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The achieved scan rate of the ADC depends on the following factors,https://www.cypress.com/file/387826/download
▪ ADC clock rate
▪ Number of channels
▪ Achieved acquisition time
As number of channels is part of it, this will affect the maximum achievable sample rate. Please see the ADC Datasheet.
PSoC6 also has 8-bit and 7-bit resolution IDACs additional to the VDAC. These with a resistor load and opamp buffer can be also used if the resolution is sufficient.