Hi All,
Recently, on the market is available premium SRC AK4137 from AKM (Asahi Kasei Microdevices).
The chip is interesting since it is not only the SRC but also converter from PCM to DSD and DSD to PCM
I wanted to test it, but AKM don't have any Evaluation board or Starter kit for this chip.
So I decided to design my own Evaluation board.
AK4137 features:
-PCM / DSD conversion function
-conversion from 2.8/5.6/11.2MHz DSD to PCM format, and vice versa.
-Maximum Sampling Frequency, Bit rate: PCM768kHz/32-bit, DSD256(11.2MHz)
-DR: 186dB
-THD+N: -150dB
-Sound Color Digital Filter: 4 types
Evaluation board features:
- hardware or software configuration mode
- SPI or I2C mode
- galvanic isolation of I2C bus (option)
- gerenal purpose I/O (I2C extender)
- low noise LDOs (LP5907 or LP2985)
- separate LDO for XOs
- different option for master clock (External clock, crystal, XOs )
- clock sourse can be selected by I2C extender
- serial termination rezistors (I2S bus and clocks)
- IDC or U-FL connector for clocks an I2S bus
- different footprints for decoupling capacitors (SMD and THT option)
- reset by switch or I2C extender
- PBfree
Schematic, render of PCB and real PCB photos in attachment.
I received PCBs yesterday and I didn't have time to assemble the first piece.
If anyone is interested I have some spare PCBs.
Chips are now avaliabie in DigiKey.
Best regards
JarekC
Recently, on the market is available premium SRC AK4137 from AKM (Asahi Kasei Microdevices).
The chip is interesting since it is not only the SRC but also converter from PCM to DSD and DSD to PCM
I wanted to test it, but AKM don't have any Evaluation board or Starter kit for this chip.
So I decided to design my own Evaluation board.
AK4137 features:
-PCM / DSD conversion function
-conversion from 2.8/5.6/11.2MHz DSD to PCM format, and vice versa.
-Maximum Sampling Frequency, Bit rate: PCM768kHz/32-bit, DSD256(11.2MHz)
-DR: 186dB
-THD+N: -150dB
-Sound Color Digital Filter: 4 types
Evaluation board features:
- hardware or software configuration mode
- SPI or I2C mode
- galvanic isolation of I2C bus (option)
- gerenal purpose I/O (I2C extender)
- low noise LDOs (LP5907 or LP2985)
- separate LDO for XOs
- different option for master clock (External clock, crystal, XOs )
- clock sourse can be selected by I2C extender
- serial termination rezistors (I2S bus and clocks)
- IDC or U-FL connector for clocks an I2S bus
- different footprints for decoupling capacitors (SMD and THT option)
- reset by switch or I2C extender
- PBfree
Schematic, render of PCB and real PCB photos in attachment.
I received PCBs yesterday and I didn't have time to assemble the first piece.
If anyone is interested I have some spare PCBs.
Chips are now avaliabie in DigiKey.
Best regards
JarekC
Attachments
Hi.
If LP5907 LDO is used , please remember that LP5907-3.3V has Vin Max = 5.5V.
I sugest to bypass bridge D1 and supply from 5V.
If LP2895-3.3V is used, there is no problem, Vin Max =16V
Best regards,
JarekC
If LP5907 LDO is used , please remember that LP5907-3.3V has Vin Max = 5.5V.
I sugest to bypass bridge D1 and supply from 5V.
If LP2895-3.3V is used, there is no problem, Vin Max =16V
Best regards,
JarekC
Latest version software for control AK4137 & AK4490:
http://www.audiostereo.pl/index.php?app=core&module=attach§ion=attach&attach_id=336665
Regards,
JarekC
http://www.audiostereo.pl/index.php?app=core&module=attach§ion=attach&attach_id=336665
Regards,
JarekC
I'm experimenting with an AK4137 in serial mode but I seem to be stuck at something seemingly trivial.
I'm using pins CM3-0 to set the various modes of the SRC but I can't get it to run in Mode 8. Looking at the datasheet, it appears that CM3 must be pulled high and all of the other pins (CM2-0) must be floating(?!). Whenever I try to start the chip while I have CM3 pulled high the chip doesn't start up, no matter what I do to pins CM2-0.
Any ideas?
I'm using pins CM3-0 to set the various modes of the SRC but I can't get it to run in Mode 8. Looking at the datasheet, it appears that CM3 must be pulled high and all of the other pins (CM2-0) must be floating(?!). Whenever I try to start the chip while I have CM3 pulled high the chip doesn't start up, no matter what I do to pins CM2-0.
Any ideas?
To run in Mode 8 CM3 must pulled high, CM2-0 pulled low or high (doesn't matter).
Show schematic maybe I will help you.
To run in 768kHz, MCLK must be 49.152MHz (49.152MHz / 64 fs = 768 kHz).
I'm using an MCP23008 to control several of the AK4137's pins, they all behave exactly the way they should (I'm getting either upsampling or downsampling, depending on the MCLK and the CM3-0 settings), but I can't nail Mode 8.
No matter what I do to CM2-0, when I pull CM3 high the chip doesn't start up (no reply to I2C commands). It goes without saying that I'm changing the CM3-0 pins while I'm keeping PDN low.
This is my schematic:
I'm testing with an AK4118 s/pdif receiver which outputs a max ~24MHz MCLK so I've only managed to go up to 192KHz. If I can get to Mode 8 I should be able to go up to 384K.
The idea is to build an s/pdif receiver with built-in upsampling and converting to DSD, including a second I2S input for a USB interface or an RPi.
When I'm done with the design and have verified that it works I'll do a proper presentation (and of course give out the full schematics, code, etc.).
No matter what I do to CM2-0, when I pull CM3 high the chip doesn't start up (no reply to I2C commands). It goes without saying that I'm changing the CM3-0 pins while I'm keeping PDN low.
This is my schematic:
I'm testing with an AK4118 s/pdif receiver which outputs a max ~24MHz MCLK so I've only managed to go up to 192KHz. If I can get to Mode 8 I should be able to go up to 384K.
The idea is to build an s/pdif receiver with built-in upsampling and converting to DSD, including a second I2S input for a USB interface or an RPi.
When I'm done with the design and have verified that it works I'll do a proper presentation (and of course give out the full schematics, code, etc.).
Attachments
Can you change other modes ex. from Mode 0 to Mode 2 ?
As you know in PDN = "0" it is RESET and Power Down.
When you change in PDN pin from "0" to "1" in:
PSN, CM3-0, OBIT1-0, TDM, ODIF1-0, IDIF2-0 and CAD1-0 pins you must set correct values.
I selected it by "hardware" as in post 1, and its work OK.
Edit:
try to analize by voltometr if you have "1" on CM3 when change PDN from "0" to "1"
As you know in PDN = "0" it is RESET and Power Down.
When you change in PDN pin from "0" to "1" in:
PSN, CM3-0, OBIT1-0, TDM, ODIF1-0, IDIF2-0 and CAD1-0 pins you must set correct values.
I selected it by "hardware" as in post 1, and its work OK.
Edit:
try to analize by voltometr if you have "1" on CM3 when change PDN from "0" to "1"
Last edited:
Yes, I can change between all of the other modes, except for Mode 8.
I take care to properly set all of the pins before power-up (PDN -> high).
Still, Mode 8 won't get enabled.
It looks like I'm missing something pretty basic.
I'll check CM3 like you said but I've tried hardwiring it to Vcc with no change..
I take care to properly set all of the pins before power-up (PDN -> high).
Still, Mode 8 won't get enabled.
It looks like I'm missing something pretty basic.
I'll check CM3 like you said but I've tried hardwiring it to Vcc with no change..
Try manually CM3 to Vcc via R=47k and try manually reset as in schematic on post 1 (switch SW1, C5=100n, R9=10k, D1) and power up supply your SRC. You look if it work when power on.
Hi,
We are plan to integrate AK4137EQ PCM to DSD chip in our project. Before that we plan to validate some testing in AK4137EQ. Do you have Evaluation PCB and Schematic for this chip.
Regards,
Anand Selvaraj.
We are plan to integrate AK4137EQ PCM to DSD chip in our project. Before that we plan to validate some testing in AK4137EQ. Do you have Evaluation PCB and Schematic for this chip.
Regards,
Anand Selvaraj.
Hi,
I need AKM4137 evaluation kit spare PCB or Assembled Board. Do you have the board.
Please let me know.
Thanks
Anand Selvaraj
Hi,
I am interested in your Eval kit PCB. How can i get spare PCB from you and please provide cost details.
Regards,
Anand Selvaraj
I am interested in your Eval kit PCB. How can i get spare PCB from you and please provide cost details.
Regards,
Anand Selvaraj
Hello,
I have 3 spare boards (only PCB without elements).
Costs:
Main board 32 PLN (about 8 USD)
Additionally:
USB to I2C converter board 9PLN (about 2.3 USD)
Case for USB to I2C converter 5PLN (about 1.3 USD)
Schamatic and software avaliable free to download.
Details by PM.
Regads,
JarekC
I have 3 spare boards (only PCB without elements).
Costs:
Main board 32 PLN (about 8 USD)
Additionally:
USB to I2C converter board 9PLN (about 2.3 USD)
Case for USB to I2C converter 5PLN (about 1.3 USD)
Schamatic and software avaliable free to download.
Details by PM.
Regads,
JarekC
Hi Jarekc,
Thanks for your quick reply.
We planning to buy 3no's of main board. Please share BOM details like component part no and manufacturer details, which will help to ordering the components. Please share mode of payment and quotation details for further proceeding. Now i am in India and if ordered the Bare PCB means When will expect the same.
Regards,
Anand Selvaraj.
Thanks for your quick reply.
We planning to buy 3no's of main board. Please share BOM details like component part no and manufacturer details, which will help to ordering the components. Please share mode of payment and quotation details for further proceeding. Now i am in India and if ordered the Bare PCB means When will expect the same.
Regards,
Anand Selvaraj.
Hi Jarekc,
Thanks for your quick reply.
We planning to buy 3no's of main board. Please share BOM details like component part no and manufacturer details, which will help to ordering the components. Please share mode of payment and quotation details for further proceeding. Now i am in India and if ordered the Bare PCB means When will expect the same.
Regards,
Anand Selvaraj.
Boards are sold out.
BOM (max version) for main board and schematic for USB->I2C converter in attachment.
Regards
JarekC
BOM (max version) for main board and schematic for USB->I2C converter in attachment.
Regards
JarekC