The ADAU1467WBCPZ300 is a digital audio processor from Analog Devices. It is part of the Sigma DSP family, which are designed for audio processing applications such as audio/visual receivers, musical instruments, loudspeakers, mobile devices, and other applications where audio processing is required. Here are its key features:

1.Flexible Audio Processing: The ADAU1467WBCPZ300 provides flexible, powerful audio processing capabilities with its 28-bit audio DSP.

2. Multichannel Audio Input and Output: The device supports multiple audio input and output channels through various digital interfaces, including I'S, TDM, and PDM.

3. Integrated PLL: This on-chip PLL can be used to convert a reference clock with a lower frequency into a high-frequency clock signal.

4. Self-Boot Capability: The device can be programmed to automatically load a program and parameter data from an external EEPROM at power-up, reducing the need for a separate microcontroller.

5. SigmaStudio Graphical Programming: The device is programmed using the SigmaStudio graphical programming tool, which provides a visual programming environment for designing audio processing algorithms.

For the circuit connection, here are some important pins:

- DVD, IOV DD, ADD, PADD: These are the power supply pins for the digital core, I/O, analog, and PLL sections of the device, respectively.

- MPX: These are the MP (miniDSP program) pins, which are used to select one of four programs stored in an external EEPROM during self-boot.

- DATA_In, DATA_Out: These are the serial data input and output pins, respectively. They are used to receiving and send digital audio data.

- Lack, Bulk: These are the word and bit clock pins for the serial audio interfaces.

- ADDX: These are the address pins for the external EEPROM during self-boot.

- SCL, SDA: These are the clock and data lines for the I2C control interface.

The specific application circuit will depend on your specific use case and the audio processing algorithms you want to implement. It's recommended to refer to the data sheet and other technical resources provided by Analog Devices for detailed information on how to connect and use the ADAU1467WBCPZ300 in a circuit. It's also important to take care with the power supply decoupling, grounding, and signal integrity to ensure the best audio performance.