Overview
The PCM2704CDBR is a single-chip USB stereo audio digital-to-analog converter (DAC) produced by Texas Instruments. This component integrates a USB 2.0 compliant full-speed protocol controller and supports S/PDIF output. It is designed to operate without the need for dedicated device driver software, making it a convenient solution for various audio applications. The PCM2704CDBR employs TI's SpAct architecture, which recovers the audio clock from USB packet data, ensuring low clock jitter during playback.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | SSOP (DB) | - |
| Pins | 28 | - |
| Operating Temperature Range | -25 to 85 | °C |
| Sampling Rates | 32 kHz, 44.1 kHz, 48 kHz | - |
| Power Supply | Bus-Powered: 5 V, Self-Powered: 3.3 V | V |
| THD + N (RL > 10 kΩ, Self-Powered) | 0.006% | - |
| THD + N (RL = 32 Ω) | 0.025% | - |
| SNR | 98 dB | - |
| Dynamic Range | 98 dB | - |
| Output Power (RL = 32 Ω) | 12 mW | - |
| Passband Ripple | ±0.04 dB | - |
| Stop-Band Attenuation | -50 dB | - |
Key Features
- On-Chip USB Interface with full-speed transceivers, fully compliant with USB 2.0 specification and certified by USB-IF.
- No dedicated device driver needed; partially programmable descriptors.
- Bus-powered or self-powered operation with single power supply options.
- On-chip clock generator with a single 12-MHz clock source.
- 16-Bit Delta-Sigma Stereo DAC with high analog performance: THD + N of 0.006% (RL > 10 kΩ, self-powered) and SNR of 98 dB.
- Oversampling digital filter with passband ripple of ±0.04 dB and stop-band attenuation of -50 dB.
- S/PDIF output with SCMS and external ROM interface (for PCM2704C and PCM2706C).
- Up to eight Human Interface Device (HID) interfaces (model and setting dependent).
Applications
- USB headphones and audio speakers.
- USB CRT/LCD monitors with audio capabilities.
- USB audio interface boxes.
- Consumer audio products featuring USB connectivity.
Q & A
- What is the package type of the PCM2704CDBR? The PCM2704CDBR comes in a 28-pin SSOP (DB) package.
- What are the supported sampling rates for the PCM2704CDBR? The supported sampling rates are 32 kHz, 44.1 kHz, and 48 kHz.
- Does the PCM2704CDBR require a dedicated device driver? No, it does not require a dedicated device driver.
- What are the power supply options for the PCM2704CDBR? It can operate as bus-powered (5 V) or self-powered (3.3 V).
- What is the SNR of the PCM2704CDBR? The Signal-to-Noise Ratio (SNR) is 98 dB.
- Does the PCM2704CDBR support S/PDIF output? Yes, it supports S/PDIF output with SCMS.
- Can the PCM2704CDBR be used in self-powered mode? Yes, it can operate in both bus-powered and self-powered modes.
- What is the typical output power of the PCM2704CDBR? The typical output power is 12 mW at a load resistance of 32 Ω.
- Does the PCM2704CDBR support HID interfaces? Yes, it supports up to eight Human Interface Device (HID) interfaces.
- What is the operating temperature range of the PCM2704CDBR? The operating temperature range is -25°C to 85°C.
