Overview
The PCM2902CDBR is a single-chip USB stereo audio codec produced by Texas Instruments. It features a USB-compliant full-speed protocol controller and includes S/PDIF functionality. The device is designed to operate without the need for software code, utilizing TI's SpAct™ architecture to recover the audio clock from USB packet data. This architecture enables low clock jitter and independent playback and record sampling rates. The PCM2902CDBR is housed in a 28-pin SSOP package and operates on a single 5V power supply.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 28-Pin SSOP |
| Operating Temperature Range | 0°C to 70°C |
| USB Compliance | USB 1.1 and partially compliant with USB 2.0 |
| ADC Resolution | 16 bits |
| ADC Sampling Rates | 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz |
| DAC Resolution | 16 bits |
| DAC Sampling Rates | 32, 44.1, 48 kHz |
| Analog Performance (ADC) | THD+N = 0.01%, SNR = 89 dB, Dynamic Range = 89 dB |
| Analog Performance (DAC) | THD+N = 0.005%, SNR = 96 dB, Dynamic Range = 93 dB |
| Power Supply | Single 5V (VBUS) |
| Power Dissipation | 280-352 mW (active), 1.25 mW (suspend mode) |
Key Features
- On-chip USB interface with full-speed transceivers and certified by USB-IF.
- Partially programmable descriptors for customization.
- USB adaptive mode for playback and asynchronous mode for record.
- Bus powered with suspend flag function.
- 16-bit Delta-Sigma ADC and DAC.
- On-chip clock generator with a single 12-MHz clock source.
- Human Interface Device (HID) functions for volume and mute control.
- S/PDIF input/output (PCM2902C only).
- Analog performance includes decimation digital filter for ADC and oversampling digital filter for DAC.
Applications
- USB Audio Speaker
- USB Headset
- USB Monitor
- USB Audio Interface Box
Q & A
- What is the primary function of the PCM2902CDBR? The PCM2902CDBR is a single-chip USB stereo audio codec with a USB-compliant full-speed protocol controller and S/PDIF functionality.
- What is the package type of the PCM2902CDBR? The PCM2902CDBR is housed in a 28-pin SSOP package.
- 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, while the DAC supports 32, 44.1, and 48 kHz.
- What is the power supply requirement for the PCM2902CDBR? The device operates on a single 5V power supply (VBUS).
- Does the PCM2902CDBR require software code to operate? No, the USB protocol controller works without the need for software code.
- What are the key analog performance metrics for the ADC and DAC? For the ADC: THD+N = 0.01%, SNR = 89 dB, Dynamic Range = 89 dB. For the DAC: THD+N = 0.005%, SNR = 96 dB, Dynamic Range = 93 dB.
- What are the typical applications of the PCM2902CDBR? Typical applications include USB audio speakers, headsets, monitors, and audio interface boxes.
- Does the PCM2902CDBR support HID functions? Yes, it supports Human Interface Device (HID) functions for volume and mute control.
- What is the S/PDIF functionality in the PCM2902CDBR? The PCM2902CDBR includes S/PDIF input/output functionality.
- How does the PCM2902CDBR manage power consumption? The device is bus powered and has a suspend flag function to reduce power consumption during inactive states.
