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AD7176-2 AD8475 ADR445 24 位、250 kSPS 單電源數(shù)據(jù)采集系統(tǒng)設(shè)計(jì)

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ID:124161 發(fā)表于 2016-6-19 14:41 | 顯示全部樓層 |閱讀模式

實(shí)物圖：
0.png

對(duì)工業(yè)電平信號(hào)進(jìn)行采樣時(shí)，必須提供快速高分辨率轉(zhuǎn)換 信息。通常，當(dāng)采樣速率達(dá)到500 kSPS時(shí)，模數(shù)轉(zhuǎn)換器(ADC) 的分辨率可為14位至18位。如圖所示電路是一款針對(duì)工業(yè) 電平信號(hào)采樣進(jìn)行優(yōu)化的單電源系統(tǒng)，采用一個(gè)24位、 250 kSPS∑-△型ADC芯片AD7176-2。兩個(gè)差分通道或四個(gè)偽差分通道中的 每一個(gè)都能夠在采樣率為50kSPS時(shí)提供17.2位的無(wú)噪聲代 碼分辨率。
本電路利用內(nèi)置激光微調(diào)電阻的創(chuàng)新型差分放大器實(shí)現(xiàn)衰 減和電平轉(zhuǎn)換，利用低電源電壓的精密ADC可以解決獲取 ±5 V、±10 V和0 V至10 V的標(biāo)準(zhǔn)工業(yè)電平信號(hào)并進(jìn)行數(shù)字 化處理的問(wèn)題。本電路可應(yīng)用于過(guò)程控制(PLC/DCS模 塊)、醫(yī)療以及科學(xué)多通道儀器和色譜儀。


電路原理圖：
0.png


BOM表（完整版見(jiàn)附件）：
A0
SMB
SMA
No
Top
Straight PCB  Mount SMB Jack,  keep hole clear of  solder
Tyco
1-1337482-0
Do Not Insert.  Keep clear of solder.
A1
SMB
SMA
No
Top
Straight PCB Mount  SMB Jack,  keep hole clear of solder
Tyco
1-1337482-0
Do Not Insert. Keep  clear of solder.
A2
SMB
SMA
No
Top
Straight PCB Mount  SMB Jack,  keep hole clear of solder
Tyco
1-1337482-0
Do Not Insert. Keep  clear of solder.
A3
SMB
SMA
No
Top
Straight PCB Mount  SMB Jack,  keep hole clear of solder
Tyco
1-1337482-0
Do Not Insert. Keep  clear of solder.
A4
SMB
SMA
No
Top
Straight PCB Mount  SMB Jack,  keep hole clear of solder
Tyco
1-1337482-0
Do Not Insert. Keep  clear of solder.
A5
SMB
DNI
SMA
No
Top
Straight PCB Mount  SMB Jack,  keep hole clear of solder
Tyco
1-1337482-0
Do Not Insert. Keep  clear of solder.
A6
SMB
DNI
SMA
No
Top
Straight PCB Mount  SMB Jack,  keep hole clear of solder
Tyco
1-1337482-0
Do Not Insert. Keep  clear of solder.
AIN0
TESTPOINTS
DNI
TESTPOINT-SMALL
No
Top
Test point, not  inserted, keep hole clear of solder
n/a
n/a
Do Not Insert. Keep  clear of solder.
AIN1
TESTPOINTS
DNI
TESTPOINT-SMALL
No
Top
Test point, not  inserted, keep hole clear of solder
n/a
n/a
Do Not Insert. Keep  clear of solder.
AIN2
TESTPOINTS
DNI
TESTPOINT-SMALL
No
Top
Test point, not  inserted, keep hole clear of solder
n/a
n/a
Do Not Insert. Keep  clear of solder.
AIN3
TESTPOINTS
DNI
TESTPOINT-SMALL
No
Top
Test point, not  inserted, keep hole clear of solder
n/a
n/a
Do Not Insert. Keep  clear of solder.
AIN4
TESTPOINTS
DNI
TESTPOINT-SMALL
No
Top
Test point, not  inserted, keep hole clear of solder
n/a
n/a
Do Not Insert. Keep  clear of solder.
AIN4'
TESTPOINTS
DNI
TESTPOINT-SMALL
No
Top
Test point, not  inserted, keep hole clear of solder
n/a
n/a
Do Not Insert. Keep  clear of solder.
C1
CAP
4.7uF
±10%
C0603
Yes
Top
Capacitor ceramic,  6.3V, X5R, 0603
Murata
GRM188R60J475K
FEC 173-5527
C2
CAP
0.1uF
±10%
C0603
Yes
Top
Capacitor ceramic,  50V, X7R, 0603
Murata
GRM188R71H104K
FEC 882-0023
C3
CAP
4.7uF
±10%
C0603
Yes
Top
Capacitor ceramic,  10V, X5R, 0603
Kemet
C0603C475K8PACTU
FEC 157-2625
C4
CAP
1uF
±10%
C0805
Yes
Top
CAPACITOR, 0805, 1UF,  50V, X7R
MURATA
GRM21BR71H105KA12L
FEC 1735541
C5
CAP
DNI
TBD
C0402
Yes
Top
Ceramic Capacitor,  not inserted, 0402
n/a
n/a
Do Not Insert
C6
CAP
1uF
±10%
C0805
Yes
Top
CAPACITOR, 0805, 1UF,  50V, X7R
MURATA
GRM21BR71H105KA12L
FEC 1735541
C7
CAP
DNI
TBD
C0402
Yes
Bottom
Ceramic Capacitor,  not inserted, 0402
n/a
n/a
Do Not Insert
C8
CAP
DNI
TBD
C0402
Yes
Top
Ceramic Capacitor,  not inserted, 0402
n/a
n/a
Do Not Insert
C9
CAP
DNI
TBD
C0402
Yes
Top
Ceramic Capacitor,  not inserted, 0402
n/a
n/a
Do Not Insert
C10
CAP
DNI
TBD
C0402
Yes
Top
Ceramic Cap XTAL, not  inserted, 0402
n/a
n/a
Do Not Insert
C11
CAP
DNI
TBD
C0402
Yes
Top
Ceramic Cap XTAL, not  inserted, 0402
n/a
n/a
Do Not Insert
C12
CAP
0.1uF
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C13
CAP
0.1uF
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C14
CAP
0.1uF
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C15
CAP
1uF
±10%
C0603
Yes
Bottom
CAPACITOR, 0603, 1UF,  6.3V
Murata
GRM188R70J105KA01D
FEC 184-5765
C16
CAP
DNI
TBD
C0402
Yes
Top
Ceramic Capacitor,  not inserted, 0402
n/a
n/a
Do Not Insert
C17
CAP
4.7uF
±10%
C0603
Yes
Top
Capacitor ceramic,  6.3V, X5R, 0603
Murata
GRM188R60J475K
FEC 173-5527
C18
CAP
0.1uF
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C19
CAP
270pF
±5%
C0603
Yes
Top
Ceramic Capacitor,  50V, C0G/NPO, 0603
AVX
06035A271JAT2A
FEC 1734627
C20
CAP
0.1uF
±10%
C0402
Yes
Bottom
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C21
CAP
0.1uF
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C22
CAP
0.1uF
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C23
CAP
680pF
±5%
C0603
Yes
Top
Ceramic Capacitor,  50V, NPO, 0603
KEMET
C0603C681J5GACTU
FEC 1414648
C24
CAP
DNI
TBD
C0402
Yes
Top
Ceramic Capacitor,  not inserted, 0402
n/a
n/a
Do Not Insert
C25
CAP
DNI
TBD
C0603
Yes
Top
Ceramic Capacitor,  not inserted, 0402
n/a
n/a
Do Not Insert
C26
CAP
680pF
±5%
C0603
Yes
Top
Ceramic Capacitor,  50V, NPO, 0603
Kemet
C0603C681J5GACTU
FEC 1414648
C27
CAP
270pF
±5%
C0603
Yes
Top
Ceramic Capacitor,  50V, C0G/NPO, 0603
AVX
06035A271JAT2A
FEC 1734627
C28
CAP
270pF
±5%
C0603
Yes
Top
Ceramic Capacitor,  50V, C0G/NPO, 0603
AVX
06035A271JAT2A
FEC 1734627
C29
CAP
4.7uF
±10%
C0603
Yes
Top
Capacitor ceramic,  6.3V, X5R, 0603
Murata
GRM188R60J475K
FEC 173-5527
C30
CAP
4.7uF
±10%
C0603
Yes
Top
Capacitor ceramic,  6.3V, X5R, 0603
Murata
GRM188R60J475K
FEC 173-5527
C31
CAP
DNI
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
Do Not Insert
C32
CAP
10uF
tba
1210
Yes
Top
Capacitor ceramic,  50V, X5R, 1210
Murata
GRM32ER61H106K
FEC 184-5764
C33
CAP
0.1uF
±10%
C0402
Yes
Top
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742
C34
CAP
0.1uF
±10%
C0402
Yes
Bottom
Capacitor ceramic,  16V, X7R, 0402
Murata
GRM155R71C104K
FEC 881-9742


全部資料（壓縮包）下載：




24 位、250 kSPS 單電源數(shù)據(jù)采集系統(tǒng)設(shè)計(jì).pdf

394.44 KB, 下載次數(shù): 11, 下載積分: 黑幣 -5

BOM表.zip

32.47 KB, 下載次數(shù): 7, 下載積分: 黑幣 -5

原理圖、PCB板、gerber工程文件.zip

1.45 MB, 下載次數(shù): 12, 下載積分: 黑幣 -5

原理圖、元件布局圖PDF文件.zip

2.06 MB, 下載次數(shù): 11, 下載積分: 黑幣 -5

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ID:462629 發(fā)表于 2025-3-2 23:04 | 顯示全部樓層
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