Auverdion freeDSPx-AnalogIO-x8 User manual
GETTING STARTED WITH
ANALOGIO-X8!
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REVISION HISTORY
Revision
Description
Date
v1.0
Initial Version
5 Oct 2018
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ABOUT ANALOGIO-X8
AnalogIO-x8 is an expansion board for Infinitas or any other freeDSP board with at least one
I2S expansion header and supporting TDM streams. It adds 8 analog input channels and 8
analog output channels. The board provides the inputs and outputs on a Sub-D25 connector
with Tascam pinout. All channels are balanced and designed fo r+6dBu @ full-scale.
The ADC part is based on the AKM AK5558, the DAC part is based on AKM AK4458. Both
chips are providing state of the art conversion quality.
The expansion port provides the option to easily stack up two four boards and daisy chain
them.
The plans for the AnalogIO-x8 board are published under a Creative Commons Attribution
NonCommercial ShareAlike 4.0 International (CC BY-NC-SA 4.0) license, which allows the
unrestricted use and modification of the module for non-commercial purposes. This means
that experienced users can make their own version of the board, extending it and improving
it, as long as they credit freeDSP and auverdion and release their designs under the same
license.
The freeDSP brand and freeDSPx logo are copyright of Sebastian Merchel and Ludwig
Kormann and cannot be used without formal permission.
The auverdion brand and Infinitas logo are copyright of Raphael Knoop and cannot be used
without formal permission.
This getting started guide is published under the same CC license.
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IMPORTANT INFORMATION
The AnalogIO-x8 board might generate signals that may damage your audio equipment.
Please read and understand this manual before starting to work with your board. Adjust all
hardware settings and configure your software before connecting any audio equipment to
AnalogIO-x8. Always start with low volume on your amplifier and slowly increase the level to
reduce the risk of damaging your audio system.
AnalogIO-x8 is provided to you ‘as is’. We make no express or implied warranties whatsoever
with respect to its functionality, operability, or use, including, without limitation, any implied
warranties of merchantability, fitness for a particular purpose, or infringement. We expressly
disclaim any liability whatsoever for any direct, indirect, consequential, incidental or special
damages, including, without limitation, lost revenues, lost profits, losses resulting from
business interruption or loss of data regardless of the form of action or legal theory under
which the liability may be asserted, even if advised of the possibility or likelihood of such
damages. Features and specifications might change without prior notice.
Please keep in mind that AnalogIO-x8 is an open-source spare-time project. Questions and
new ideas can be discussed online with other DIYers. Please use the Digital Line Level
subforum @ diyAudio.com or the Truth Table subforum @ groupdiy.com to connect with other
people working with AnalogIO-x8 or Infinitas or freeDSP. Please create individual threads for
your topics only if you cannot find your issue in the existing threads. Some questions can be
answered by carefully reading this manual. We cannot provide individual support via email.
Thank you for your understanding!!
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OVERVIEW
!
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8 channel analog
input Sub-D25
8 channel analog
output Sub-D25
Analog power
supply
Analog power
supply
Expansion port input
Forwarding
expansion port
Single supply
option
8 channel
analog
output pin
header
8 channel
analog
input pin
header
HOW TO GET ANALOGIO-X8 UP AND RUNNING
GET EVERYTHING NEEDED
You will need a soldering iron with a fine tip plus some soldering experience to assemble the
surface mounted and through hole components.
Order the AnalogIO-x8 kit. Sometimes centralized buying of PCB and all parts is offered on
the forums. Please keep in mind that AnalogIO-x8 is a spare-time project. It may take some
time until a new batch of boards and/or kits is offered.
(a) Alternatively, order the PCB via www.tindie.com. You will also need to order all electronic
parts. The components can be ordered via DigiKey (or other distributors). This might be
the fastest option. A digikey shopping basket can be found here: https://www.digikey.de/
short/jnn2np
(b) Alternatively, you can manufacture your own circuit board or modify and extend the
original design. This might be the most flexible option, but needs more expertise (and
money) to get up and running.
(c) Alternatively, manufacture the printed circuit board and order all parts yourself. You might
want to locally organize centralized buying and board production together with some
friends. You can find the necessary KiCAD files of the board on the freeDSP website
www.freeDSP.cc. You will also need to order all electronic parts. The components can be
ordered via DigiKey (or other distributors).
SOLDER THE BOARD
You should start with soldering the most difficult part: The ICs. On youtube you can find
tutorials how to solder the QFNs packages, e.g.
https://www.youtube.com/watch?v=BvhE16vBfX4
Then continue with all the other SMDs and finally solder the THT components. Always start
with the components with lowest height.
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CONFIGURATION
The AnalogIO-x8 board supports both: Parallel and I2C control of ADC and DAC. The default
configuration given in the tables in the schematic set both chips into I2C control mode
because the MCU on the Infinitas board will configure them this way. Nevertheless, if your
system does not provide the opportunity to control the board by I2C you can configure the
ADC and DAC for stand alone operation by using the parallel mode. Please refer to the data
sheets of AK4458 and AK5558 for the right configuration.
The AnalogIO-x8 board accepts +/-12V… +/-15V for the analog power supply. In case you
only have a +12V supply coming from your freeDSP board you can mount the single supply
option around IC104. In this case you need to populate R102 and R105 with 0R00.
CONNECTIONS
AnalogIO-x8 was designed with having daisy chaining in mind. If you are using Infinitas you
connect AnalogIO-x8 by a ribbon cable with 64 wires on connector X101. If you now want to
add another AnalogIO-x8 board to the same port on Infinitas you connect X101 of the
second board with X102 of the first board. This way you can stack up to four boards on each
expansion port of Inifinitas.
You can use the same stacking scheme for any freeDSP board supporting the I2S expansion
header pinout. X101 and X102 provides the same pinout but four times in a row. AnalogIO-x8
only accepts TDM streams. 2 channel formats like I2S are not supported.
In case you don’t want to use the Sub-D25 connectors you can connect your own connector
board (e.g. with jacks, XLR…) on X201 and X302.
To simplify the distribution of +/-12V… +/-15V you can use X103 and X104 for daisy-
chaining.!
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APPENDIX
PART LIST
Reference
Qty
Value
Footprint
Order No.
digikey
B101 B102 B103
B104 B105
5
MountingHol
e_3.2mm_M3_
DIN965_Pad
C101 C104 C107
C116 C228 C240
C246 C258 C263
C279 C280 C282
C289 C290 C291
C292 C293 C294
C295 C296 C297
C298 C299 C300
C301 C302 C303
C304 C324 C332
C340 C348 C356
C365 C366 C367
C368 C369 C370
C371 C372 C373
C374 C375 C376
C377 C378 C379
C380 C381
50
100n
5% 50V X7R
C0805-X7R
399-1170-1-ND
C102 C103 C105
C106 C108 C115
C117 C118 C277
C278 C341 C364
12
10u0
20% 25V X5R
C0805-X7R
490-10748-1-ND
C109 C110 C111
C112 C113 C114
C203 C204 C213
C214 C221 C222
C227 C233 C234
C239 C243 C244
C245 C255 C256
C257 C267 C268
C283 C284 C305
C306 C313 C314
C318 C319 C325
C328 C329 C333
C334 C335 C344
C345 C349 C350
C351 C357 C360
C361
46
100u
20% 25V
C_Radial_D5
_L11_P2
399-6102-ND
C201 C202 C211
C212 C219 C220
C231 C232 C241
C242 C253 C254
C265 C266 C275
C276
16
1n00
5% 50V PPS
C0805-X7R
PCF1328CT-ND
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C205 C206 C215
C216 C223 C224
C235 C236 C247
C248 C259 C260
C269 C270 C285
C286
16
1n00
10% 50V X7R
C0805-X7R
399-1147-1-ND
C207 C208 C217
C218 C225 C226
C237 C238 C249
C250 C261 C262
C271 C272 C287
C288
16
100p
5% 50V C0G/
NP0
C0805-X7R
399-1122-1-ND
C209 C210 C229
C230 C251 C252
C273 C274
8
5n60
5% 16V PPS
C0805-X7R
PCF1193CT-ND
C264
1
4u70
20% 25V X5R
C0805-X7R
490-5422-1-ND
C281
1
10n0
10% 50V X7R
C0805-X7R
311-1136-1-ND
C307 C308 C315
C316 C320 C321
C330 C331 C336
C337 C346 C347
C352 C353 C362
C363
16
470p
2% 50V PPS
C0805-X7R
PCF1292CT-ND
C309 C310 C322
C323 C338 C339
C354 C355
8
27p0
5% 50V C0G/
NP0
C0805-X7R
399-1114-1-ND
C311 C312 C326
C327 C342 C343
C358 C359
8
3n90
5% 16V PPS
C0805-X7R
PCF1191CT-ND
C317
1
1u00
10% 16V X7R
C0805-X7R
311-1365-1-ND
D101
1
MELF_Standa
rd
IC101
1
TLE2426ID
Spannungsref
erenz
SOIC-8_3.9x
4.9mm_Pitch
1.27mm
296-1345-1-ND
IC102
1
ADM811TARTZ
Spannungsmon
itor
SOT-143
ADM811TARTZ-
REELCT-ND
IC103
1
LM1117MP-5.0
LDO
SOT-223
LM1117MP-5.0/
NOPBCT-ND
IC104
1
LM1117MPX-ADJ
LDO
SOT-223
LM1117MPX-ADJ/
NOPBCT-ND
IC105
1
NCP1117LPST33
LDO
SOT-223
NCP1117LPST33T
3GOSCT-ND
Reference
Qty
Value
Footprint
Order No.
digikey
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IC201 IC202
IC203 IC204
IC206 IC207
IC208 IC209
IC301 IC302
IC303 IC304
IC306 IC307
IC308 IC309
16
NE5532AD
OpAmp
SOIC8_3.9x4
.9mm_Pitch1
.27mm
NE5532AD8R2GOS
CT-ND
IC205
1
AK5558VN
ADC
QFN64_9x9mm
_Pitch0.5mm
_EP_Handsol
dering
974-1128-1-ND
IC305
1
AK4458VN
DAC
QFN48_7x7mm
_Pitch0.5mm
_EP_Handsol
dering
974-1082-1-ND
R101 R209 R210
R219 R220 R234
R235 R248 R249
R264 R265 R275
R276 R285 R286
R295 R296
17
100K
1% 0.125W
Thick
C0805-RES
311-100KCRCT-
ND
R102 R105
2
Resistor_Ho
rizontal_RM
7mm
R103 R305 R306
R312 R314 R321
R322 R329 R331
R339 R340 R346
R348 R357 R358
R369 R371
17
150R
1% 0.25W
Thin
C0805-RES
RNCP0805FTD150
RCT-ND
R104
1
931R
1% 0.125W
Thick
C0805-RES
311-931CRCT-ND
R201 R202 R211
R212 R221 R222
R240 R241 R255
R256 R267 R268
R277 R278 R287
R288
16
620R
0.5% 0.1W
Thin
C0805-RES
RR12P620DCT-ND
R203 R205 R213
R215 R223 R225
R242 R244 R257
R259 R269 R271
R279 R281 R289
R291
16
100R
1% 0.25W
Thin
C0805-RES
RNCP0805FTD100
RCT-ND
R204 R206 R214
R216 R224 R226
R243 R245 R258
R260 R270 R272
R280 R282 R290
R292
16
976R
0.5% 0.1W
Thin
C0805-RES
408-1761-1-ND
Reference
Qty
Value
Footprint
Order No.
digikey
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R207 R208 R217
R218 R227 R228
R246 R247 R262
R263 R273 R274
R283 R284 R293
R294
16
10R0
1% 0.25W
Thick
C0805-RES
RNCP0805FTD10R
0CT-ND
R229 R231 R233
R251 R252 R253
R297 R299 R300
R359 R360 R361
R364 R365 R375
R376 R377
17
0R00
1% 0.125W
Thick
C0805-RES
311-0.0ARCT-ND
R236 R250 R254
R266 R323 R334
R349 R356
8
20R0
1% 0.125W
Thick
C0805-RES
311-20.0CRCT-
ND
Reference
Qty
Value
Footprint
Order No.
digikey
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AE10935-ND
R261
1
51R0
1% 0.125W
Thick
C0805-RES
311-51.0CRCT-
ND
R230 R232 R237
R238 R239 R298
R374
7
47K0
1% 0.125W
Thick
C0805-RES
311-47.0KCRCT-
ND
R301 R303 R311
R313 R317 R319
R328 R330 R335
R337 R345 R347
R352 R354 R368
R370
16
4K42
0.5% 0.1W
Thin
C0805-RES
RR12P4.42KDCT-
ND
R302 R304 R315
R316 R318 R320
R332 R333 R336
R338 R350 R351
R353 R355 R372
R373
16
3K40
0.5% 0.1W
Thin
C0805-RES
RR12P3.4KDCT-
ND
R307 R308 R309
R310 R324 R325
R326 R327 R341
R342 R343 R344
R362 R363 R366
R367
16
4K70
1% 0.125W
Thin
C0805-RES
YAG3364CT-ND
X101 X102
2
IDC64
Pfostensteck
er
IDC64
ED10532-ND
X103 X104
2
MicroFit3 02x02
Stiftleiste
Microfit3_4
3045-0428
WM10670-ND
X201 X302
2
IDC26
Pfostensteck
er
IDC_Header_
Straight_26
pins
377-2269-ND
X202 X301
2
DSUB25F
gewinkelt
DSUB25FC
AE10935-ND
Reference
Qty
Value
Footprint
Order No.
digikey
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ASSEMBLY PRINT!
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SCHEMATIC
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Table of contents
