Item specifics
Description
PCM1808 Module Product Overview
The PCM1808 audio stereo ADC module is high‑performance PCM1808 chip, a low‑cost, single‑chip stereo analog‑to‑digital converter. It converts single‑ended analog audio signals into 24‑bit digital I2S data streams, making it ideal for digitizing microphone, line‑in, and other analog sources. The device features a delta‑sigma modulator (64× oversampling), a digital decimation filter, and a high‑pass filter that eliminates DC components. It supports master/slave modes and two data formats (I2S and left‑justified) with sample rates up to 96kHz. It is widely used in audio capture, USB sound cards, recording equipment, and digital audio processors.
PCM1808 Module Core Features
The PCM1808 is a 24‑bit delta‑sigma stereo ADC with 3Vp‑p single‑ended analog inputs, eliminating the need for differential drive circuitry. It achieves a typical THD+N of -93dB, SNR of 99dB, and dynamic range of 99dB, delivering high‑quality audio digitisation.
The built‑in digital decimation filter has a 64× oversampling ratio, pass‑band ripple of ±0.05dB, and stop‑band attenuation of -65dB. The on‑chip high‑pass filter has a cut‑off frequency of only 0.91Hz at 48kHz, effectively removing DC offsets. An analog anti‑aliasing low‑pass filter is also integrated, simplifying external circuit design.
The PCM1808 supports flexible PCM audio interfaces: master or slave mode, data formats of 24‑bit I2S or 24‑bit left‑justified, sample rates from 8kHz to 96kHz, and system clock ratios of 256fs, 384fs, or 512fs. It supports power‑down and reset by suspending the system clock to save power.
The module uses dual power supplies: 5V for analog and 3.3V for digital sections. It outputs standard I2S signals (BCK, LCK, DATA) that can directly connect to microcontrollers, DSPs, or FPGAs. The compact PCB size facilitates easy integration.
PCM1808 Module Applications
The PCM1808 module is ideal for audio capture and recording devices (USB microphones, recorders, sound cards), digital audio processors, musical instrument effects, voice recognition front‑ends, industrial audio monitoring, broadcast equipment, and teaching experiments that require analog‑to‑digital audio conversion.
PCM1808 Module Key Advantages
The PCM1808 offers high‑performance stereo ADC conversion at a low cost. With 24‑bit resolution, 99dB SNR, and -93dB THD+N, it meets the requirements of both consumer and professional audio capture. The single‑ended analog input simplifies front‑end analog design and reduces BOM cost.
Integrated anti‑aliasing LPF and high‑pass filter (0.91Hz at 48kHz) minimise external components while ensuring signal purity. Master/slave mode flexibility adapts to various system clock configurations, seamlessly connecting to any I2S host.
Separate 5V analog and 3.3V digital power supplies reduce digital noise interference, improving SNR. The compact form factor makes it easy to embed in DIY USB sound cards, audio recorders, and digital audio processors.
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FAQ:
What is the PCM1808 audio ADC module and what is it used for?
The PCM1808 module is a compact stereo analog‑to‑digital converter board based on the Texas Instruments PCM1808 chip. It converts line‑level analog audio signals into a 24‑bit I²S digital stream, making it ideal for adding high‑quality audio input to microcontrollers, DSP systems, and USB audio interfaces. The module supports sampling rates from 8 kHz to 96 kHz and accepts standard single‑ended line‑level inputs.
How do I connect the PCM1808 module to an ESP32 or other I²S‑capable MCU?
Connect the module’s VIN to 5 V (or 3.3 V if your board supplies both rails), GND to GND, and the I²S signals: BCK (bit clock) to the MCU’s I²S‑BCK pin, LRCK (word select / LRCLK) to I²S‑WS pin, and DOUT to I²S‑DIN pin. Some MCUs also require a master clock (MCLK); if your module provides an MCLK output, connect it to the MCU’s MCLK input, or set the PCM1808 to slave mode and generate MCLK externally. Always keep wiring short to avoid glitches.
Does the PCM1808 module need a master clock (MCLK)? How do I configure it?
The PCM1808 can operate in both master and slave modes. In master mode, the on‑board crystal (typically 12.288 MHz) generates the system clock and the module outputs MCLK, BCK, and LRCK. In slave mode, the external MCU must provide all clocks. Most common modules are pre‑configured for master mode with a 256 fs clock, supporting 96 kHz sampling. Check the module’s schematic or set the FMT pins according to the PCM1808 datasheet to select the desired mode.
What is the maximum sampling rate and bit depth of the PCM1808 module?
The PCM1808 supports 24‑bit audio and sampling rates of 8 kHz, 16 kHz, 32 kHz, 44.1 kHz, 48 kHz, and 96 kHz. It achieves a signal‑to‑noise ratio of 99 dB and a dynamic range of 99 dB. The actual sampling rate depends on the master clock frequency and the configured oversampling ratio. For 96 kHz operation, a 24.576 MHz master clock is required when using 256 fs mode; many modules include a 12.288 MHz crystal, which limits them to 48 kHz maximum. Verify the crystal on your board to know the true maximum rate.
What is the difference between the PCM1808 ADC module and a PCM5102 DAC module? Can I use them together?
The PCM1808 is an ADC (analog‑to‑digital converter) that captures audio into the digital domain, while the PCM5102 is a DAC (digital‑to‑analog converter) that plays digital audio. They are complementary: a PCM1808 can digitize a microphone or line‑in signal, an MCU can process the data, and a PCM5102 can output the result. Both use I²S interfaces, so they can share the same I²S bus if one is set to output and the other to input with proper chip‑select or tristate control.
What kind of audio input does the PCM1808 module accept? Can I connect a dynamic microphone directly?
The module accepts single‑ended line‑level signals with a typical input range of 0.5 Vrms to 1.0 Vrms. It cannot be connected directly to a dynamic microphone or an electret condenser mic without a pre‑amplifier, because these produce much lower voltages. Use a dedicated microphone pre‑amp module (e.g., MAX9814) to boost the mic signal to line level before feeding it to the PCM1808. For consumer audio sources like a CD player or a smartphone headphone jack, you can connect directly via the 3.5 mm input or header pins.
How can I read the I²S data from the PCM1808 using Arduino or ESP32? Is there a ready‑to‑use library?
For ESP32, the built‑in I²S driver (`driver/i2s.h` in ESP‑IDF or the Arduino‑ESP32 I²S library) can directly read the I²S stream from the PCM1808. You configure the I²S peripheral as master with the correct sample rate and bit depth, then read samples into a buffer. For Arduino Uno or other MCUs without a native I²S peripheral, you must use a software I²S library (inefficient) or an external I²S decoder chip. Several open‑source PCM1808 Arduino libraries are available on GitHub; the most reliable approach is to use the ESP32’s I²S driver and write a simple callback.
What power supply does the PCM1808 module require? Can I power it from 3.3 V alone?
The PCM1808 chip requires two supply voltages: 5 V for the analog section (AVDD) and 3.3 V for the digital section (DVDD). Most modules include an on‑board 3.3 V regulator, so you only need to supply 5 V to the VIN pin. If your system only provides 3.3 V, the module will not function because the analog front‑end does not operate at 3.3 V. Always check the module’s pin labels: if both 5 V and 3.3 V pins are present, you can supply them separately for better noise isolation.
Why is my PCM1808 module producing noise, hiss, or distorted audio? How can I improve the recording quality?
Common causes of noise include: (1) a poor‑quality 5 V power supply—use a linear regulator or a low‑noise buck converter; (2) long unshielded wires between the analog source and the module—keep connections short and use shielded cable; (3) ground loops—ensure the audio source and the module share a single low‑impedance ground point; (4) digital noise coupling—place the module away from high‑frequency digital signals. Adding a 10‑100 µF capacitor at the module’s power input and using a clean, regulated supply usually yields the best results.
What are the most common applications of the PCM1808 ADC module?
It is used in DIY USB audio interfaces (with an STM32 or ESP32 acting as the USB bridge), audio spectrum analyzers, digital guitar pedals, voice‑recognition front‑ends, room‑equalization measurement systems, and any project that needs to digitize high‑quality stereo audio. Its simple I²S interface, 24‑bit resolution, and up to 96 kHz sampling make it a popular choice for hobbyist and professional audio projects alike.