Samsung S3F401F - Manual (Page 30)

S3F401F_UM_REV1.00 A/D CONVERTER
2-3
3. A/D CONVERTER OPERATION
3.1 FUNCTION DESCRIPTION
ADC has 3-analog input channels, SHA1, SHA2 and SHA3. After 3 conversion of ADC, the result of SHA1 is
pushed into the ADCRESULT1, the result of SHA2 is pushed into the ADCRESULT2 and the result of SHA3 is
pushed into the ADCRESULT3.
3.1.1 ADC Input
AIN[14:0] function pins are used for an analog input source to convert by ADC. ADC 3-input channels can be
selected one among AIN[14:0] inputs. Input signal range is followed by the boundary of reference, Reference TOP
and Reference BOTTOM.
Input Voltage Range: 0.0V ~ 3.3V
Reference Bottom = 0.0V, Reference Top = 3.3V
Reference Top - Reference Bottom
2
Resolution
1 LSB =
3.3V - 0.0V
2
12
3.3V
4096
0.806mV = = =
Table 2-1. ADC Input & Output Range
Index SHA1, SHA2, SHA3 Input (V) Digital Output (Binary) Digital Output (HEX)
0 0.000000 ~ 0.000806 0000_0000_0000 0x000
1 0.000806 ~ 0.001612 0000_0000_0001 0x001
2 0.001612 ~ 0.002418 0000_0000_0010 0x002
••• ••• ••• •••
1239 0.998634 ~ 0.999440 0100_1101_0111 0x4D7
1240 0.999440 ~ 1.000246 0100_1101_1000 0x4D8
1241 1.000246 ~ 1.001052 0100_1101_1001 0x4D9
••• ••• ••• •••
2047 1.649194 ~ 1.650000 0111_1111_1111 0x7FF
2048 1.650000 ~ 1.650806 1000_0000_0000 0x800
2049 1.650806 ~ 1.651612 1000_0000_0001 0x801
••• ••• ••• •••
4093 3.297582 ~ 3.298388 1111_1111_1101 0xFFD
4094 3.298388 ~ 3.299194 1111_1111_1110 0xFFE
4095 3.299194 ~ 3.300000 1111_1111_1111 0xFFF