Datasheet Amp100
Datasheet Amp100
Overview
The HiFiBerry Amp100 is a DAC/amplifier combination for alle Raspberry Pi models featuring a 40-pin GPIO header.
Facts
- Stereo DAC with sample rates up to 192kHz/24bit, based on the HiFiBerry DAC2 Pro design
- Up to 2x100W output power output
- Can be extended with the HiFiBerry DSP add-on board
- Onboard TOSLink input/output (requires DSP add-on board)
- Uses a single external power supply 12-30V to power the amplifier and the Raspberry Pi
- No soldering, comes as a pre-fabricated kit, just plug it onto the Raspberry Pi.
- Comes with all components required to mount it.
Hardware and speaker connectors
| 1 | Power input, barell jack |
| 2 | TOSLink input connector (requires DSP add-on, see below for limitations) |
| 3 | Toslink output connector (requires DSP add-on, see below for limitations) |
| 4 | Power connector, screw terminal |
| 5 | DSP I2S output connector |
| 6 | DSP I2S output connector |
| 7 | Right speaker output |
| 8 | Left speaker output |
| 9 | DSP add-on connectors |
| 10 | Power switch jumper – leave this on if you’re not using the power controller |
| 11 | amplifier gain: open = 24dB, closed = 18dB |
L/R outputs can’t be bridged!
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.
Power supply screw terminal
If you connect an external power supply to the power supply screw terminal, you can just connect it to VSW (+) and GND (-) (see print on the PCB). VIN and VSW are needed in combination with the HiFiBerry power controller.
Indicator LEDs
| D1 | fault | Indicates a fault in the output stage, e.g. shortage or overload |
| D3 | clipping | Indicates clipping, meaning, the input signal in higher than the output stage can handle. Slightly glowing is fine. |
Specifications
| Recommended operating voltage | 12-30V | |
| Absolute maximum operating voltage | 32V | |
| Maximum output power | 2x100W | into 4Ohm |
| THD+N | <0.05% | typical, output power 0.1-10W, 0-20kHz |
| Typical output power per channel | 40W | Vsupply=20V, Rspk = 4Ohm, THD+N <1% |
| 60W | Vsupply=24V, Rspk = 4Ohm, THD+N <1% | |
| 100W | Vsupply=30V, Rspk = 4Ohm, THD+N <1% | |
| Maximum output power per channel | 50W | Vsupply=18V, Rspk = 4Ohm, THD+N <10% |
| 75W | Vsupply=24V, Rspk = 4Ohm, THD+N <10% | |
| 110W | Vsupply=30V, Rspk = 4Ohm, THD+N <10% | |
| Sample rates | 44.1-192kHz |
The Amp2 will power the Raspberry Pi. It is powerful enough for any Pi up to the Pi4B. Note that additional hardware drawing lots of power (e.g. hard disks, displays) might require an external power supply.
Configuration
dtoverlay=hifiberry-amp100
Limitations of the TOSLink inputs and outputs
While the Amp100 board comes with onboard TOSLink inputs and outputs their functionality is limited. Please read this document carefully to understand these limitations.
Functionality
With only the Amp100 connected to the Raspberry Pi, both TOSLink input and output have no function. They require the use of the add-on DSP module. The inputs and outputs are directly connected to the inputs and outputs of the DSP on this DSP module.
Limitations
The DSP add-on originally has been designed to process the data stream between the Raspberry Pi and an add-on DAC like the DAC2 HD and DAC2 Pro. While the TOSLink connectors are connected to the DSP they do not work independently of you not only want to process the audio in the DSP, but also forward the audio data to the amplifier outputs. To implement this, the audio data from the Pi are being replaced by the audio data from the TOSLink input. This requires the Pi to deliver audio data to the DSP. If there is no playback on the Pi, the DAC and amplifier on the Amp100 won’t work.
We have created a small program that outputs a dummy data stream on the Pi. It is open source and can be downloaded from Github. There is no individual support for this script from us. You might post in our forum to discuss potential problems with the community.
We recommend the use of the TOSLink inputs/outputs only to users with some understanding of DSP programming as you might have to create your own DSP profile to use them. For a product where TOSLink, DSP, DAC and amplifier are more tighly integrated and easier to use, check out the Beocreate 4-channel amplifier.
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