SAM7S256_14 Datasheet, PDF (545/775 Pages) ATMEL Corporation – ARM-based Flash MCU

36.5.7 ADC Timings
Each ADC has its own minimal Startup Time that is programmed through the field STARTUP in the Mode Register
ADC_MR.
In the same way, a minimal Sample and Hold Time is necessary for the ADC to guarantee the best converted final
value between two channels selection. This time has to be programmed through the bitfield SHTIM in the Mode
Register ADC_MR.
Warning: No input buffer amplifier to isolate the source is included in the ADC. This must be taken into consider-
ation to program a precise value in the SHTIM field. See the section, ADC Characteristics in the product datasheet.
SAM7S Series [DATASHEET]
6175M–ATARM–26-Oct-12
545