Analog Devices' Audio Codecs for high-performance portable audio electronics

The ADAU1361 and ADAU1761 audio codecs include stereo audio ADCs (analog-to-digital converters) and DACs (digital-to-analog converters) that support sample rates from 8 kHz to 96 kHz, and a digital volume control. The analog input stage supports a stereo line input, a stereo analog microphone interface, and a circuit to supply the microphone bias voltage. It also supports the new standard in high-performance low-noise, digital microphones.

The analog output stage includes two differential and three single-ended outputs, allowing for the direct connection of stereo headphones, an earpiece and other output transducers. AC-coupled or “capless” configurations are supported for the headphone interface. The differential line outputs can interface to a broad portfolio of ADI’s Class D power amplifiers.

The serial control bus supports the I²C or SPI protocols, while the serial audio bus is programmable for I²S, left/right justified, or TDM modes. A programmable PLL supports flexible clock generation for all standard rates and available master clocks from 8 MHz to 27 MHz.

As part of a complete portable audio signal chain, the ADAU1361 and ADAU1761 interface to any analog microphone or PDM digital microphone, including Analog Devices’ ADMP401 analog and ADMP421 digital MEMs microphones. The codecs also match well with both stereo and mono Class D audio amplifiers from Analog Devices, such as the SSM2315, SSM2317, SSM2306 Class D power amplifiers.