Question The datasheet of the AD7608 mentions the AD7608 being SPI compatible. I found the SCLK and SS but i havent found the pins for MISO and MOSI. Answer The MISO pin should connect to the DOUT A/DOUT B pin of the AD7608. The DOUT A pin is pin 24 and DOUT B is pin 25 when configured in serial mode. The AD7608 does not allow the ability to write to the ADC hence there is no MOSI. Please keep in mind: For the AD7608 to access all eight conversion results on one DOUT line, a total of 144 SCLK cycles are required. Or you need two SPI interfaces and 72 clocks each. you need to ensure the controller can generate the 144 / 72 Clock cycles

AD7608, AD7609: Schematic and PCB prints

Q EVB schematic and layout files A Please find the attached schematic, this version is provided by our product line engineer. Attachments: EVAL_AD7609_finalPrA_2.pdf

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AD7608 Production
The AD7608 is an 18-bit, 8-channel simultaneous sampling, analog-to-digital data acquisition system (DAS). The part contains analog input clamp protection...
Datasheet
AD7608 on Analog.com