External TDM DACs
Regular I2S DACs support only 2 channels. With TDM we can get much more channels. However you need to use a microcontroller that supports TDM!
This is not yet supported by the AudioTools, but I am working on it. Please let me know if you want to help me...
The CS42448 CODEC from Cirrus Logic provides six multi-bit analog-to-digital and eight multi-bit digital-to-analog delta-sigma converters.The DAC is configured with the help of I2C.
| 1 | 2 | 3 | 4 | 5 |
|---|---|---|---|---|
| NC | SCL | SDA | NC | NC |
| GND | NC | NC | 5V | NC |
Master Control
The SPI pins are provided via the Master Control. Unfortunatly the pins are not indicated, so I am documenting them here. SCL is on the colum 2 and SDAa on colum 3 of the first row, if you position the board so that the master control is on the top.
The AD1938 is a high performance, single-chip codec from Analog Devices, that provides four analog-to-digital converters (ADCs) with input and eight digital-to-analog converters (DACs) with single-ended output. An SPI port is included, allowing a microcontroller to adjust volume and many other parameters.
Unfortunately this board does not make the SPI pins available, but you can configure the device with the help of the SIP3:
To use DTM at 48000, just remove the bridge.
