. Confirm that the source document explicitly lists the part number as VS1053B to avoid confusion with earlier variants.

Selection Notes

Select this component when the host microcontroller lacks sufficient processing power for real-time software audio decoding. It is suitable for projects requiring simultaneous playback and recording capabilities. Consider the TQFP-48 package constraints if board space is limited. Verify external clock requirements before finalizing the schematic design.

Part Context

This raw chip is intended for custom designs where users require direct integration of audio processing. It differs from breakout boards by excluding support circuitry like level shifters and SD card sockets. It serves as the core engine for embedded audio applications developed by engineers familiar with SPI and I2S protocols.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation. Users must verify pin-to-pin compatibility with other VS105x series chips directly from the manufacturer's official cross-reference documents.

FAQ

Does the VS1053B decode FLAC natively?

Yes, but it requires loading a software plugin into its internal RAM to enable FLAC decoding.

What is the maximum load impedance for the built-in headphone driver?

The stereo earphone driver is capable of driving a 30-ohm load.

Can the chip record audio?

Yes, it can encode audio from mic or line inputs into Ogg Vorbis, IMA ADPCM, or 16-bit PCM formats.