參數(shù)資料
型號(hào)： AS5140H-ASST
廠商： ams
文件頁(yè)數(shù)： 30/38頁(yè)
文件大?。?/td> 1279K
描述： IC ENCODER ROTARY 10BIT 16-SSOP
標(biāo)準(zhǔn)包裝： 2,000
傳感范圍： 45mT ~ 75mT
類型： 線性，旋轉(zhuǎn)編碼器 - 可編程
電源電壓： 3 V ~ 3.6 V，4.5 V ~ 5.5 V
電流 - 電源： 21mA
電流 - 輸出（最大）： 4mA
輸出類型： 數(shù)字式，PWM，10 位串行
特點(diǎn)： 可編程
工作溫度： -40°C ~ 150°C
封裝/外殼： *
供應(yīng)商設(shè)備封裝： *
包裝： *
www.austriamicrosystems.com/AS5140H
Revision 1.4
29 - 37
AS5140H
Data Sheet - Detailed Description
Figure 23. Example of Linearity Error Over 360?/DIV>
7.12.2 Transition Noise
Transition noise is defined as the jitter in the transition between two steps. Due to the nature of the measurement principle (Hall sensors +
Preamplifier + ADC), there is always a certain degree of noise involved. This transition noise voltage results in an angular transition noise at the
outputs. It is specified as 0.06 degrees rms (1 sigma)
1
. This is the repeatability of an indicated angle at a given mechanical position. The
transition noise has different implications on the type of output that is used:
 Absolute Output; SSI Interface: The transition noise of the absolute output can be reduced by the user by applying an averaging of read-
ings. An averaging of 4 readings will reduce the transition noise by 50% = 0.03?rms (1 sigma).
 PWM Interface: If the PWM interface is used as an analog output by adding a low pass filter, the transition noise can be reduced by lower-
ing the cutoff frequency of the filter. If the PWM interface is used as a digital interface with a counter at the receiving side, the transition
noise may again be reduced by averaging of readings.
 Incremental Mode: In incremental mode, the transition noise influences the period, width and phase shift of the output signals A, B and 
Index. However, the algorithm used to generate the incremental outputs guarantees no missing or additional pulses even at high speeds (up
to 10.000 rpm and higher).
7.12.3 High Speed Operation
The AS5140H samples the angular value at a rate of 10.42k samples per second. Consequently, the incremental and the absolute outputs are
updated each by 96祍. At a stationary position of the magnet, this sampling rate creates no additional error.
Absolute Mode. With the given sampling rate of 10.4 kHz, the number of samples (n) per turn for a magnet rotating at high speed can be 
calculated by:
n =
(EQ 6)
In practice, there is no upper speed limit. The only restriction is that there will be fewer samples per revolution as the speed increases.
Regardless of the rotational speed, the absolute angular value is always sampled at the highest resolution of 10 bit. Likewise, for a given number
of samples per revolution (n), the maximum speed can be calculated by:
rpm =
(EQ 7)
1. Statistically, 1 sigma represents 68.27% of readings; 3 sigma represents 99.73% of readings.
 
 
-0.5 
-0.4
 
-0.3 
-0.2 
-0.1 
0  
0.1 
0.2 
0.3 
0.4 
0.5 
1      55    109   163   217   271   325   379   433   487   541   595   649   703   757   811   865   919   973 
transition noise 
Err 
max 
Err 
min 
60
rpm  96?/SPAN>s
?/DIV>
---------------- ---------- -
60
n  96?/SPAN>s
?/DIV>
---------------- --- -
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AS5140H-DB 制造商:ams 功能描述:AS5140H Demo Board
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