Overview
The PCM2904DBG4, produced by Texas Instruments, is a single-chip stereo audio codec with a USB-compliant full-speed protocol controller. This device is part of the PCM2904 and PCM2906 family, with the PCM2904DBG4 specifically being a variant without S/PDIF. It integrates a 16-bit Delta-Sigma ADC and DAC, making it suitable for various audio applications. The codec features an on-chip USB interface, analog low-pass filters, and a clock generator, allowing for independent playback and record sampling rates with low clock jitter. The device is fully compliant with the USB 1.1 specification and includes human interface device (HID) volume and mute controls.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VBUS) | 4.36 to 5.25 | V |
| Operating Temperature | -25 to 85 | °C |
| ADC Resolution | 8, 16 | bits |
| ADC Sampling Frequency | 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz | kHz |
| DAC Sampling Frequency | 32, 44.1, 48 kHz | kHz |
| THD+N (ADC) | 0.01% | % |
| THD+N (DAC) | 0.005% | % |
| SNR (ADC) | 89 dB | dB |
| SNR (DAC) | 96 dB | dB |
| Dynamic Range (ADC) | 89 dB | dB |
| Dynamic Range (DAC) | 93 dB | dB |
| Package | 28-Pin SSOP |
Key Features
- On-chip USB interface with full-speed transceivers and adaptive mode for playback, asynchronous mode for record.
- 16-bit Delta-Sigma ADC and DAC.
- Support for multiple sampling frequencies: 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz for ADC; 32, 44.1, 48 kHz for DAC.
- Human Interface Device (HID) volume and mute controls.
- Certified by USB-IF and compliant with USB 1.1 specification.
- Single power supply: 5 V typical (VBUS).
- On-chip clock generator with a single 12-MHz clock source.
- Bus powered with suspend mode support.
- Analog low-pass filters and digital decimation/oversampling filters included.
Applications
- USB audio speaker systems.
- USB headsets.
- USB monitor speakers.
- USB audio interface boxes.
- Other USB-based audio devices requiring high-quality audio conversion.
Q & A
- What is the primary function of the PCM2904DBG4?
The PCM2904DBG4 is a stereo audio codec with a USB interface, designed for converting analog audio signals to digital and vice versa.
- Does the PCM2904DBG4 support S/PDIF?
No, the PCM2904DBG4 does not support S/PDIF. This feature is available in the PCM2906 variant.
- What are the supported sampling frequencies for the ADC and DAC?
The ADC supports sampling frequencies of 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz. The DAC supports 32, 44.1, and 48 kHz.
- Is the PCM2904DBG4 compliant with USB standards?
- What is the typical supply voltage for the PCM2904DBG4?
The typical supply voltage is 5 V (VBUS).
- Does the PCM2904DBG4 have built-in filters?
- What is the package type of the PCM2904DBG4?
The device is packaged in a 28-Pin SSOP.
- What are some common applications of the PCM2904DBG4?
Common applications include USB audio speakers, headsets, monitor speakers, and audio interface boxes.
- How does the device handle clock generation?
The device has an on-chip clock generator that uses a single 12-MHz clock source.
- Is the PCM2904DBG4 bus powered?
