- 您現在的位置：買賣IC網 > PDF目錄371076 > MC908QL4C (Motorola, Inc.) Microcontrollers PDF資料下載
參數資料
| 型號： | MC908QL4C |
| 廠商： | Motorola, Inc. |
| 英文描述： | Microcontrollers |
| 中文描述： | 微控制器 |
| 文件頁數： | 49/222頁 |
| 文件大小： | 2861K |
| 代理商： | MC908QL4C |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁第31頁第32頁第33頁第34頁第35頁第36頁第37頁第38頁第39頁第40頁第41頁第42頁第43頁第44頁第45頁第46頁第47頁第48頁當前第49頁第50頁第51頁第52頁第53頁第54頁第55頁第56頁第57頁第58頁第59頁第60頁第61頁第62頁第63頁第64頁第65頁第66頁第67頁第68頁第69頁第70頁第71頁第72頁第73頁第74頁第75頁第76頁第77頁第78頁第79頁第80頁第81頁第82頁第83頁第84頁第85頁第86頁第87頁第88頁第89頁第90頁第91頁第92頁第93頁第94頁第95頁第96頁第97頁第98頁第99頁第100頁第101頁第102頁第103頁第104頁第105頁第106頁第107頁第108頁第109頁第110頁第111頁第112頁第113頁第114頁第115頁第116頁第117頁第118頁第119頁第120頁第121頁第122頁第123頁第124頁第125頁第126頁第127頁第128頁第129頁第130頁第131頁第132頁第133頁第134頁第135頁第136頁第137頁第138頁第139頁第140頁第141頁第142頁第143頁第144頁第145頁第146頁第147頁第148頁第149頁第150頁第151頁第152頁第153頁第154頁第155頁第156頁第157頁第158頁第159頁第160頁第161頁第162頁第163頁第164頁第165頁第166頁第167頁第168頁第169頁第170頁第171頁第172頁第173頁第174頁第175頁第176頁第177頁第178頁第179頁第180頁第181頁第182頁第183頁第184頁第185頁第186頁第187頁第188頁第189頁第190頁第191頁第192頁第193頁第194頁第195頁第196頁第197頁第198頁第199頁第200頁第201頁第202頁第203頁第204頁第205頁第206頁第207頁第208頁第209頁第210頁第211頁第212頁第213頁第214頁第215頁第216頁第217頁第218頁第219頁第220頁第221頁第222頁
Functional Description
MC68HC908QL4 MC68HC908QL3 MC68HC908QL2 Data Sheet, Rev. 4
Freescale Semiconductor
49
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 1
LSB
, is:
1
LSB
= (V
REFH
–V
REFL
) / 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 ± 1/2
LSB
in 8- or 10-bit mode. As a consequence,
however, the code width of the first ($000) conversion is only 1/2
LSB
and the code width of the last ($FF
or $3FF) is 1.5
LSB
.
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 (E
ZS
) (sometimes called offset) — This error is defined as the difference between
the actual code width of the first conversion and the ideal code width (1/2
LSB
). Note, if the first
conversion is $001, then the difference between the actual $001 code width and its ideal (1
LSB
) is
used.
Full-Scale Error (E
FS
) — This error is defined as the difference between the actual code width of
the last conversion and the ideal code width (1.5
LSB
). Note, if the last conversion is $3FE, then the
difference between the actual $3FE code width and its ideal (1
LSB
) 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 ±1/2
LSB
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.
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.
相關PDF資料 |
PDF描述 |
|---|---|
| MC908QL2C | Microcontrollers |
| MC908QL2DT | Microcontrollers |
| MC908QL2DW | Microcontrollers |
| MC908QL2M | Microcontrollers |
| MC908QL2V | Microcontrollers |
相關代理商/技術參數 |
參數描述 |
|---|---|
| MC908QL4CDTE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers |
| MC908QL4CDWE | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:M68HC08 Microcontrollers |
| MC908QL4DT | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL4DW | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
| MC908QL4M | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:Microcontrollers |
發布緊急采購，3分鐘左右您將得到回復。