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RX634 Scheda tecnica(PDF) 93 Page - Renesas Technology Corp

Il numero della parte RX634
Spiegazioni elettronici  54 MHz 32-bit RX MCU with FPU, 90 DMIPS, up to 2-Mbyte flash memory
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Produttore elettronici  RENESAS [Renesas Technology Corp]
Homepage  http://www.renesas.com
Logo RENESAS - Renesas Technology Corp

RX634 Scheda tecnica(HTML) 93 Page - Renesas Technology Corp

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R01DS0255EJ0100 Rev.1.00
Page 93 of 106
Feb 25, 2015
RX634 Group
5. Electrical Characteristics
Figure 5.37
Illustration of A/D Converter Characteristic Terms
Absolute accuracy
Absolute accuracy is the difference between output code based on the theoretical A/D conversion characteristics, and the
actual A/D conversion result. When measuring absolute accuracy, the voltage at the midpoint of the width of analog
input voltage (1-LSB width), that can meet the expectation of outputting an equal code based on the theoretical A/D
conversion characteristics, is used as an analog input voltage. For example, if 12-bit resolution is used and if reference
voltage (VREFH0 = 5.12 V), then 1-LSB width becomes 1.25 mV, and 0 mV, 1.25 mV, 2.5 mV, ... are used as analog
input voltages.
If analog input voltage is 10 mV, absolute accuracy = ±5 LSB means that the actual A/D conversion result is in the range
of 003h to 00Dh though an output code, 008h, can be expected from the theoretical A/D conversion characteristics.
Integral nonlinearity error (INL)
Integral nonlinearity error is the maximum deviation between the ideal line when the measured offset and full-scale
errors are zeroed, and the actual output code.
Integral nonlinearity
error (INL)
Actual A/D conversion
characteristic
Ideal A/D conversion
characteristic
Analog input voltage
Offset error
Absolute accuracy
Differential nonlinearity error (DNL)
Full-scale error
FFFh
000h
0
Ideal line of actual A/D
conversion characteristic
1-LSB width for ideal A/D
conversion characteristic
Differential nonlinearity error (DNL)
1-LSB width for ideal A/D
conversion characteristic
VREFH0
(full-scale)
A/D converter
output code


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