PCM2906BDB

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PCM2906BDB Application Field and Working Principle

The PCM2906BDB is a single chip CMOS analog-to-digital and digital-to-analog converter (ADC / DAC) combined with an I2S controller. It is designed to replace audio CODECs like the UDA1341, UAJ or AK4554 in portable consumer devices such as MP3 players, digital audio players, portable disc players, digital photo frames and satellite and cable set top boxes. It provides a cost-effective solution for applications that require CD-quality stereo audio.

The PCM2906BDB is an integrated, ultra-low-power mixed signal CMOS product. It integrates a stereo ADC with linear, logarithmic and pulse density modulation formats, a digital microphone interface, a stereo DAC and an I2S controller. Working together, these components create a high-performance, low-power audio solution for consumer electronics. An on-chip volume control and support for a 1x, 2x or 4x over-sampling rate are also available.

The PCM2906BDB is optimized for low-power, low-distortion, low-noise performance. It has a low-power, low-voltage design optimized for operation over the 3.3V supply range. It has a low-noise and low-distortion on-chip voltage regulators, thereby eliminating the need for an external voltage regulator. The on-chip digital audio circuitry is programmable for various sample rates and formats, including PCM, I2S, and TDM. The audio interface supports multiple digital I/Os and eliminates the need for external components.

Working Principle

The PCM2906BDB performs digital-to-analog conversion using a differential current-steering architecture. This architecture allows for the highest dynamic range, best linearity, and lowest noise performance of any data converter at any supply voltage. By using this architecture, the PCM2906BDB is capable of achieving linearity of 0.002 percent in a 10kHz bandwidth. The on-chip voltage regulator delivers low-noise power to the converter, ensuring excellent dynamic range and robust performance.

The ADC of the PCM2906BDB uses a pipeline architecture to achieve high performance. This architecture allows for high linearity with a reduced number of stages. A low-power, low-noise dual-step quantization architecture is used to minimize noise, distortion and channel mistracking. The ADC also features a wide input dynamic range of 0.7V RMS, an A-weighted noise of -99dBV, and THD+N of 0.003 percent.

The DAC of the PCM2906BDB is based on a delta-sigma architecture with an integrated digital interpolation filter. This architecture allows for higher dynamic range and better noise performance than conventional delta-sigma modulators. The DAC features an output voltage range of 0.2 to 3.3V RMS, an A-weighted noise of -90dBV, and THD+N of 0.001 percent.

The PCM2906BDB also features an I2S controller that eliminates the need for additional external components. The controller provides a seamless interface between the audio ADC and DAC, and the external audio system. It supports up to four data sources, and can be used to control multiple audio channels in a single device. It also supports multiple sample-rate modes, clock sync signals, and audio synchronous signals.

In summary, the PCM2906BDB is an integrated, ultra-low-power, mixed signal CMOS product. It features high-performance digital-to-analog and analog-to-digital conversion, as well as a digital microphone interface and an I2S controller. Its low-noise and low-distortion on-chip voltage regulators ensure excellent dynamic range and robust performance. The PCM2906BDB is ideal for a wide range of applications in the consumer electronics space, including portable disc players, digital audio players, digital photo frames and satellite and cable set top boxes.

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