công cụ tìm kiếm bảng dữ liệu linh kiện điện tử
  Vietnamese  ▼
ALLDATASHEET.VN

X  

Preview PDF HTML

AN3137 bảng dữ liệu(PDF) 31 Page - STMicroelectronics

tên linh kiện AN3137
Giải thích chi tiết về linh kiện  Analog-to-digital converter on STM8L and STM8AL devices
PDF  42 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
nhà sản xuất  STMICROELECTRONICS [STMicroelectronics]
Trang chủ  http://www.st.com
Logo STMICROELECTRONICS - STMicroelectronics

AN3137 bảng dữ liệu(HTML) 31 Page - STMicroelectronics

Back Button AN3137 Datasheet HTML 27Page - STMicroelectronics AN3137 Datasheet HTML 28Page - STMicroelectronics AN3137 Datasheet HTML 29Page - STMicroelectronics AN3137 Datasheet HTML 30Page - STMicroelectronics AN3137 Datasheet HTML 31Page - STMicroelectronics AN3137 Datasheet HTML 32Page - STMicroelectronics AN3137 Datasheet HTML 33Page - STMicroelectronics AN3137 Datasheet HTML 34Page - STMicroelectronics AN3137 Datasheet HTML 35Page - STMicroelectronics Next Button
Zoom Inzoom in Zoom Outzoom out
 31 / 42 page
background image
AN3137
Methods for precision improvement
Doc ID 16983 Rev 3
31/42
where Ulsb ..... 0.5 lsb voltage level
Qcharging = Qdischarging
After simplification, we obtain the final formula for the required waiting time between
conversions:
This final formula links the external capacitor Cext and the required waiting time between two
conversions if the precision Ulsb is needed.
From the same formula you can see that the argument in logarithm must be positive and
therefore there is a condition for the minimal value of Cext:
Choosing a larger Cext decreases more the time between conversions (tC).
An extra large Cext (Cext>>Csh
U
max
U
lsb
--------------
⋅
) enables sampling more often.
However, increasing Cext limits the frequency bandwidth of measurement signal (increasing
the “external” timing constant Rin . Cext).
The formulas below show how to choose the optimal Cext value: signal bandwidth in
correlation with sample time. Signal bandwidth is characterized by an “external” timing
constant, so:
C
sh
U
max
⋅
U
lsb
R
in
-----------
e
t
R
in Cext
-------------------
t
d
0
t
C
∫
⋅
=
t
C
R
in
C
ext
⋅
()
–
In 1
C
sh
C
ext
-----------
U
max
U
lsb
--------------
–
⋅
=
1
C
sh
C
ext
-----------
U
max
U
lsb
--------------
–
0
>
1
C
sh
C
ext
-----------
U
max
U
lsb
--------------
>
C
ext
C
sh
U
max
U
lsb
--------------
⋅
>
R
in
C
ext
⋅
()
t
C
=
R
in
C
ext
⋅
()
R
in
C
ext
⋅
()
–
In 1
C
sh
C
ext
-----------
U
max
U
lsb
--------------
–
⋅
=



Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42


bảng dữ liệu tải về

Go To PDF Page


Link URL



Cho đến nay ALLDATASHEET có giúp ích cho doanh nghiệp của bạn hay không?  [ DONATE ] 

Alldatasheet là   |   Quảng cáo   |   Liên lạc với chúng tôi   |   Chính sách bảo mật   |   Liên kết đến bảng dữ liệu    |   Trao đổi link   |   Tìm kiếm theo nhà sản xuất
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com