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

Specifications

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

• 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.

Package Contents

• 1x HiFiBerry DAC+ ADC Pro