More　and　more　analog　and　mixed-signal　(AMS)　blocks　are　integrated　into　system　on　chip　(SoC)　platform　due　to　intense　market　competition.　In　this　paper,　we　present　a　16　bit　successive　approximation　register　(SAR)　analog-to-digital　converter　(ADC)　IP　that　is　much　smaller　and　less　power　cost　than　other　recently　reported　SAR　ADCs.　In　addition,　we　use　several　techniques　to　improve　area　and　power.　This　work　has　multi　input　channels　with　programing　input　scale.　A　high　accuracy　reference　voltage　and　low　noise　comparator　proposed　in　this　design.　We　also　design　on-chip　calibration　and　oversampling　digital　filter　to　achieve　a　higher　SNR.