Overview
The PCM2705CDBR, produced by Texas Instruments, is a single-chip USB stereo audio digital-to-analog converter (DAC) with a USB-compliant full-speed protocol controller and S/PDIF output. This device is part of the PCM270x series, known for its integrated USB interface and high-quality audio performance. The PCM2705CDBR does not require a dedicated device driver, making it a convenient solution for various audio applications. It employs TI's unique SpAct™ architecture, which recovers the audio clock from USB packet data, ensuring low clock jitter and high audio fidelity.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | 28-Pin SSOP | |
| USB Compliance | USB 1.1 Specification, Full-Speed | |
| Sampling Rates | 32 kHz, 44.1 kHz, 48 kHz | |
| Power Supply | Bus-Powered: 5 V, Self-Powered: 3.3 V | V |
| Analog Performance (Bus-Powered) | THD+N: 0.006% (RL > 10 kΩ), SNR: 98 dB, Dynamic Range: 98 dB | % / dB |
| Analog Performance (Self-Powered) | THD+N: 0.025% (RL = 32 Ω), SNR: 98 dB, Dynamic Range: 98 dB | % / dB |
| Operating Temperature | -25°C to 85°C | °C |
| Digital Input Clock Frequency | 11.994 MHz to 12.006 MHz | MHz |
| Analog Output Load Resistance | 16 Ω to 32 Ω | Ω |
Key Features
- No dedicated device driver needed
- On-chip USB interface with full-speed transceivers
- Adaptive isochronous transfer for playback
- Bus-powered or self-powered operation
- On-chip clock generator with a single 12-MHz clock source
- 16-bit delta-sigma stereo DAC
- S/PDIF output and single-ended headphone output
- Up to eight Human Interface Device (HID) interfaces (model and setting dependent)
- Suspend flag for power management
- SpAct™ architecture for low clock jitter
Applications
- USB audio interface boxes
- USB headphones and speakers
- USB CRT/LCD monitors with audio
- Consumer audio products with USB features
- Audio playback devices requiring high-quality digital-to-analog conversion
Q & A
- What is the package type of the PCM2705CDBR?
The PCM2705CDBR comes in a 28-Pin SSOP package.
- Does the PCM2705CDBR require a dedicated device driver?
No, the PCM2705CDBR does not require a dedicated device driver.
- What are the supported sampling rates for the PCM2705CDBR?
The supported sampling rates are 32 kHz, 44.1 kHz, and 48 kHz.
- Can the PCM2705CDBR operate in both bus-powered and self-powered modes?
- What is the analog performance of the PCM2705CDBR in terms of THD+N and SNR?
In bus-powered mode, THD+N is 0.006% (RL > 10 kΩ) and SNR is 98 dB. In self-powered mode, THD+N is 0.025% (RL = 32 Ω) and SNR is 98 dB.
- What is the operating temperature range for the PCM2705CDBR?
The operating temperature range is -25°C to 85°C.
- Does the PCM2705CDBR support S/PDIF output?
- What is the purpose of the SpAct™ architecture in the PCM2705CDBR?
The SpAct™ architecture recovers the audio clock from USB packet data, ensuring low clock jitter and high audio fidelity.
- Can the PCM2705CDBR be used in consumer audio products?
- How many HID interfaces does the PCM2705CDBR support?
The PCM2705CDBR supports up to eight Human Interface Device (HID) interfaces, depending on the model and settings.
