Overview
The PCM2904DB, produced by Texas Instruments, is a single-chip USB stereo audio codec that integrates a USB-compliant full-speed protocol controller. This device is part of the PCM2904/2906 series, with the PCM2904DB specifically lacking the S/PDIF feature present in the PCM2906. The PCM2904DB employs TI's SpAct™ architecture, which enables the recovery of the audio clock from USB packet data, ensuring low clock jitter and independent playback and record sampling rates.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage (VBUS) | 4.36 to 5.25 | V |
| ADC Resolution | 16-bit | |
| DAC Resolution | 16-bit | |
| ADC Sampling Rates | 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz | |
| DAC Sampling Rates | 32, 44.1, 48 kHz | |
| THD+N (ADC) | 0.01% | |
| THD+N (DAC) | 0.005% | |
| SNR (ADC) | 89 dB | |
| SNR (DAC) | 96 dB | |
| Dynamic Range (ADC) | 89 dB | |
| Dynamic Range (DAC) | 93 dB | |
| Package | 28-Pin SSOP | |
| Operating Temperature | -25 to 85°C |
Key Features
- On-Chip USB Interface with Full-Speed Transceivers, fully compliant with USB 1.1 specification and certified by USB-IF.
- Partially programmable descriptors.
- USB Adaptive Mode for playback and USB Asynchronous Mode for record.
- Bus powered with a single 5 V power supply.
- On-Chip Clock Generator with a single 12-MHz clock source.
- Stereo ADC and DAC with integrated analog filters (antialiasing and low-pass filters).
- Human Interface Device (HID) volume and mute control.
- Suspend flag for power management.
- SpAct™ architecture for low clock jitter and independent playback and record sampling rates.
Applications
- USB Audio Speakers
- USB Headsets
- USB Monitors
- USB Audio Interface Boxes
Q & A
- What is the primary function of the PCM2904DB?
The PCM2904DB is a single-chip USB stereo audio codec that integrates a USB-compliant full-speed protocol controller.
- Does the PCM2904DB support S/PDIF?
No, the PCM2904DB does not support S/PDIF. This feature is available in the PCM2906 model.
- What are the supported sampling rates for the ADC and DAC?
The ADC supports sampling rates of 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz. The DAC supports sampling rates of 32, 44.1, and 48 kHz.
- What is the resolution of the ADC and DAC?
Both the ADC and DAC have a resolution of 16 bits.
- What is the typical supply voltage for the PCM2904DB?
The typical supply voltage is 5 V.
- Does the PCM2904DB support HID controls?
- What is the package type of the PCM2904DB?
The package type is a 28-Pin SSOP.
- What are the operating temperature ranges for the PCM2904DB?
The operating temperature range is -25 to 85°C.
- Is the PCM2904DB bus powered?
- What is the SpAct™ architecture used in the PCM2904DB?
The SpAct™ architecture is TI's unique system that recovers the audio clock from USB packet data, enabling low clock jitter and independent playback and record sampling rates.
