HiFiBerry DAC+ ADC Pro

The HiFiBerry DAC+ ADC Pro combines the well-known DAC+ Pro with an analogue input. Both input and output support sample rates up to 192kHz.

It's is a high-resolution digital-to-analogue and analogue-to-digital converter for the Raspberry Pi (newer models with 40 pin GPIO connector).

Note: This board will not fit inside the HighPi case range due to the headphone connector.

The Pro model is an upgrade of the standard version with the following features

• Low-jitter dual-domain clock for optimised clock decoupling from the Raspberry Pi
• Mic bias voltage for the use with electret microphones
• No anti-aliasing filter in the input path for best recording bandwidth

This is a special sound card for the Raspberry Pi, optimised for one specific use case: the best audio playback and recording quality! It is specifically designed for applications that do not only need playback but also recording functionalities.

60W Class-D Amplifier add-on now available!

Features

• Stereo input and output
• Dedicated 192kHz/24bit high-quality Burr-Brown DAC
• Dedicated 192kHz/24bit high-quality Burr-Brown ADC
• Hardware volume control for DAC and ADC. You can control the input and output parameters using “alsamixer” or any application that supports ALSA mixer controls.
• Connects directly to the Raspberry Pi, no additional cables needed
• No soldering - Comes as a pre-fabricated kit.
• Compatible with all Raspberry Pi models with a 40-pin GPIO connector
• Directly powered from the Raspberry Pi, no additional power supply
• Three ultra-low-noise linear voltage regulators for optimal audio performance
• Pro: Low-jitter dual-domain clock for optimised clock decoupling from the Raspberry Pi
• Pro: Mic bias voltage for the use with electret microphones
• Pro: No anti-aliasing filter in the input path for best recording bandwidth
• HAT compliant, EEPROM for automatic configuration
• Gold plated RCA output connectors
• Comes with all components required to mount it. We include 4 M2.5x12mm spacers to fix the board onto the Raspberry Pi

Specification

Balanced/un-balanced input connector J4

This 6-pin connector can be used to connect a balanced input (e.g. XLR or 6.5mm jacks). Pin 1 is on the left bottom corner.

Output connector P5

This connector can be used to connect to external components, e.g. an amplifier. The output is connected in parallel to the RCA jacks. Pin 1 is on the top left.

Configuration

To support the DAC+ ADC, a Raspberry Pi Linux kernel of at least version 4.19.60 is required. Have a look at the documentation on how to update the Linux kernel.

Overlay for config.txt:
dtoverlay=hifiberry-dacplusadcpro

If you’re still using an older Linux kernel that does not support the DAC+ ADC, you can still use the output-part of the DAC+ ADC using the HiFiBerry DAC+ driver:
dtoverlay=hifiberry-dacplus

Resources

• Datasheet
• Updating the Linux kernel
• Use dynamic microphones
• 3D model (step)

Notes

• You may need to update your Linux kernel to support the audio input features (at least Raspberry Pi kernel 4.19.60)
• Note that the actual board received might look different from the images. Layout and components may change without notice. HiFiBerry does not guarantee a specific PCB layout or specific components.