Overview
The PCM2903CDBR, produced by Texas Instruments, is a single-chip, USB-compliant, stereo audio codec. This device integrates a full-speed USB protocol controller, an S/PDIF digital interface, and both analog and digital input/output capabilities. It is self-powered, requiring an external 3.3V voltage source, and supports various sampling rates. The PCM2903CDBR is designed to meet the requirements of the USB 2.0 specification and includes features such as on-chip clock generation and human interface device (HID) controls for volume and mute functions.
Key Specifications
| Parameter | Min | Max | Unit | |
|---|---|---|---|---|
| Supply Voltage (VCCC, VCCP1, VCCP2, VCCX, VDD) | 3 | 3.3 | 3.6 | V |
| Supply Current (ADC, DAC operation) | 54 | 70 | - | mA |
| Supply Current (USB suspend state) | - | - | 250 | μA |
| Operating Temperature Range | -25 | - | 85 | °C |
| ADC Resolution | - | - | 8, 16 | Bits |
| ADC Sampling Frequencies | - | - | 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz | - |
| DAC Resolution | - | - | 8, 16 | Bits |
| DAC Sampling Frequencies | - | - | 32, 44.1, 48 kHz | - |
| SNR (ADC) | 81 | 89 | - | dB |
| SNR (DAC) | 90 | 96 | - | dB |
| THD+N (ADC) | - | 0.01% | 0.02% | - |
| THD+N (DAC) | - | 0.005% | 0.016% | - |
Key Features
- On-chip USB interface compliant with USB 2.0 specification, including full-speed transceivers and adaptive/asynchronous modes for playback and record.
- Single-ended analog input/output and S/PDIF digital interface for input/output data.
- 16-bit Delta-Sigma ADC and DAC with various sampling rates.
- Human Interface Device (HID) function for volume and mute controls.
- On-chip clock generator with a single 12-MHz clock source.
- Analog low-pass filter included.
- Self-powered with a single 3.3V power supply.
- Low power consumption with 54 mA typical during ADC and DAC operation and 250 μA in USB suspend state.
Applications
- USB audio speakers.
- USB headsets.
- USB monitors.
- USB audio interface boxes.
- Other USB audio devices requiring high-quality audio conversion.
Q & A
- What is the typical supply voltage for the PCM2903CDBR?
The typical supply voltage is 3.3V. - What are the supported sampling rates for the ADC and DAC?
The ADC supports sampling rates of 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz. The DAC supports sampling rates of 32, 44.1, and 48 kHz. - Is the PCM2903CDBR compliant with USB standards?
Yes, it is fully compliant with the USB 2.0 specification. - What is the signal-to-noise ratio (SNR) of the ADC and DAC?
The SNR for the ADC is up to 89 dB, and for the DAC, it is up to 96 dB. - Does the PCM2903CDBR have built-in clock generation?
Yes, it has an on-chip clock generator that requires a single 12-MHz clock source. - What is the typical power consumption during ADC and DAC operation?
The typical power consumption is 70 mA. - What is the power consumption in USB suspend state?
The power consumption in USB suspend state is 250 μA. - Does the PCM2903CDBR support HID controls?
Yes, it supports HID controls for volume and mute functions. - What is the package type of the PCM2903CDBR?
The device is available in a 28-pin SSOP package. - What are the typical applications of the PCM2903CDBR?
Typical applications include USB audio speakers, headsets, monitors, and audio interface boxes.
