upd70f3422gj-gae-qs-ax Renesas Electronics Corporation., upd70f3422gj-gae-qs-ax Datasheet - Page 790

• Manufacturer Part Number: upd70f3422gj-gae-qs-ax
• Description: 32-bit Single-chip Microcontroller
• Manufacturer: Renesas Electronics Corporation.

Chapter 20
790
Figure 20-10
20.6 How to Read A/D Converter Characteristics Table
(1)
(2)
This section describes the terms related to the A/D Converter.
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.
When the resolution is 10 bits, 1 LSB is as follows:
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.
Overall error
Preliminary User’s Manual U17566EE1V2UM00
1%FSR
1 LSB
=
=
=
=
=
1 ...... 1
0 ...... 0
(Maximum value of convertible analog input voltage –
Minimum value of convertible analog input voltage)/100
(AV
AV
1/2
0.098%FSR
0
REF
10
REF
/100
= 1/1,024
Ideal line
– 0)/100
Analog input
Overall error
A/D Converter (ADC)
AV
REF