Hello guys. Im trying build and dsp board and it needs 4 adc/dac modules tdm over i2s.
Each module with 8 io channel that i need him work simultaneously.
Anyone could suggest me any cheap option?
Each module with 8 io channel that i need him work simultaneously.
Anyone could suggest me any cheap option?
Are saying you need a total of 32 ADC channels and 32 DAC channels (or maybe 16 of each) and you want to interface over I2S bus to a DSP chip? No USB or other interface? Are these 16-bit data converters or 24-bit?
Yes
The idea of the project is build an very modular usb audio interface. The board is the Infinitas from freedsp.cc. this board is only able to get tdm over i2s.The main board DSP is an USB interface. So USB doesn't make very sense. But if easy and cheap to convert to i2s can be another interface.
I prefer 25-bit but 17 is nice too.
https://github.com/freeDSP/freeDSPx-AnalogIO-x8 is what is meant to be used with Infinity. There are no cheap TDM converters, though AKM used to have cheaper compatible alternatives for AK5558 ADC and the DAC.
No. I2S and TDM are two separate protocols. Analog IO is a TDM module. I2S has nothing to do with it.
What is commonly referred to as 'I2S bus' is different from I2S protocol. Presumably the OP means that TDM protocol is being used on what might be loosely called, "I2S bus."
If there is a preferred name for the bus it would be fine to use that.
If there is a preferred name for the bus it would be fine to use that.
The I2S bus is the protocol. I2S is a specific arrangement of clock and data and you can no more run TDM over I2S than you can run USB over SPI.
Some SoC documentations refer to this as a PCM audio interface/peripheral. IMO a good compromise.
Maybe is impossible using 1 board, but using 4, or splitting DAC and DAC and that case using 8 boards like analógico itself.