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參數(shù)資料
| 型號(hào)： | MC908QT4ACFQE |
| 廠商： | FREESCALE SEMICONDUCTOR INC |
| 元件分類(lèi)： | 微控制器/微處理器 |
| 英文描述： | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, DSO8 |
| 封裝： | 4 X 4 MM, 1 MM HEIGHT, 0.80 MM PITCH, LEAD FREE, DFN-8 |
| 文件頁(yè)數(shù)： | 139/200頁(yè) |
| 文件大?。?/td> | 1349K |
| 代理商： | MC908QT4ACFQE |
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Functional Description
MC68HC908QYA/QTA Family Data Sheet, Rev. 3
Freescale Semiconductor
43
3.3.4.4 Code Width and Quantization Error
The ADC10 quantizes the ideal straight-line transfer function into 1024 steps (in 10-bit mode). Each step
ideally has the same height (1 code) and width. The width is defined as the delta between the transition
points from one code to the next. The ideal code width for an N bit converter (in this case N can be 8 or
10), defined as 1LSB, is:
1LSB = (VREFH–VREFL) / 2
N
Because of this quantization, there is an inherent quantization error. Because the converter performs a
conversion and then rounds to 8 or 10 bits, the code will transition when the voltage is at the midpoint
between the points where the straight line transfer function is exactly represented by the actual transfer
function. Therefore, the quantization error will be ± 1/2LSB in 8- or 10-bit mode. As a consequence,
however, the code width of the first ($000) conversion is only 1/2LSB and the code width of the last ($FF
or $3FF) is 1.5LSB.
3.3.4.5 Linearity Errors
The ADC10 may also exhibit non-linearity of several forms. Every effort has been made to reduce these
errors but the user should be aware of them because they affect overall accuracy. These errors are:
Zero-Scale Error (EZS) (sometimes called offset) — This error is defined as the difference between
the actual code width of the first conversion and the ideal code width (1/2LSB). Note, if the first
conversion is $001, then the difference between the actual $001 code width and its ideal (1LSB) is
used.
Full-Scale Error (EFS) — This error is defined as the difference between the actual code width of
the last conversion and the ideal code width (1.5LSB). Note, if the last conversion is $3FE, then the
difference between the actual $3FE code width and its ideal (1LSB) is used.
Differential Non-Linearity (DNL) — This error is defined as the worst-case difference between the
actual code width and the ideal code width for all conversions.
Integral Non-Linearity (INL) — This error is defined as the highest-value the (absolute value of the)
running sum of DNL achieves. More simply, this is the worst-case difference of the actual transition
voltage to a given code and its corresponding ideal transition voltage, for all codes.
Total Unadjusted Error (TUE) — This error is defined as the difference between the actual transfer
function and the ideal straight-line transfer function, and therefore includes all forms of error.
3.3.4.6 Code Jitter, Non-Monotonicity and Missing Codes
Analog-to-digital converters are susceptible to three special forms of error. These are code jitter,
non-monotonicity, and missing codes.
Code jitter is when, at certain points, a given input voltage converts to one of two values when
sampled repeatedly. Ideally, when the input voltage is infinitesimally smaller than the transition
voltage, the converter yields the lower code (and vice-versa). However, even very small amounts
of system noise can cause the converter to be indeterminate (between two codes) for a range of
input voltages around the transition voltage. This range is normally around ±1/2LSB but will
increase with noise.
Non-monotonicity is defined as when, except for code jitter, the converter converts to a lower code
for a higher input voltage. Non-monotonicity is present if the apparent code jitter covers three codes
(when the converter’s output is indeterminate between three values for a given input voltage) or is
greater than 1LSB.
Missing codes are those which are never converted for any input value. In 8-bit or 10-bit mode, the
ADC10 is guaranteed to be monotonic and to have no missing codes.
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PDF描述 |
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| MC908QY2ACDWER | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO16 |
| MC908QT2AMDWE | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8 |
| MC908QY1AMPE | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP16 |
| MC908QT4AMDWE | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDSO8 |
| MC908QY4AMPE | 8-BIT, FLASH, 8 MHz, MICROCONTROLLER, PDIP16 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MC908QT4ACPE | 功能描述:8位微控制器 -MCU CI NITRON SOG RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC908QT4AMDTE | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers |
| MC908QT4AMDWE | 功能描述:8位微控制器 -MCU CI NITRON SOG RoHS:否 制造商:Silicon Labs 核心:8051 處理器系列:C8051F39x 數(shù)據(jù)總線寬度:8 bit 最大時(shí)鐘頻率:50 MHz 程序存儲(chǔ)器大小:16 KB 數(shù)據(jù) RAM 大小:1 KB 片上 ADC:Yes 工作電源電壓:1.8 V to 3.6 V 工作溫度范圍:- 40 C to + 105 C 封裝 / 箱體:QFN-20 安裝風(fēng)格:SMD/SMT |
| MC908QT4AMDWER | 制造商:Freescale Semiconductor 功能描述:MCU 8BIT HC08 CISC 4KB FLASH 3.3V/5V 8SOIC - Tape and Reel |
| MC908QT4AMFQE | 制造商:FREESCALE 制造商全稱(chēng):Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers |
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