Overview
The PCM2902CDB is a stereo audio codec produced by Texas Instruments, designed to integrate USB, S/PDIF, and high-quality audio conversion capabilities into a single chip. This device is part of the PCM2900/2902 series and is distinguished by its inclusion of S/PDIF (Sony/Philips Digital Interface Format). The PCM2902CDB features a USB-compliant full-speed protocol controller, requiring no software code for operation, and employs TI's SpAct architecture to recover the audio clock from USB packet data, ensuring low clock jitter and independent playback and record sampling rates.
Key Specifications
| Parameter | Value |
|---|---|
| Package | 28-Pin SSOP (DB) |
| Operating Temperature Range | -25°C to 85°C |
| ADC Resolution | 16-bit Delta-Sigma |
| ADC Sampling Rates | 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz |
| DAC Resolution | 16-bit Delta-Sigma |
| DAC Sampling Rates | 32 kHz, 44.1 kHz, 48 kHz |
| USB Interface | Full-Speed Transceivers, USB 2.0 Compliant, Certified by USB-IF |
| Power Supply | 5 V Typical (VBUS) |
| ADC Analog Performance (at VBUS = 5 V) | THD+N = 0.01%, SNR = 89 dB, Dynamic Range = 89 dB |
| DAC Analog Performance (at VBUS = 5 V) | THD+N = 0.005%, SNR = 96 dB, Dynamic Range = 93 dB |
| Clock Source | On-Chip Clock Generator with Single 12-MHz Clock Source |
Key Features
- On-Chip USB Interface: Full-Speed Transceivers, fully compliant with USB 2.0 specification, certified by USB-IF, partially programmable descriptors, USB adaptive mode for playback, and USB asynchronous mode for record.
- S/PDIF Interface: Available on the PCM2902C model, enabling digital audio transmission.
- High-Quality Audio Conversion: 16-bit Delta-Sigma ADC and DAC with various sampling rates up to 48 kHz.
- Analog Performance: Low THD+N and high SNR and dynamic range for both ADC and DAC.
- Human Interface Device (HID) Function: Volume and mute controls, suspend flag function.
- SpAct Architecture: Enables playback and record with low clock jitter and independent sampling rates.
- Single Power Supply: 5 V typical (VBUS).
Applications
- USB Audio Speaker Systems: Ideal for integrating high-quality audio into speaker systems connected via USB.
- USB Headsets: Suitable for headsets requiring clear and reliable audio transmission.
- USB Monitors: Can be used in monitor systems to enhance audio quality.
- USB Audio Interface Boxes: Useful for converting analog audio signals to digital and vice versa over USB.
Q & A
- What is the primary function of the PCM2902CDB?
The PCM2902CDB is a stereo audio codec that integrates USB, S/PDIF, and high-quality audio conversion capabilities into a single chip.
- What is the difference between PCM2900C and PCM2902C?
The PCM2902C includes S/PDIF, while the PCM2900C does not.
- What are the supported sampling rates for the ADC and DAC?
The ADC supports sampling rates of 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, and 48 kHz. The DAC supports sampling rates of 32 kHz, 44.1 kHz, and 48 kHz.
- Is the PCM2902CDB USB compliant?
Yes, the PCM2902CDB is fully compliant with the USB 2.0 specification and certified by USB-IF.
- What is the power supply requirement for the PCM2902CDB?
The device operates on a single 5 V power supply (VBUS).
- What is the significance of SpAct architecture in the PCM2902CDB?
The SpAct architecture enables the recovery of the audio clock from USB packet data, ensuring low clock jitter and independent playback and record sampling rates.
- Does the PCM2902CDB require software code for operation?
No, the USB protocol controller does not require software code for operation, although some USB descriptors can be modified.
- What are the analog performance metrics for the ADC and DAC?
The ADC has a THD+N of 0.01%, SNR of 89 dB, and dynamic range of 89 dB. The DAC has a THD+N of 0.005%, SNR of 96 dB, and dynamic range of 93 dB.
- What is the package type and pin count of the PCM2902CDB?
The PCM2902CDB comes in a 28-pin SSOP (DB) package.
- What are some common applications of the PCM2902CDB?
Common applications include USB audio speaker systems, headsets, monitors, and audio interface boxes.
