Overview
The PCM2912APJTR is a single-chip, USB stereo audio CODEC (Coder-Decoder) produced by Texas Instruments. It integrates a USB 2.0-compliant full-speed protocol controller and an analog front-end (AFE) function, making it ideal for various audio applications. The device employs TI's SpAct™ architecture, which recovers the audio clock from USB packet data, ensuring low clock jitter and independent playback and record sampling rates. The PCM2912APJTR is designed for bus-powered operation, using the USB voltage source, and it meets the requirements of the USB 2.0 standard connection.
Key Specifications
| Parameter | Value |
|---|---|
| USB Interface | USB 2.0-compliant, full-speed transceivers |
| ADC/DAC Resolution | 16-bit Delta-Sigma |
| Sampling Rates | 8, 11.025, 16, 22.05, 32, 44.1, 48 kHz |
| Clock Source | Single 6-MHz clock source |
| Analog Performance (VBUS = 5 V) | THD+N: 0.01%, SNR: 92 dB, Dynamic Range: 90 dB |
| Microphone Input | Mono ADC with microphone bias, amplifier, and input PGA |
| Headphone Output | Stereo DAC with headphone output, PO: 13 mW (RL = 32 Ω), PO: 25 mW (RL = 16 Ω) |
| Power Supply | Single 5 V supply (VBUS) |
| Package | 32-Pin TQFP |
| Operating Temperature | -25°C to 70°C |
Key Features
- On-chip USB interface with full-speed transceivers, compliant with USB 2.0 specification and certified by USB-IF.
- Partially programmable USB descriptors and adaptive isochronous transfer for playback and asynchronous isochronous transfer for record.
- 16-bit Delta-Sigma ADC and DAC with high analog performance: THD+N of 0.01%, SNR of 92 dB, and dynamic range of 90 dB.
- Mono microphone input with microphone bias, amplifier, and input PGA.
- Stereo headphone output with sidetone PGA, output PGA, and HP amplifier.
- On-chip clock generator with a single 6-MHz clock source and analog PLLs using SpAct™ architecture.
- Pop/click noise-free operation and multifunction status flags for suspend, playback, and record.
Applications
- USB Headset
- USB Headphone
- USB Speaker
- USB Featured Consumer Audio Products
- USB Audio Interface Box
- USB Monitor
- Video Conference System
Q & A
- What is the primary function of the PCM2912APJTR?
The PCM2912APJTR is a single-chip, USB stereo audio CODEC with a USB 2.0-compliant full-speed protocol controller and an analog front-end function.
- What are the supported sampling rates for the PCM2912APJTR?
The supported sampling rates are 8, 11.025, 16, 22.05, 32, 44.1, and 48 kHz.
- What is the analog performance of the PCM2912APJTR at VBUS = 5 V?
The analog performance includes THD+N of 0.01%, SNR of 92 dB, and a dynamic range of 90 dB.
- Does the PCM2912APJTR require external clock sources?
The device can use an external 6-MHz clock source or generate it internally using a built-in crystal resonator.
- What type of package does the PCM2912APJTR come in?
The PCM2912APJTR comes in a 32-Pin TQFP package.
- What are some common applications for the PCM2912APJTR?
Common applications include USB headsets, headphones, speakers, audio interface boxes, monitors, and video conference systems.
- Is the PCM2912APJTR bus-powered?
- What is the operating temperature range for the PCM2912APJTR?
The operating temperature range is -25°C to 70°C.
- Does the PCM2912APJTR support software modification of USB descriptors?
- What is the significance of SpAct™ architecture in the PCM2912APJTR?
The SpAct™ architecture allows the device to recover the audio clock from USB packet data, enabling independent playback and record sampling rates with low clock jitter.
