參數(shù)資料
型號: MC80C32-36SC
廠商: ATMEL CORP
元件分類: 微控制器/微處理器
英文描述: 8-BIT, 36 MHz, MICROCONTROLLER, CDIP40
封裝: 0.600 INCH, SIDE BRAZED, DIP-40
文件頁數(shù): 50/132頁
文件大小: 10886K
代理商: MC80C32-36SC
216
ATmega8535(L)
2502K–AVR–10/06
Offset Compensation
Schemes
The gain stage has a built-in offset cancellation circuitry that nulls the offset of differen-
tial measurements as much as possible. The remaining offset in the analog path can be
measured directly by selecting the same channel for both differential inputs. This offset
residue can be then subtracted in software from the measurement results. Using this
kind of software based offset correction, offset on any channel can be reduced below
one LSB.
ADC Accuracy Definitions
An n-bit single-ended ADC converts a voltage linearly between GND and V
REF in 2
n
steps (LSBs). The lowest code is read as 0, and the highest code is read as 2
n - 1.
Several parameters describe the deviation from the ideal behavior:
Offset: The deviation of the first transition (0x000 to 0x001) compared to the ideal
transition (at 0.5 LSB). Ideal value: 0 LSB.
Figure 107. Offset Error
Gain Error: After adjusting for offset, the Gain Error is found as the deviation of the
last transition (0x3FE to 0x3FF) compared to the ideal transition (at 1.5 LSB below
maximum). Ideal value: 0 LSB.
Figure 108. Gain Error
Output Code
VREF Input Voltage
Ideal ADC
Actual ADC
Offset
Error
Output Code
VREF Input Voltage
Ideal ADC
Actual ADC
Gain
Error
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