Control a Texas Instruments PCM1808 Single-Ended, Analog-Input 24-Bit, 96KHz Stereo A/D Converter
Attach it to your ESP8266/Arduino directly or using an MCP23017 Expander as an intermediary.
This library relies upon the Alislahish-ICUsingMCP23017 library:
https://github.com/alislahish/Alislahish-ICUsingMCP23017
...which relies upon the Adafruit-MCP23017-Arduino-Library:
https://github.com/adafruit/Adafruit-MCP23017-Arduino-Library
Please include them both in your main sketch
See the examples folder for code and some sample oscilloscope output.
Consult the datasheet found below for a suitable test circuit
http://www.ti.com/product/pcm1808
https://www.adafruit.com/products/732
http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en023499
Take a look at the Alislahish-PLL1705 library to see some examples for using this chip with a TI PLL1705 multiclock generator IC.
by anwarhahjjeffersongeorge