Datasheet Studio DAC/ADC
Datasheet Studio DAC/ADC
Overview
The HiFiBerry DAC2 ADC Pro 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, 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.
Facts
- Stereo input and output (external connectors only for one channel)
- 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.
- Support for the HiFiBerry DSP add-on
- Connects directly to the Raspberry Pi, no additional cables needed
- 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
- Low-jitter dual-domain clock for optimised clock decoupling from the Raspberry Pi
- HAT compliant, EEPROM for automatic configuration
- XLR/1/4″ combo jack for input, XLR connector for output
- Comes with all components required to mount it. We include 4 M2.5x12mm spacers to fix the board onto the Raspberry Pi
Hardware and connectors
| 1 | analog input (left channel) |
| 2 | analog output (left channel) |
| 3 | analog input (right channel) |
| 4 | analog output (right channel) |
| 5 | header for DSP add-on |
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.
Specifications
| Maximum input voltage | 2.1Vrms unbalanced 4.2Vrms balanced | |
| Maximum output voltage | 2.1Vrms unbalanced 4.2Vrms balanced | |
| 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 |
Configuration
Overlay for config.txt:dtoverlay=hifiberry-dacplusadcpro
Mixer controls
| Name | Function | Comments |
|---|---|---|
| ADC Left Input | Selects the input for the left channel | For on-board (unbalanced) input use VINL1[SE] for balanced input use {VIN1P, VIN1M}[DIFF] |
| ADC Right Input | Selects the input for the right channel | For on-board (unbalanced) input use VINR1[SE] for balanced input use {VIN2P, VIN2M}[DIFF] |
| ADC | Configures the input gain of the analog input | Use low gains for line-level sources like CD players or similar and high gains for inputs like microphones |
| Digital | Main output volume control | This will control the volume of the analog output |
Example: Configure input for balanced input and maximum input gain (e.g. to connect a dynamic microphone)amixer sset "ADC Left Input" "{VIN1P, VIN1M}[DIFF]"
amixer sset ADC 40db
Example: Configure input for onboard input with low gain (e.g. to connect a CD player or similar)amixer sset "ADC Left Input" "VINL1[SE]"
amixer sset ADC 0db
While there are lots of other ALSA mixer control, most of these access internals of the DAC and ADC chips on the board and
should not be changed.
Media
Additional documentation