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参数资料
型号： R5F212BASDFP
元件分类： 微控制器/微处理器
英文描述： 16-BIT, FLASH, 20 MHz, RISC MICROCONTROLLER, PQFP48
封装： 10 X 10 MM, 0.50 MM PITCH, PLASTIC, LQFP-48
文件页数： 66/138页
文件大小： 492K
代理商： R5F212BASDFP
245
4317K–AVR–03/2013
AT90PWM2/3/2B/3B
Figure 21-13. Differential Non-linearity (DNL)
Quantization Error: Due to the quantization of the input voltage into a finite number of codes,
a range of input voltages (1 LSB wide) will code to the same value. Always ± 0.5 LSB.
Absolute Accuracy: The maximum deviation of an actual (unadjusted) transition compared
to an ideal transition for any code. This is the compound effect of offset, gain error,
differential error, non-linearity, and quantization error. Ideal value: ± 0.5 LSB.
21.7
ADC Conversion Result
After the conversion is complete (ADIF is high), the conversion result can be found in the ADC
Result Registers (ADCL, ADCH).
For single ended conversion, the result is:
where V
IN is the voltage on the selected input pin and VREF the selected voltage reference (see
Table 21-3 on page 247 and Table 21-4 on page 248). 0x000 represents analog ground, and
0x3FF represents the selected reference voltage.
If differential channels are used, the result is:
where V
POS is the voltage on the positive input pin, VNEG the voltage on the negative input pin,
GAIN the selected gain factor and V
REF the selected voltage reference. The result is presented
in two’s complement form, from 0x200 (-512d) through 0x1FF (+511d). Note that if the user
wants to perform a quick polarity check of the result, it is sufficient to read the MSB of the result
(ADC9 in ADCH). If the bit is one, the result is negative, and if this bit is zero, the result is posi-
tive. Figure 21-14 shows the decoding of the differential input range.
Table 82 shows the resulting output codes if the differential input channel pair (ADCn - ADCm) is
selected with a reference voltage of V
REF.
Output Code
0x3FF
0x000
0
VREF Input Voltage
DNL
1 LSB
ADC
V
IN
1023
V
REF
--------------------------
=
ADC
V
POS
V
NEG
–
GAIN 512
V
REF
------------------------------------------------------------------------
=
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相关代理商/技术参数
参数描述
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