miniAMP - User Manual
Contents
1. miniAMP USER MANUAL V1 2 Revision Description Date V1 0 User manual Initial version 25 02 2010 V1 1 Updated wiring section 05 05 2010 Updated jumper configuration V1 2 Updated wiring and instructions for 2 1 mode 05 08 2010 Board Diagram The following diagram shows the miniAMP board connectivity Configuration Headers Power Input 12 24VDC CO O positive polarity I2S routing headers PWM output for additional ouput channel Expansion connector J2 Expansion connector J16 Output jumpers 2ch Bridge Tied Load BTL Jumper closed Ach Single Ended SE Jumper open Speaker outputs See wiring configuration below Expansion Connector J16 Pin Description Pin Description 1 n a 2 n a 3 n a 4 n a 5 Ground 6 Ground 7 Ground 8 Ground 9 MCLKIN 10 I2S_DATA_IN18 amp 2 11 I2S_DATA_IN38 amp 4 12 I2S_ DATA_IN5 amp 6 13 I2S_DATA_IN788 14 I2S_IN_LRCLK 15 I2S_IN_BCLK 16 I2S_DATA_OUT1 amp 2 17 I2S_DATA_OUT3 amp 4 18 I2S_DATA_OUT5 amp 6 19 IS2_DATA_OUT7 amp 8 amp 20 12S OUT_LRCLK 21 I2S_OUT_BCLK 2 3 3V 23 n a 24 3 3V 25 GND 26 GND 27 n a 28 n a miniAMP Basics Before going any further let s summarize a couple of key points of the miniAMP miniAMP is a Full Digital amplifier module taking its signal from an I2S bus In other words no more potential ground loops Your signal is digital all the way to the outputs of the amplifier _miniAMP can be configured in 2ch 2x20W 8Q or2. 2 1 Output jumpers 2ch mode All Closed 4ch mode All Open 2 1ch mode ch1 amp 2 Open ch 3 amp 4 closed Standoffs for board to board connection Bottom board standoff is secured with a bolt Factory default configuration 2ch mode BTL Gain 3dB Power Down All output connectors on the same side In other words if you want the miniAMP module to receive the plug in output from the miniDSP kit processed audio post filtering and crossover you will need to select either I2S_Data_Out1 amp 2 or 12S Data_Out3 amp 4 in a 2ch mode configuration or both if a 4ch mode configuration Here is a zoomed up version of the 12S routing and configuration header for the miniAMP 4ch mode SE Gain 3dB 2 1ch mode BTL SE Gain 3dB Power Down Power Down I2S Routing Headers for selection of which 12S channel gets amplified Jumpers always closed for I2S clocks Do not remove Jumper position e tetn 2ch 12S_Data_OUT_ch1 amp 2 Vata_ 12S Data OUT ch58 amp 6 Ach 12S _Data_OUT_ch1 amp 2 I2S_ Data OUT_ch7 amp 8 2 1ch I2S_ Data _OUT_ch3 amp 4 I28_Data_OUT_ch788 Jumper position I2S_Data_OUT_ch5 amp 6 12S Data_OUT_ch38 amp 4 Ach 12S _Data_OUT_ch3 amp 4 12S Data OUT ch1 amp 2 2 1ch I2S_Data_OUT_ch1 amp 2 pee sinding Z9 syndjn Jumper symbol C 3 STEP3 Stacking miniAMP on top of a miniDSP DIGI board miniAMP is a 12S slave only device that requires clock amp data from
3. 4ch 2x20W 8Q miniAMP is a 12S slave device only which can automatically detect any type of incoming 12S signal up to 192kKHz making it the perfect fit for your custom audio board miniAMP does not require any micro controller programming and can operate in standalone mode All it needs is a simple jumper configuration to select its mode of operation I2S Expansion Bus 101 Configuration flexibility is a core design feature of the miniDSP concept Using the 12S Inter IC Sound protocol synchronized digital audio data is shared between boards Besides the advantages of better noise immunity vs analog audio the choice of the widely known 12S protocol allows un paralleled design freedom While flexibility typically comes at the detriment of ease of use the hardware jumper configuration of the miniAMP or miniDIGI boards allows a simple yet reliable method to route the I2S data lines as you wish I2S protocol consists of the following signals Clocks They provides synchronization between ICs 12S_IN 12S input data lines carrying 2 x 24bit audio channels in sync with the clocks 12S OUT 12S output data lines carrying 2 x 24bit audio channels in sync with the clocks miniAMP being an output device only I2S OUT lines are available for selection on the module Lets move on to the typical audio flow diagram of a miniAMP module Digital signal Selection of Analog signal input 12S channel INPUTS OUTPUTS 12S BTL
4. SE 2x20W BTL h laS selection Header Or channels header 4x10W SE 2S Or Amplifier 2 1Ch Control signals Mute Power down Reset Gain PWM SUB 2 or 4ch output channels Step by Step configuration Please pay attention to the following diagrams to clearly understand how to correctly configure miniAMP 1 STEP1 Configuring the miniAMP mode miniAMP may be used in 3 possible configurations 2 ch mode 20W each under 8ohms and in Bridge Tied Load BTL mode 4 ch mode 10W each under 4ohms and in Single Ended SE mode 2 1 mode with 2 ch 10W SE 4ohm and 1 ch 20W BTL 8o0hms This configuration is done from the configuration header with a simple jumper switch and by the according output capacitor jumper See below diagram for more info 2 STEP2 Configuring the 12S routing Read the plug in datasheet to figure out which I2S channels output your loaded plug in will use on the miniDSP kit This information is useful to understand how external I O cards can link up to the miniDSP kit Taking for example the 2Way PEQ Crossover plug in you can read in the technical specification section Digital Inputs Plug in IN 1 amp 2 selectable on I2S_Data_In7 amp 8 Digital Outputs Plug in OUT 1 2 3 4 available on I2S_Data_Out1 2 3 4 Un processed signal from ADC on 12S Data_Out5 6 Un processed signal from Digital IN on I2S_Data_Out 7 8 mews p Closed Open Config2 Config 2ch Closed Open mode 4ch Jumper symbol
5. if you have any technical questions you d like to clarify don t hesitate to contact our technical support team on the miniDSP forum or directly by email at info minidsp com
6. an I2S master device miniDSP miniDIGI When stacking miniAMP here are the potential configurations miniDSP MCLK Slave miniDIGI 12S Slave miniAMP I2S Slave miniDIGI 12S Master miniAMP I2S Slave miniDSP MCLK master miniAMP 12S Slave Please refer to the respective manual of each product for information on master slave configuration Boards share I2S and power by installing provided link cables on each side of the board Link cables on each side of the board allow sharing of the expansion connector signals 12S amp power man id sp Note To quickly confirm your jumper configuration please use the Jumper Chart available in the download section of miniDSP website 4 STEP4 Providing DC power to the device Before connecting your speakers to the miniAMP outputs we strongly recommend to perform a test run without your speakers connected See below symbol of the polarity of the DC connector positive polarity miniAMP can operate from any DC power supply ranging from 12 to 24VDC However for best performance an 18 24VDC supply rated at 2 5A 60W is recommended Even with its good Power Supply Rejection Ratio PSSR specifications allowing it to reject noise from the supply we would still advise you to select a good quality DC supply Finally note that a single power supply to the miniAMP module will provide power to all the other boards stacked in this configuration Important Connect the DC ja
7. ck before turning on the power supply to prevent any potential damage Turn On the power supply and make sure the blue LED on the module turns on If this step is un successful for any reasons please contact our tech support team before moving further along 5 STEP5 Wiring speaker cables to the module With the amplifier turned OFF connect your speakers to the module as shown below Depending on the miniAMP mode 2ch 2 1 4ch speaker wiring and output jumper configuration is different so please make sure to pay attention to the following diagrams 2 Channel Mode BTL 4 Channel Mode SE CH1 CH2 CH3 CH4 CH1 Gma 2 1 Channel MODE SE BTL ea e CH1 CH2 CH3 SE SE BTL Warning CH2 requires to be wired as shown on the diagram otherwise the channels will be out of phase 6 STEP6 First test Time to listen to your miniDSP Rig Before doing so we however strongly recommend that you insure levels are turned down in your miniDSP plug in configuration or at your digital audio source This is to prevent any un configured filters or any other DSP settings to potentially harm your audio system Enjoy Disclaimer As with any other products we strongly recommend to exert caution when setting up your miniAMP system Improper configuration of the device could potentially damage your system and DSP4YOU Ltd cannot be held responsible to any damage resulting from use of this product In doubts or
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