标题: AD7176-2 AD8475 ADR445 24 位、250 kSPS 单电源数据采集系统设计 [打印本页]
作者: happy112    时间: 2016-6-19 14:41
标题: AD7176-2 AD8475 ADR445 24 位、250 kSPS 单电源数据采集系统设计

实物图：


对工业电平信号进行采样时，必须提供快速高分辨率转换 信息。通常，当采样速率达到500 kSPS时，模数转换器(ADC) 的分辨率可为14位至18位。如图所示电路是一款针对工业 电平信号采样进行优化的单电源系统，采用一个24位、 250 kSPS∑-△型ADC芯片AD7176-2。两个差分通道或四个伪差分通道中的 每一个都能够在采样率为50kSPS时提供17.2位的无噪声代 码分辨率。
本电路利用内置激光微调电阻的创新型差分放大器实现衰 减和电平转换，利用低电源电压的精密ADC可以解决获取 ±5 V、±10 V和0 V至10 V的标准工业电平信号并进行数字 化处理的问题。本电路可应用于过程控制(PLC/DCS模 块)、医疗以及科学多通道仪器和色谱仪。


电路原理图：



BOM表（完整版见附件）：
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


全部资料（压缩包）下载：




24 位、250 kSPS 单电源数据采集系统设计.pdf

394.44 KB, 下载次数: 11, 下载积分: 黑币 -5

BOM表.zip

32.47 KB, 下载次数: 7, 下载积分: 黑币 -5

原理图、PCB板、gerber工程文件.zip

1.45 MB, 下载次数: 12, 下载积分: 黑币 -5

原理图、元件布局图PDF文件.zip

2.06 MB, 下载次数: 11, 下载积分: 黑币 -5

作者: woyaodwn    时间: 2025-3-2 23:04
这个可以实现吗？



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