How To Read A/D Converter Characteristics Table - NEC V850ES/F 3-L Series User Manual

Chapter 19

19.6 How to read A/D Converter characteristics table

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This section describes the terms related to the A/D Converter.
For details refer to the Electrical Target Specification
Resolution
The minimum analog input voltage that can be recognized, i.e., the ratio of an
analog input voltage to 1 bit of digital output is called 1 LSB (least significant
bit). The ratio of 1 LSB to the full scale is expressed as %FSR (full-scale
range). %FSR is the ratio of a range of convertible analog input voltages
expressed as a percentage, and can be expressed as follows, independently of
the resolution.
1%FSR = (Maximum value of convertible analog input voltage –
Minimum value of convertible analog input voltage)/100
= (AV
= AV
When the resolution is 10 bits, 1 LSB is as follows:
1 LSB = 1/2
= 0.098%FSR
The accuracy is determined by the overall error, independently of the
resolution.
Overall error
This is the maximum value of the difference between an actually measured
value and a theoretical value. It is a total of zero-scale error, full-scale error,
linearity error, and a combination of these errors.
The overall error in the characteristics table does not include the quantization
error.
User's Manual U18743EE1V2UM00
– 0)/100
REF
/100
REF
10
= 1/1,024
A/D Converter (ADC)