Overview
The PCM2904DBR is a stereo audio interface IC from Texas Instruments, designed to integrate USB and analog audio functionalities. This chip is part of the PCM2904/PCM2906 family, which includes models with and without S/PDIF (PCM2906). The PCM2904DBR is packaged in a 28-pin SSOP and is fully compliant with the USB 1.1 specification, making it suitable for various audio applications.
Key Specifications
| Parameter | Unit | Min | Max | |
|---|---|---|---|---|
| Supply Voltage (VBUS) | V | 4.36 | 5 | 5.25 |
| Operating Temperature | °C | -25 | - | 85 |
| ADC Resolution | bits | 8, 16 | - | - |
| ADC Sampling Frequency | kHz | 8, 11.025, 16, 22.05, 32, 44.1, 48 | - | - |
| DAC Resolution | bits | 16 | - | - |
| DAC Sampling Frequency | kHz | 32, 44.1, 48 | - | - |
| THD+N (ADC) | % | 0.01 | 0.02 | - |
| THD+N (DAC) | % | 0.005 | - | - |
| SNR (ADC) | dB | 81 | 89 | - |
| SNR (DAC) | dB | 96 | - | - |
| Dynamic Range (ADC) | dB | 81 | 89 | - |
| Dynamic Range (DAC) | dB | 93 | - | - |
Key Features
- On-chip USB interface with full-speed transceivers, compliant with USB 1.1 specification
- 16-bit delta-sigma ADC and DAC
- Single-ended analog input/output and S/PDIF (for PCM2906)
- Analog low-pass filter and oversampling digital filter included
- Human Interface Device (HID) volume and mute control
- USB adaptive mode for playback and asynchronous mode for record
- Bus-powered with a single 5V supply voltage
- On-chip clock generator with a single 12-MHz clock source
- SpAct™ architecture for low clock jitter and independent playback and record sampling rates
Applications
- USB audio speaker and headset
- USB monitor and audio interface box
- Audio peripherals requiring USB connectivity
- Consumer electronics with integrated audio functions
Q & A
- What is the primary function of the PCM2904DBR?
The PCM2904DBR is a stereo audio interface IC that integrates USB and analog audio functionalities.
- What is the package type of the PCM2904DBR?
The PCM2904DBR is packaged in a 28-pin SSOP.
- Is the PCM2904DBR compliant with any USB standards?
Yes, it is fully compliant with the USB 1.1 specification.
- What are the sampling frequencies supported by the ADC and DAC?
The ADC supports sampling frequencies of 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz. The DAC supports sampling frequencies of 32, 44.1, and 48 kHz.
- What is the typical supply voltage for the PCM2904DBR?
The typical supply voltage is 5 V.
- Does the PCM2904DBR have built-in analog filters?
Yes, it includes analog low-pass filters and oversampling digital filters.
- What is the SpAct™ architecture used in the PCM2904DBR?
The SpAct™ architecture is used to recover the audio clock from USB packet data, enabling low clock jitter and independent playback and record sampling rates.
- Can the PCM2904DBR be used in bus-powered applications?
Yes, it is designed to be bus-powered with a single 5V supply voltage.
- What are some common applications for the PCM2904DBR?
Common applications include USB audio speakers, headsets, monitors, and audio interface boxes.
- Does the PCM2904DBR support HID controls?
Yes, it supports Human Interface Device (HID) volume and mute controls.
