User's Manual

15
This ADC is 12 bit successive-approximation circuit, and electronic specification is
shown in the following table.
Electronic Characteristics:
Specification Min Typ Max Unit Comments/Conditions
Resolution 12 Bits
Differential nonlinearity -4 +4 LSB
Analog Vdd = ADC
reference 2.4MHz sample
rate
Integral nonlinearity -8 +8 LSB
Gain Error -2.5 +2.5 %
Offset Error -4 +40 LSB
Input Range GND 4.4V V
Input serial resistance 2 kΩ
Sample and hold switch
resistance
Input capacitance 53 pF
Power-down to wakeup 9.6 19.2 µs
User can introduces a signal in the ADC pin directly and use the AT command
“AT+CADC” to get the raw data which is between 0 and 4095. The data can be
transformed to any type such as voltage, temperature, etc.