Overview
The PCM2900CDB is a single-chip, USB, stereo audio codec produced by Texas Instruments. This component integrates a USB-compliant full-speed protocol controller and is designed for various audio applications. The PCM2900CDB does not include S/PDIF, distinguishing it from the PCM2902C model which does. It 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 | Description | Value |
|---|---|---|
| Package | 28-Pin SSOP (DB) | |
| Operating Temperature Range | °C | -25 to 85 |
| Supply Voltage | V | 5 V (Typical, VBUS) |
| ADC Resolution | Bits | 8, 16 |
| ADC Sampling Frequency | kHz | 8, 11.025, 16, 22.05, 32, 44.1, 48 |
| DAC Resolution | Bits | 8, 16 |
| DAC Sampling Frequency | kHz | 32, 44.1, 48 |
| ADC THD+N | % | 0.01% |
| ADC SNR | dB | 89 dB |
| ADC Dynamic Range | dB | 89 dB |
| DAC THD+N | % | 0.005% |
| DAC SNR | dB | 96 dB |
| DAC Dynamic Range | dB | 93 dB |
| USB Compliance | USB 2.0 Specification, Full-Speed Transceivers | |
| Clock Source | MHz | Single 12-MHz Clock Source |
Key Features
- On-Chip USB Interface: Fully compliant with USB 2.0 Specification, certified by USB-IF, with full-speed transceivers.
- Audio Conversion: 16-Bit Delta-Sigma ADC and DAC.
- Sampling Rates: ADC: 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz; DAC: 32 kHz, 44.1 kHz, 48 kHz.
- Analog Performance: ADC: THD+N = 0.01%, SNR = 89 dB, Dynamic Range = 89 dB; DAC: THD+N = 0.005%, SNR = 96 dB, Dynamic Range = 93 dB.
- Filters and PLLs: Decimation digital filter for ADC, oversampling digital filter for DAC, and on-chip analog PLLs with SpAct architecture.
- Human Interface Device (HID) Function: Volume and mute controls, suspend flag function.
- Power Supply: Single power supply, 5 V typical (VBUS), bus powered.
- Package: 28-Pin SSOP (DB) package.
Applications
- USB Audio Speaker: Ideal for audio speakers connected via USB.
- USB Headset: Suitable for headsets requiring high-quality audio conversion.
- USB Monitor: Used in monitors with integrated audio capabilities.
- USB Audio Interface Box: For external audio interface boxes that connect via USB.
Q & A
- What is the primary function of the PCM2900CDB?
The PCM2900CDB is a single-chip, USB, stereo audio codec that integrates a USB-compliant full-speed protocol controller and performs audio conversion.
- What are the key differences between the PCM2900CDB and PCM2902CDB?
The PCM2900CDB does not include S/PDIF, while the PCM2902CDB does include S/PDIF.
- What are the supported sampling rates for the ADC and DAC?
ADC: 8 kHz, 11.025 kHz, 16 kHz, 22.05 kHz, 32 kHz, 44.1 kHz, 48 kHz; DAC: 32 kHz, 44.1 kHz, 48 kHz.
- What is the typical supply voltage for the PCM2900CDB?
The typical supply voltage is 5 V (VBUS).
- Is the PCM2900CDB USB compliant?
Yes, it is fully compliant with the USB 2.0 Specification and certified by USB-IF.
- What kind of filters does the PCM2900CDB have?
The device includes a decimation digital filter for the ADC and an oversampling digital filter for the DAC.
- What is the purpose of the SpAct architecture in the PCM2900CDB?
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 PCM2900CDB support human interface device (HID) functions?
Yes, it supports HID functions such as volume and mute controls, and a suspend flag function.
- What is the package type of the PCM2900CDB?
The package type is a 28-Pin SSOP (DB).
- What are some common applications of the PCM2900CDB?
Common applications include USB audio speakers, USB headsets, USB monitors, and USB audio interface boxes.
- What is the operating temperature range of the PCM2900CDB?
The operating temperature range is -25°C to 85°C.
