MiniDIGI is a digital audio input/output board that provides flexible connectivity for miniDSP kits and DIY audio projects. It has 2 SPDIF and 2 Toslink inputs, as well as buffered SPDIF and optical outputs. An asynchronous sample rate converter allows a wide range of digital signal inputs up to 216kHz. Jumper configurations provide selection of inputs, I2S routing, and master/slave settings. The miniDIGI allows for expanded digital I/O and customized pro audio and home theater systems.

1. MiniDIGI I/O
FEATURES MiniDIGI is the easiest path to achieve digital audio input & output
connectivity on our miniDSP kits or your custom DIY audio projects.
Hardware With a flexible architecture and Asynchronous Sample Rate Converter
•2 x SPDIF & 2 x Toslink inputs (ASRC), building SPDIF/Toslink powered designs couldn’t be easier.
•Buffered SPDIF & Optical outputs Based on an award-winning TI/Burr & Brown IC, the board is automati-
•Asynchronous Sample rate converter cally configured by a microcontroller, making it a flexible Plug’n’Play
(ASRC) allows wide range of digital standalone solution for different DIY audio projects.
signal (up to 216kHz)
•Easily stack with MiniDSP series
•Optional SPDIF transformer isolation
Configuration switches
•Source selection (1 out of 4 inputs)
•I2S routing (Select 1xIN, 1xOUT)
•Master/Slave selection
Power
•Wide range of power supply voltage
from 4.5 to 24Vdc.
•USB self-powered for miniDSP kit
with miniDIGI combination
Applications From its Asynchronous Sample Rate Converter (allowing up to 216kHz
•MiniDSP kit I/O expansion of digital audio input signal), to its flexible jumper configuration
•DIY audio projects (source & I2S routing), miniDIGI provides unique design freedom
•Custom Pro-Audio projects without the headaches. Greater common mode noise rejection, imped-
•Monitoring speakers ance matching and isolation are also available through optional SPDIF
•Processed multi-channel amplifiers transformers.
•Car audio
•Home theater system Stack it up, mix & match with other miniDSP cards and build a DSP
powered complete digital system in no time!
miniDIGI diagram
INPUTS OUTPUTS
Source Digital Sample I2S header Digital SPDIF#1
SPDIF#1/2
selection Audio Rate Source Audio
Toslink#1/2 header Receiver Converter Selection Transmitter Toslink#1
Routing of
Selection of 1xI2S_in
one of the I2S_IN ch1&2 I2S_OUT ch1&2
&
input source I2S_IN ch3&4 I2S_OUT ch3&4
1xI2S_out
I2S_IN ch5&6 I2S_OUT ch5&6
I2S_IN ch7&8 I2S_OUT ch7&8
Template miniDIGI configurations
Stereo 2 Way configuration Stereo 4 Way configuration
To
Digital signal miniAMP Speakers
Analog signal LEFT RIGHT
To 4 ch 4 ch
miniDSP miniDSP miniDSP miniDSP
amplifier Amplifier Amplifier
SPDIF/ SPDIF/ SPDIF/ SPDIF/Toslink
miniDIGI miniDIGI miniDIGI miniDIGI
Toslink Toslink Toslink
Option1 Option2
MiniDSP, powered by DSP4YOU Ltd
Features and Specifications subject to change prior notice

2. TECHNICAL SPECIFICATIONS
Item Description
Digital Audio inputs 2 x SPDIF on RCA connector, 2 x Optical inputs on Toslink connector
Digital Audio outputs 1 x SPDIF on RCA connector duplicated to 1xToslink optical output
Sample rate converter Up/Down sample digital audio input signal to miniDSP 48kHz SR
Data resolution Up to 24 bits
Dynamic range 128dB
THD + N (Full scale input) - 124dB
Maximum Input Sample Rate Up to 216kHz
SPDIF Transformer Isolation (Option) Optional transformer isolation for both inputs and outputs
Improves common mode noise rejection, impedance matching, isolation
from ground loops and short circuit protection
I2S Master/Slave configuration Self programmed with I2S Master/Slave configuration
I2S channel configuration Select which I2S channel you want to route the digital input/output signal.
See miniDIGI user manual for more details about configuration
Source selection header Select one of the four digital inputs (SPDIF1/2, Toslink1/2) with a jumper
Power supply 4.5~24Vdc input DC connector, 2.5mm connector - (150mA @5Vdc)
Automatically provides power to other stacked miniDSP boards
Dimensions (H x W x D) 75mm x 75mm (3”x3”)
MECHANICAL SPECIFICATIONS & EXPANSION CONNECTOR PIN OUT
Source Selection Header
75mm(2.95”) Select only 1 out of 4 inputs
Position Description
Optical IN 1 & 2 SPDIF IN 1 & 2
1 SPDIF #1
2 SPDIF #2
3 Optical #1
4 Optical #2
Source
selection
I2S Channel configuration
75mm(2.95”)
Expansion Position Description
connector
1 I2S_IN Ch1&2
2 I2S_IN Ch3&4
I2S channel
selection 3 I2S_IN Ch5&6
4 I2S_IN Ch7&8
5 I2S_OUT Ch1&2
6 I2S_OUT Ch3&4
7 I2S_OUT Ch5&6
8 I2S_OUT Ch7&8
DC in SPDIF OUT Optical OUT
ORDERING
SKU Description
800-221 miniDIGI with 2 x SPDIF in, 2 x Toslink in, 1 x SPDIF out, 1 x Toslink out
800-222 miniDIGI with optional transformer isolation on SPDIF inputs & outputs
800-223 Custom firmware configuration for SRC board. Contact us for more information.
MiniDSP, powered by DSP4YOU Ltd company
Features and Specifications subject to change prior notice