HiFiBerry DAC+ ADC Pro

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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

Maximum input voltage 2.1Vrms 4.2Vrms for balanced input
Maximum output voltage 2.1Vrms
ADC signal-to-noise ratio 110db typical
DAC signal-to-noise ratio 112db typical
ADC THD+N -90db typical
DAC THD+N -93db typical
Frequency response 10Hz-70kHz (-3dB)
Input gain -12db to 32dB
Power consumption <0.3W
Sample rates 44.1-192kHz

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.

in R- 1 2 in R+
GND 3 4 GND
in L+ 5 6 in L-

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.

+5V 1 2 R
GND 3 4 GND
+5V 5 6 L

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

    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.

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