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本应用笔记合集包括68篇文章,内容涵盖仪器仪表和测量、电机控制系统设计、过程控制和工业自动化、通信、消费电子、能源、医疗保健、楼宇技术以及汽车应用等领域。文中的每款电路包含详细的设计文档,而且电路功能和性能都已经过硬件验证。 ADI应用笔记合集(上)地址:https://download.csdn.net/download/weixin_38747087/12852820
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ADI公司 编译
ADI应用笔记合集 (第1册)
AN-1285
应用笔记
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Rev. 0 | Page 1 of 12
图1. WM-Bus开发套件(含母板和子卡)
12016-001
ADF7021-N无线计量总线(WM-Bus)无线电性能(模式N)
作者:Michael Dalton
简介
本应用笔记描述ADF7021-N收发器配置为以无线计量总线
(WM-Bus)标准(文档EN 13757-4,模式N)进行工作时的无线
电性能,并重点描述适用于2.4 kbps和4.8 kbps工作模式的关
键接收器参数。这些参数是:功率范围内的包误差率(PER)、
载波频率误差范围内的灵敏度、阻塞和邻道选择性。所有
PER测试均采用ADI公司的WM-Bus开发套件执行。该开发
套件包含完整的WM-Bus堆栈,运行在Renesas RL78微处理
器上。图1显示一块母板和一块子卡,均由该开发套件提供。
AN-1049
One Technology Way P.O. Box 9106 Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 Fax: 781.461.3113 www.analog.com
iMEMS®
Harvey Weinberg
Rev. 0 | Page 1 of 2
−40°C +25°C +85°C
(V)
1.97777 2.49699 2.97868
(V)
2.34948 2.35468 2.34216
(mV)
11.9081 12.7440 13.1951
(V
0
)
(S)
ADXRS6xx
S = (V
ROTATING
- V
0
)/ (1)
V0 S
= (V
GYRO
- V
0
)/S (2)
ADXRS6xx
V0
S
(VT) A DXRS6xx
ADXRS6xx 250°/
40°/
V
P1
= V
P0
+ a(V
T1
- V
T0
) + b(V
T1
- V
T0
)
2
(3)
V
P2
= V
P0
+ a(V
T2
- V
T0
) + b(V
T2
- V
T0
)
2
(4)
V
P0
(V
T0
)
V
P1
(V
T1
)
V
P2
(V
T2
)
a b 5 6
a = (V
P1
-V
P0
)/(V
T1
- V
T0
) - b(V
T1
- V
T0
) (5)
b = [(V
P1
- V
P0
)/(V
T1
- V
T0
) - (V
P2
- V
P0
)/(V
T2
-V
T0
)]/ (V
T1
-
V
T2
) (6)
a b
−40°C +25°C +85°C
1
使用ADUX1020实现手势识别
作者:Tyler Ray
AN-1419
应用笔记
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Rev. 0 | Page 1 of 4
水平角度:
21
21
X
XX
XX
θ
+
−
=
(弧度)
垂直角度:
21
21
Y
YY
YY
θ
+
−
=
(弧度)
强度:I = X
1
+ X
2
+ Y
1
+ Y
2
(代码)
INTENSITY (CODES)
10000
8000
6000
4000
2000
0
0.70.60.50.40.3
TIME (Seconds)
0.20.10
X
1
X
2
Y
1
Y
2
14881
-001
图1. 强度和时间,ADUX1020 的原始数据输出
ANGLE (Degrees)
10
5
0
–5
–10
0.70.60.50.40.3
TIME (Seconds)
0.20.10
θ
X
=
θ
Y
=
X
1
– X
2
X
1
+ X
2
Y
1
– Y
2
Y
1
+ Y
2
14881
-002
图2. 角度和时间,ADUX1020 的角度计算
简介
ADUX1020是一款集成式光学传感器和前端器件,能够进
行高级单点手势识别和近距检测。光学传感器可灵敏感测
入射光的强度和角度。通过光学和电子的环境光过滤,它
能够在各种嘈声环境中持续稳定工作。该芯片有多种模式
配置,以实现非接触式手势识别和控制,还能实现距离
检测。
手势识别基础
ADUX1020能够灵敏感测入射光的角度,因此该芯片只需
使用集成式光学传感器和单个外部LED即可检测手势。当
设置为采样模式时,它可从芯片上的四个输出通道计算入
射光的角度。必须使用以下程序来实现手势识别功能:
1. 在ADUX1020工作之前,校准时钟。有关如何校准32 kHz
和32 MHz时钟的信息,请参见ADUX1020数据手册。
2. 通过将 0x3 写入寄存器 0x45 的位 [3:0],将ADUX1020工
作模式设置为采样模式。
3. 收集器件测量的数据。有关如何使用先进先出(FIFO)和
中断从寄存器读取数据的说明,请查看ADUX1020数据
手册。数据可直接从数据寄存器读取,或从寄存器0x60
位[15:0]中的64字节FIFO读取。
4. 利用ADUX1020四个输出通道中的数据计算入射光的角
度。收集通道X
1
、通道X
2
、通道Y
1
和通道Y
2
数据 之后,
按照以下公式计算角度和强度:
数据示例如图1和图2所示。
(下)
仪器仪表和测量
AD8436真均方根-直流(RMS-TO-DC)转换器 (AN-1341) ..........................................................................................................................5
面向可调低压差稳压器的降噪网络 (AN-1329) .........................................................................................................................................20
产生故障保护开关的副故障电源 (AN-1380)..............................................................................................................................................27
由单一输入电压实现分离供电轨的改进拓扑结构 (AN-1106)...............................................................................................................32
如何运用DC-DC升压调节器 (AN-1132)......................................................................................................................................................41
如何运用DC-DC降压调节器 (AN-1125)......................................................................................................................................................45
低压差(LDO)调节器的噪声源 (AN-1120) ...................................................................................................................................................52
降压调节器的印刷电路板布局布线指南,针对采用双通道开关控制器的低噪声设计而优化 (AN-1119)................................61
高速差分ADC驱动器设计考虑 (AN-1026)..................................................................................................................................................65
利用AD5370清零至任意电压 (AN-1036).....................................................................................................................................................77
用于ADI公司低失真引脚排列运算放大器的有源滤波器评估板 (AN-0993)......................................................................................79
用于标准SOIC运算放大器的有源滤波器评估板 (AN-0991) ..................................................................................................................80
用于差分放大器的有源滤波器评估板 (AN-0992).....................................................................................................................................81
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)........................................................82
应用ADA4177系列输入过压保护运算放大器的实际设计考虑 (AN-1387).........................................................................................86
高电压D类放大器的输出电流监控 (AN-1375)...........................................................................................................................................90
最低噪声的零漂移放大器提供5.6 nV/√Hz电压噪声密度 (AN-1114)...................................................................................................95
在系统中成功运用低压差稳压器 (AN-1072)............................................................................................................................................102
使用加速度计进行倾斜检测 (AN-1057).....................................................................................................................................................108
基于MMSE的触摸英语多点校准算法 (AN-1021)....................................................................................................................................115
数字滤波器的选择:AD7190、AD7192 (AN-0979)................................................................................................................................125
电机控制系统设计
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................129
使用ADSP-CM402F/ADSP-CM403F/ADSP-CM407F/ADSP-CM408F SINC滤波器和
AD7401A实现隔离式电机控制反馈 (AN-1265) .......................................................................................................................................143
使用ADSP-CM408F ADC控制器的电机控制反馈采样时序 (AN-1267) .............................................................................................158
电流检测放大器共模阶跃响应 (AN-1308) ................................................................................................................................................175
轻松实现复杂的电源时序控制 (AN-1311) ................................................................................................................................................180
采用ADP2441/ADP2442同步降压DC-DC稳压器设计反相电源 (AN-1269)......................................................................................185
过程控制和工业自动化
应用ADA4177系列输入过压保护运算放大器的实际设计考虑 (AN-1387) .......................................................................................107
AD7192在电子秤应用中的辐射抗扰度性能 (AN-1186).........................................................................................................................226
AD7780在电子秤应用中的辐射抗扰度性能 (AN-1187).........................................................................................................................242
EMC兼容RS-485通信网络 (AN-1161).........................................................................................................................................................254
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................270
LVDS和M-LVDS电路实施指南 (AN-1177) ................................................................................................................................................274
在减少应力的同时获得更大升压:SEPIC乘法升压转换器 (AN-1126) .............................................................................................286
控制器局域网(CAN)实施指南 (AN-1123).................................................................................................................................................302
用开关调节器为双电源精密ADC供电 (AN-1141)...................................................................................................................................318
调整AD5362的输出范围和跨度 (AN-0986)...............................................................................................................................................326
通信
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................270
ADF7021-N无线计量总线(WM-Bus)无线电性能(模式N) (AN-1285).................................................................................................328
ADF7023上的滚动数据缓冲器 (AN-1275).................................................................................................................................................340
ADF7023和ADF7023-J的嵌入式数据包误差率测试 (AN-1276) ...........................................................................................................344
ADF7021、ADF7021-N和ADF7021-V的镜像抑制校准 (AN-1258) .....................................................................................................348
了解ADF7021的AFC环路并为实现最小前同步码长度而进行优化 (AN-1182) ...............................................................................360
LVDS和M-LVDS电路实施指南 (AN-1177) ................................................................................................................................................274
由单一输入电压实现分离供电轨的改进拓扑结构 (AN-1106)...............................................................................................................35
在减少应力的同时获得更大升压:SEPIC乘法升压转换器 (AN-1126) .............................................................................................286
采用恒定负渗漏电流优化ADF4157和ADF4158 PLL的相位噪声和杂散性能 (AN-1154)...............................................................368
ADP1047/ADP1048的先进功率计量功能 (AN-1145)..............................................................................................................................376
控制器局域网(CAN)实施指南 (AN-1123).................................................................................................................................................302
无线发射机IQ平衡和边带抑制 (AN-1100)................................................................................................................................................388
AD9552:适合网络时钟应用的可编程晶振 (AN-0988).........................................................................................................................396
TD-SCMA多载波系统可行性研究 (AN-0974)..........................................................................................................................................404
RF功率校准提高无线发射机的性能 (AN-1040).......................................................................................................................................432
在点对点微波发射系统中使用正交数字上变频器(QDUC)的优势 (AN-0996) ................................................................................440
零延迟时钟定时技术简介 (AN-0983).........................................................................................................................................................448
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)......................................................103
通信系统中接收链的差分滤波器设计 (AN-1364)...................................................................................................................................456
消费电子
面向可调低压差稳压器的降噪网络 (AN-1329) .........................................................................................................................................21
高电压D类放大器的输出电流监控 (AN-1375).........................................................................................................................................111
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................466
能源
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................157
ADE9078用于无电压检测的低功耗模式 (AN-1415)...............................................................................................................................470
医疗保健
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)......................................................103
楼宇技术
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................466
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................157
汽车应用
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................270
校准iMEMS®陀螺仪 (AN-1049) ....................................................................................................................................................................473
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................466
目录
仪器仪表和测量
AD8436真均方根-直流(RMS-TO-DC)转换器 (AN-1341) ..........................................................................................................................5
面向可调低压差稳压器的降噪网络 (AN-1329) .........................................................................................................................................21
产生故障保护开关的副故障电源 (AN-1380)..............................................................................................................................................29
由单一输入电压实现分离供电轨的改进拓扑结构 (AN-1106)...............................................................................................................35
如何运用DC-DC升压调节器 (AN-1132)......................................................................................................................................................47
如何运用DC-DC降压调节器 (AN-1125)......................................................................................................................................................51
低压差(LDO)调节器的噪声源 (AN-1120) ...................................................................................................................................................59
降压调节器的印刷电路板布局布线指南,针对采用双通道开关控制器的低噪声设计而优化 (AN-1119)................................71
高速差分ADC驱动器设计考虑 (AN-1026)..................................................................................................................................................79
利用AD5370清零至任意电压 (AN-1036).....................................................................................................................................................95
用于ADI公司低失真引脚排列运算放大器的有源滤波器评估板 (AN-0993)......................................................................................97
用于标准SOIC运算放大器的有源滤波器评估板 (AN-0991) ..................................................................................................................99
用于差分放大器的有源滤波器评估板 (AN-0992)...................................................................................................................................101
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)......................................................103
应用ADA4177系列输入过压保护运算放大器的实际设计考虑 (AN-1387) .......................................................................................107
高电压D类放大器的输出电流监控 (AN-1375).........................................................................................................................................111
最低噪声的零漂移放大器提供5.6 nV/√Hz电压噪声密度 (AN-1114).................................................................................................117
在系统中成功运用低压差稳压器 (AN-1072)............................................................................................................................................125
使用加速度计进行倾斜检测 (AN-1057).....................................................................................................................................................133
基于MMSE的触摸英语多点校准算法 (AN-1021)....................................................................................................................................141
数字滤波器的选择:AD7190、AD7192 (AN-0979)................................................................................................................................153
电机控制系统设计
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................157
使用ADSP-CM402F/ADSP-CM403F/ADSP-CM407F/ADSP-CM408F SINC滤波器和
AD7401A实现隔离式电机控制反馈 (AN-1265) .......................................................................................................................................172
使用ADSP-CM408F ADC控制器的电机控制反馈采样时序 (AN-1267) .............................................................................................188
电流检测放大器共模阶跃响应 (AN-1308) ................................................................................................................................................206
轻松实现复杂的电源时序控制 (AN-1311) ................................................................................................................................................212
采用ADP2441/ADP2442同步降压DC-DC稳压器设计反相电源 (AN-1269)......................................................................................218
过程控制和工业自动化
应用ADA4177系列输入过压保护运算放大器的实际设计考虑 (AN-1387) .........................................................................................86
AD7192在电子秤应用中的辐射抗扰度性能 (AN-1186).........................................................................................................................192
AD7780在电子秤应用中的辐射抗扰度性能 (AN-1187).........................................................................................................................204
EMC兼容RS-485通信网络 (AN-1161).........................................................................................................................................................215
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................228
LVDS和M-LVDS电路实施指南 (AN-1177) ................................................................................................................................................232
在减少应力的同时获得更大升压:SEPIC乘法升压转换器 (AN-1126) .............................................................................................242
控制器局域网(CAN)实施指南 (AN-1123).................................................................................................................................................257
用开关调节器为双电源精密ADC供电 (AN-1141)...................................................................................................................................270
调整AD5362的输出范围和跨度 (AN-0986)...............................................................................................................................................277
通信
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................228
ADF7021-N无线计量总线(WM-Bus)无线电性能(模式N) (AN-1285).................................................................................................279
ADF7023上的滚动数据缓冲器 (AN-1275).................................................................................................................................................289
ADF7023和ADF7023-J的嵌入式数据包误差率测试 (AN-1276) ...........................................................................................................292
ADF7021、ADF7021-N和ADF7021-V的镜像抑制校准 (AN-1258) .....................................................................................................295
了解ADF7021的AFC环路并为实现最小前同步码长度而进行优化 (AN-1182) ...............................................................................305
LVDS和M-LVDS电路实施指南 (AN-1177) ................................................................................................................................................232
由单一输入电压实现分离供电轨的改进拓扑结构 (AN-1106)...............................................................................................................32
在减少应力的同时获得更大升压:SEPIC乘法升压转换器 (AN-1126) .............................................................................................242
采用恒定负渗漏电流优化ADF4157和ADF4158 PLL的相位噪声和杂散性能 (AN-1154)...............................................................311
ADP1047/ADP1048的先进功率计量功能 (AN-1145)..............................................................................................................................315
控制器局域网(CAN)实施指南 (AN-1123).................................................................................................................................................257
无线发射机IQ平衡和边带抑制 (AN-1100)................................................................................................................................................323
AD9552:适合网络时钟应用的可编程晶振 (AN-0988).........................................................................................................................330
TD-SCMA多载波系统可行性研究 (AN-0974)..........................................................................................................................................337
RF功率校准提高无线发射机的性能 (AN-1040).......................................................................................................................................363
在点对点微波发射系统中使用正交数字上变频器(QDUC)的优势 (AN-0996) ................................................................................370
零延迟时钟定时技术简介 (AN-0983).........................................................................................................................................................376
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)........................................................82
通信系统中接收链的差分滤波器设计 (AN-1364)...................................................................................................................................382
消费电子
面向可调低压差稳压器的降噪网络 (AN-1329) .........................................................................................................................................21
高电压D类放大器的输出电流监控 (AN-1375).........................................................................................................................................111
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................466
能源
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................157
ADE9078用于无电压检测的低功耗模式 (AN-1415)...............................................................................................................................470
医疗保健
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)......................................................103
楼宇技术
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................466
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................157
汽车应用
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................270
校准iMEMS®陀螺仪 (AN-1049) ....................................................................................................................................................................473
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................466
仪器仪表和测量
AD8436真均方根-直流(RMS-TO-DC)转换器 (AN-1341) ..........................................................................................................................5
面向可调低压差稳压器的降噪网络 (AN-1329) .........................................................................................................................................21
产生故障保护开关的副故障电源 (AN-1380)..............................................................................................................................................29
由单一输入电压实现分离供电轨的改进拓扑结构 (AN-1106)...............................................................................................................35
如何运用DC-DC升压调节器 (AN-1132)......................................................................................................................................................47
如何运用DC-DC降压调节器 (AN-1125)......................................................................................................................................................51
低压差(LDO)调节器的噪声源 (AN-1120) ...................................................................................................................................................59
降压调节器的印刷电路板布局布线指南,针对采用双通道开关控制器的低噪声设计而优化 (AN-1119)................................71
高速差分ADC驱动器设计考虑 (AN-1026)..................................................................................................................................................79
利用AD5370清零至任意电压 (AN-1036).....................................................................................................................................................95
用于ADI公司低失真引脚排列运算放大器的有源滤波器评估板 (AN-0993)......................................................................................97
用于标准SOIC运算放大器的有源滤波器评估板 (AN-0991) ..................................................................................................................99
用于差分放大器的有源滤波器评估板 (AN-0992)...................................................................................................................................101
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)......................................................103
应用ADA4177系列输入过压保护运算放大器的实际设计考虑 (AN-1387) .......................................................................................107
高电压D类放大器的输出电流监控 (AN-1375).........................................................................................................................................111
最低噪声的零漂移放大器提供5.6 nV/√Hz电压噪声密度 (AN-1114).................................................................................................117
在系统中成功运用低压差稳压器 (AN-1072)............................................................................................................................................125
使用加速度计进行倾斜检测 (AN-1057).....................................................................................................................................................133
基于MMSE的触摸英语多点校准算法 (AN-1021)....................................................................................................................................141
数字滤波器的选择:AD7190、AD7192 (AN-0979)................................................................................................................................153
电机控制系统设计
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................157
使用ADSP-CM402F/ADSP-CM403F/ADSP-CM407F/ADSP-CM408F SINC滤波器和
AD7401A实现隔离式电机控制反馈 (AN-1265) .......................................................................................................................................172
使用ADSP-CM408F ADC控制器的电机控制反馈采样时序 (AN-1267) .............................................................................................188
电流检测放大器共模阶跃响应 (AN-1308) ................................................................................................................................................206
轻松实现复杂的电源时序控制 (AN-1311) ................................................................................................................................................212
采用ADP2441/ADP2442同步降压DC-DC稳压器设计反相电源 (AN-1269)......................................................................................218
过程控制和工业自动化
应用ADA4177系列输入过压保护运算放大器的实际设计考虑 (AN-1387) .......................................................................................107
AD7192在电子秤应用中的辐射抗扰度性能 (AN-1186).........................................................................................................................226
AD7780在电子秤应用中的辐射抗扰度性能 (AN-1187).........................................................................................................................242
EMC兼容RS-485通信网络 (AN-1161).........................................................................................................................................................254
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................270
LVDS和M-LVDS电路实施指南 (AN-1177) ................................................................................................................................................274
在减少应力的同时获得更大升压:SEPIC乘法升压转换器 (AN-1126) .............................................................................................286
控制器局域网(CAN)实施指南 (AN-1123).................................................................................................................................................302
用开关调节器为双电源精密ADC供电 (AN-1141)...................................................................................................................................318
调整AD5362的输出范围和跨度 (AN-0986)...............................................................................................................................................326
通信
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................270
ADF7021-N无线计量总线(WM-Bus)无线电性能(模式N) (AN-1285).................................................................................................328
ADF7023上的滚动数据缓冲器 (AN-1275).................................................................................................................................................340
ADF7023和ADF7023-J的嵌入式数据包误差率测试 (AN-1276) ...........................................................................................................344
ADF7021、ADF7021-N和ADF7021-V的镜像抑制校准 (AN-1258) .....................................................................................................348
了解ADF7021的AFC环路并为实现最小前同步码长度而进行优化 (AN-1182) ...............................................................................360
LVDS和M-LVDS电路实施指南 (AN-1177) ................................................................................................................................................274
由单一输入电压实现分离供电轨的改进拓扑结构 (AN-1106)...............................................................................................................35
在减少应力的同时获得更大升压:SEPIC乘法升压转换器 (AN-1126) .............................................................................................286
采用恒定负渗漏电流优化ADF4157和ADF4158 PLL的相位噪声和杂散性能 (AN-1154)...............................................................368
ADP1047/ADP1048的先进功率计量功能 (AN-1145)..............................................................................................................................376
控制器局域网(CAN)实施指南 (AN-1123).................................................................................................................................................302
无线发射机IQ平衡和边带抑制 (AN-1100)................................................................................................................................................388
AD9552:适合网络时钟应用的可编程晶振 (AN-0988).........................................................................................................................396
TD-SCMA多载波系统可行性研究 (AN-0974)..........................................................................................................................................404
RF功率校准提高无线发射机的性能 (AN-1040).......................................................................................................................................432
在点对点微波发射系统中使用正交数字上变频器(QDUC)的优势 (AN-0996) ................................................................................440
零延迟时钟定时技术简介 (AN-0983).........................................................................................................................................................448
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)......................................................103
通信系统中接收链的差分滤波器设计 (AN-1364)...................................................................................................................................456
消费电子
面向可调低压差稳压器的降噪网络 (AN-1329) .........................................................................................................................................20
高电压D类放大器的输出电流监控 (AN-1375)...........................................................................................................................................90
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................391
能源
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................129
ADE9078用于无电压检测的低功耗模式 (AN-1415)...............................................................................................................................395
医疗保健
如何预测直接数字频率合成器(DDS)输出频谱中主相位截断杂散的频率和幅度 (AN-1396)........................................................82
楼宇技术
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................391
利用反激、SEPIC和Cuk组合为IGBT电机驱动产生多个隔离偏置轨 (AN-1316) ............................................................................129
汽车应用
如何为ADF4355-2设置VCO旁路校准 (AN-1381)....................................................................................................................................228
校准iMEMS®陀螺仪 (AN-1049) ....................................................................................................................................................................398
使用ADUX1020实现手势识别 (AN-1419) .................................................................................................................................................391
One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com
Page 204
AD7780在电子秤应用中的辐射抗扰度性能
作者:Mary McCarthy和Li Ke
简介
AD7780是一款包含PGA的低噪声、低功耗、24位Σ-Δ型转
换器。AD7780用于低端到中端的电子秤系统。作为发布过
程的一部分,测试了电子秤系统的辐射抗扰度。本应用笔
记介绍如何实现AD7780的最佳抗辐射性能,在设计印刷电
路板(PCB)的过程中考虑了电路板布局和元件放置的影
响。根据IEC 61000-4-3标准对整套系统(ADC、PCB和称重
传感器)进行了辐射抗扰度测试。
辐射抗扰度
辐射抗扰度测试按照IEC 61000-4-3标准中的说明进行。磁
场强度为10 V/m,RF频率从80 MHz扫至1 GHz。根据规范,
器件的分类如下:
• A类:在制造商、请求者或购买者指定的限制范围内性
能正常。
• B类:暂时丧失功能或性能暂时降低,这种现象在干扰
停止后消失,然后受测设备就会恢复正常性能,无需操
作人员介入。
• C类:暂时丧失功能或性能暂时降低,需要操作人员介
入才能解决此问题。
• D类:因为硬件或软件损坏或者数据丢失而导致功能丧
失或性能降低,并且无法恢复。
ADC在频率扫描期间持续转换。本应用笔记中通篇提到的
误差是指有RF频率和没有RF频率时的ADC转换之间的最
大偏差。
要让一套电子秤系统算得上A类,那么存在RF干扰时允许
的误差e为
其中n为电子秤系统的计数次数。
± 称重传感器的最大输出电压
=
(2 × 计数次数)
±满量程输出
2n
AN-1187
应用笔记
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