Datasheet DAC+ ADC

Overview

The HiFiBerry DAC+ ADC is a high-resolution digital-to-analog and analog-to-digital converter for the Raspberry Pi (newer models with 40 pin GPIO connector). This is a special sound card for the Raspberry Pi, optimized for one specific use case: the best audio playback quality. It is specifically designed for applications that do not only need playback, but also recording functionalities.

Facts

  • 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. You can control the output volume using “alsamixer” or any application that supports ALSA mixer controls.
  • Connects directly to the Raspberry Pi, no additional cables needed
  • Balanced input supported with optional XLR-connectors
  • No soldering, comes as a pre-fabricated kit. You just plug it onto the Raspberry Pi, it is conform to the Raspberry Pi hardware-attached-on-top (HAT) specification.
  • 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
  • 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
  • Audio input requires updated Linux kernel

Hardware

Note that the actual board might look a bit different. Layout and components might change without further notice. We do not guarantee a specific PCB layout or specific components.

Connectors and Jumpers

1Analogue input, phone jack 3.5mm
2Analogue output RCA
3Analogue output (p5)
4Input configuration jumper (J1)
5Connector for balanced input (P6)

Balanced input connector P6

This 5-pin connector can be used to connect a balanced input (e.g. XLR or 6.5mm jacks). Pin 1 is on the left.

1right +
2right –
3GND
4left –
5left +

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.

1+5V
2left
3GND
4GND
5+5V
6right

Input gain settings

The jumper block is used to configure the input stage. In most cases it is recommended to the the default setting without additional input gain. 32db gain can be used to connect dynamic microphones.
Jumpers are numbered from top to the bottom.

1234function
1000 db gain
01112db gain
01032 db gain

Specifications

Maximum input voltage2.1Vrms4.2Vrms for balanced input
Maximum output voltage2.1Vrms
ADC signal-to-noise ratio110dbtypical
DAC signal-to-noise ratio112dbtypical
ADC THD+N-93dbtypical
DAC THD+N-93dbtypical
Input voltage for lowest distortions0.8Vrmstypical
Input gain (configurable with Jumpers)0dB, 12dB, 32dB
Power consumption<0.3W
Sample rates44.1-192kHz

Configuration

To support the DAC+ ADC, a Raspberry Pi Linux kernel of at least version 4.18.12 is required. Have a look at the documentation how to update the Linux kernel.

Overlay for config.txt:
dtoverlay=hifiberry-dacplusadc

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

Media

Additional documentation