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
k
Ω
Sample and hold switch
resistance
Input capacitance
53
pF
Power-down to wakeup
9.6
19.2
µ
s
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.