​PI2AES - Pro Audio Shield

IMPORTANT NOTE - All units manufactured after 11/1/2019 require +24V DC Input. Please contact us with any questions regarding this change.

FEATURES
  • RASPBERRY PI 4 COMPATIBLE - Tested on the latest Raspberry Pi 4 using Moode 6.10
  • AES TRANSMITTER – The industry standard WM8804 converts the RPi I2S stream to AES3/SPDIF formatted data at 24-Bit up to 192Khz Frame Rate
  • SPDIF COAX OUTPUT – An RCA connector with Isolation Transformer provides coaxial transmission of the SPDIF Audio Data Stream.
  • SPDIF OPTICAL OUTPUT – Isolated Optical Transmitter Supports Consumer Level DAC and AVR inputs
  • AES BNC OUTPUT - A 75 ohm BNC connector with Isolation Transformer provides for Single Ended AES transmission.
  • AES BALANCED OUTPUT – An RS-422 Transmitter coupled with Isolation Transformer allows the transmission of balanced audio data with 110 ohm impedance via the Professional Audio Standard XLR Connector
  • BUFFERED I2S OUTPUT – Parallel Buffered I2S is available for direct short distance connection to off-board D/A. Perfect for DIY use! I2C for control is also provided as well as 5V Regulated and the Input Voltage Rail
  • DIFFERENTIAL I2S OUTPUT – A DS2063 Differential Transmitter is used to drive the I2S Bus via LVDS over a standard HDMI Connector.
***Standard lead time is 2-3 weeks for all orders***

PI2AES FAQ - Frequently Asked Questions
Q: Do the PI2AES outputs work simultaneously? 
A: Yes, all digital audio outputs deliver the same audio data at the same time. This includes the buffered I2S and I2S over HDMI.

Q: Is the PI2AES compatible with the new Raspberry PI 4?
A: Yes, the PI2AES has been tested on the PI 4 using Moode Audio version 6.10.

Q: Does the PI2AES power the PI?
A: Yes, the PI2AES delivers 5V @ 3A to the PI. A jumper plug (marked PI5V) on the PI2AES allows the power to the PI to be enabled or disabled as desired.

Q: Can I power the PI separate from the PI2AES. 
A: Yes, simply remove the PI5V jumper plug and provide power to the PI via it's usb power input as normal.

Q: What happens if I forget to remove the jumper?
A: Nothing bad! The PI2AES contains a protection circuit that allows both sides to be powered separately. But, Power Supply noise from the PI is somewhat reduced when the jumpier is removed.

Q: What power supply do I need for the PI2AES?
A: The PI2AES is designed to operate with an input voltage 24V (+/- 10%). We sell a High Quality Meanwell 24V @ 1.67A supply specifically for the PI2AES.

Q: Are there two different acrylic cases for the PI4 and PI2/3?
A: The acrylic case we provides has two different right side and front plates for the PI2/3 and PI4. You just assemble which one is appropriate for you. 

Q: What is the purpose of the jumper on pins 13-14 of the 16-pin I2S Header?
A: This jumper enables the internal PI2AES Power Switch. External add-on boards will have their own power on mechanism and this jumper would then be removed.

Q: What pinout is supported by the I2S over HDMI?
A: The pinout conforms to the Gustard DAC pinout. PS Audio support is possible, but the left and right channels will be swapped.

PI2AES GETTING STARTED GUIDE - From the Awesome Folks at SBAF!

Downloads

visio-pi2aes_datasheet_p3.2.pdf
File Size: 853 kb
File Type: pdf
Download File
pi2aes_hw_ref_manual_p3_4.pdf
File Size: 887 kb
File Type: pdf
Download File
pi2aes_step_p3.zip
File Size: 2019 kb
File Type: zip
Download File
pi2aes_jitter_thd_plots.zip
File Size: 1296 kb
File Type: zip
Download File
PI4 and PI3 compatible Acrylic case for PI2AES and PI2AES-AKM DAC option. This includes a rear panel for the PI2AES-RJ45. Please note this is a new version and is not compatible with cases shipped prior to February 20, 2020.
pi2aes-akm_case_p1.zip
File Size: 88 kb
File Type: zip
Download File
 Assembly Instructions for Pi 3/4 compatible Acrylic case for PI2AES and Official Raspberry Pi 7" Display.

pi2aes_7_display_case_assembly.pdf
File Size: 13689 kb
File Type: pdf
Download File
PI2AES Discussion, Hints and Help