Searching for a tiny USB to I2S board [2*I2S (4 Channels)] + I2S High-Impedance ADC

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Hello experts!

1. I am looking for a tiny USB to I2S board, smaller than 60mm*40mm.
I have just found the miniDSP USBSTREAMER but its a bit bigger...

2. I would like to use that USB-I2S board with a ADC to stream signal from 4 high-impedance instruments..So in addition to the USB-I2S board I will be happy to get recommendations for the ADC part..
Currently I got the to from the PCM1803A breakout. but their inputs are low-impedance..Do you know some other ADC breakout with high impedance inputs?

Thanks in advance
Alon
 
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