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ATMEGA16 bảng dữ liệu(PDF) 208 Page - ATMEL Corporation

tên linh kiện ATMEGA16
Giải thích chi tiết về linh kiện  8-bit AVR Microcontroller with 16K Bytes In-System Programmable Flash
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Trang chủ  http://www.atmel.com
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ATMEGA16 bảng dữ liệu(HTML) 208 Page - ATMEL Corporation

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ATmega16(L)
2466E–AVR–10/02
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 2n-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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