With the correct choice the ADC input range is 0 to 5V (Vadd). You may provide a 2.5V reference (DAC) and configure the ADC as differential.
Aamof the ADC within the PSoC5 are more sophisticate than in PSoC1, although the former lacks some analog functionality the PSoC1 has. I would suggest you to start with a CY8CKIT-059 which you can get from a local distri for US$10. You even could think about using a PSoC4 chip which is a bit smaller than a PSoC5 but still is quite better than the PSoC1.
Q1 :what is the difference between using vdac8 or vref as a voltage reference ??
vref=vdda/2 (which equal 2.5 v)
vadc=2496 mv (8bit Hex=9c)
Q2 :what is the difference between using ADC_SAR or ADC_delsig ???
please review the images attached
< my signal is sine in range [-2.5-+2.5]v with offset=2.5v => the input signal in range [0,5]v arround 2.5v as agnd
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A1) Using a DAC allows adjusting the voltage at run-time.
A2) Please check datasheet.