Overview
The PCM2912A, produced by Texas Instruments, is a single-chip USB stereo audio codec designed for headset applications. It features a USB 2.0-compliant full-speed protocol controller and an analog front-end (AFE) function. The device is bus-powered and operates with a single 5V power supply from the USB bus. It includes a 16-bit Delta-Sigma ADC and DAC, and supports various sampling rates such as 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz. The PCM2912A also incorporates an on-chip clock generator with a single 6-MHz clock source and employs TI’s SpAct™ architecture to recover the audio clock from USB packet data, ensuring low clock jitters.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Resolution | 16 Bits | |
| Sampling Frequency | 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz | |
| THD+N (RL > 10 kΩ) | 0.01% | |
| THD+N (RL = 32 Ω) | 0.02% | |
| SNR | 92 dB | |
| Dynamic Range | 90 dB | |
| Passband Ripple | ±0.1 dB | |
| Stop-Band Attenuation | –43 dB | |
| Supply Voltage (VBUS) | 4.35 - 5.25 V | VDC |
| Operating Temperature | –25 to 70 °C | |
| Package Type | 32-Pin TQFP |
Key Features
- USB 2.0-compliant full-speed protocol controller
- 16-bit Delta-Sigma ADC and DAC
- On-chip clock generator with a single 6-MHz clock source
- SpAct™ architecture for low clock jitters
- Mono ADC with microphone input and microphone amplifier
- Stereo DAC with headphone output
- Sidetone PGA, output PGA, and headphone amplifier
- Antialiasing and analog low-pass filters included
- Digital high-pass filter included
- Bus-powered with suspend mode for low power consumption
- Certified by USB-IF and compliant with USB 2.0 specification
Applications
- USB headsets
- USB headphones
- USB speakers
- USB audio interface boxes
- USB monitors
- Video conference systems
Q & A
- What is the resolution of the PCM2912A ADC and DAC?
The PCM2912A features 16-bit Delta-Sigma ADC and DAC.
- What are the supported sampling rates for the PCM2912A?
The supported sampling rates are 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz.
- What is the THD+N for the PCM2912A with different load resistances?
The THD+N is 0.01% for RL > 10 kΩ and 0.02% for RL = 32 Ω.
- What is the signal-to-noise ratio (SNR) of the PCM2912A?
The SNR is 92 dB.
- What is the dynamic range of the PCM2912A?
The dynamic range is 90 dB.
- What is the passband ripple and stop-band attenuation of the PCM2912A?
The passband ripple is ±0.1 dB, and the stop-band attenuation is –43 dB.
- What is the power supply voltage range for the PCM2912A?
The power supply voltage range is 4.35 to 5.25 VDC.
- What is the operating temperature range for the PCM2912A?
The operating temperature range is –25 to 70 °C.
- What package type is the PCM2912A available in?
The PCM2912A is available in a 32-Pin TQFP package.
- Is the PCM2912A certified by USB-IF?
Yes, the PCM2912A is certified by USB-IF and compliant with the USB 2.0 specification.
