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AD637BRZ PDF预览

AD637BRZ

更新时间: 2024-02-27 15:09:39
品牌 Logo 应用领域
亚德诺 - ADI 转换器模拟特殊功能转换器光电二极管
页数 文件大小 规格书
20页 613K
描述
High Precision, Wideband RMS-to-DC Converter

AD637BRZ 技术参数

是否Rohs认证: 不符合生命周期:Obsolete
零件包装代码:DIP包装说明:CERDIP-14
针数:14Reach Compliance Code:not_compliant
ECCN代码:EAR99HTS代码:8542.39.00.01
风险等级:5.08Is Samacsys:N
转换器类型:RMS TO DC CONVERTERJESD-30 代码:R-GDIP-T14
JESD-609代码:e0长度:19.43 mm
最大线性误差 (EL):0.05%最大负电源电压:-18 V
最小负电源电压:-3 V标称负供电电压:-15 V
功能数量:1端子数量:14
最大工作频率:0.15 MHz最高工作温度:125 °C
最低工作温度:-55 °C封装主体材料:CERAMIC, GLASS-SEALED
封装代码:DIP封装等效代码:DIP14,.3
封装形状:RECTANGULAR封装形式:IN-LINE
峰值回流温度(摄氏度):NOT SPECIFIED最大正输入电压:7 V
电源:+-15 V认证状态:Not Qualified
座面最大高度:5.08 mm子类别:Analog Special Function Converters
最大压摆率:3 mA最大供电电压:18 V
最小供电电压:3 V标称供电电压:15 V
表面贴装:NO温度等级:MILITARY
端子面层:Tin/Lead (Sn/Pb)端子形式:THROUGH-HOLE
端子节距:2.54 mm端子位置:DUAL
处于峰值回流温度下的最长时间:NOT SPECIFIED最大总误差:0.7%
宽度:7.62 mmBase Number Matches:1

AD637BRZ 数据手册

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High Precision, Wideband  
RMS-to-DC Converter  
AD637  
FUNCTIONAL BLOCK DIAGRAM  
FEATURES  
High accuracy  
0.02% maximum nonlinearity, 0 V to 2 V rms input  
0.10% additional error to crest factor of 3  
Wide bandwidth  
8 MHz at 2 V rms input  
600 kHz at 100 mV rms  
BUFF IN  
BUFF  
OUT  
25k  
RMS OUT  
ABSOLUTE  
VALUE  
SQUARER/  
DIVIDER  
V
IN  
Computes  
True rms  
Square  
C
25kΩ  
AV  
DEN INPUT  
dB OUTPUT  
Mean square  
Absolute value  
dB output (60 dB range)  
OUTPUT  
OFFSET  
BIAS  
Chip select/power-down feature allows  
Analog three-state operation  
Quiescent current reduction from 2.2 mA to 350 μA  
14-lead SBDIP, 14-lead low cost CERDIP, and 16-lead SOIC_W  
COMMON  
CS  
AD637  
Figure 1.  
GENERAL DESCRIPTION  
The AD637 is a complete, high accuracy, monolithic rms-to-dc  
converter that computes the true rms value of any complex  
waveform. It offers performance that is unprecedented in  
integrated circuit rms-to-dc converters and comparable to  
discrete and modular techniques in accuracy, bandwidth, and  
dynamic range. A crest factor compensation scheme in the  
AD637 permits measurements of signals with crest factors of  
up to 10 with less than 1% additional error. The wide band-  
width of the AD637 permits the measurement of signals up to  
600 kHz with inputs of 200 mV rms and up to 8 MHz when the  
input levels are above 1 V rms.  
The input circuitry of the AD637 is protected from overload  
voltages in excess of the supply levels. The inputs are not  
damaged by input signals if the supply voltages are lost.  
The AD637 is available in accuracy Grade J and Grade K for  
commercial temperature range (0°C to 70°C) applications, accuracy  
Grade A and Grade B for industrial range (−40°C to +85°C) appli-  
cations, and accuracy Grade S rated over the −55°C to +125°C  
temperature range. All versions are available in hermetically sealed,  
14-lead SBDIP, 14-lead CERDIP, and 16-lead SOIC_W packages.  
The AD637 computes the true root mean square, mean square,  
or absolute value of any complex ac (or ac plus dc) input  
waveform and gives an equivalent dc output voltage. The true  
rms value of a waveform is more useful than an average  
rectified signal because it relates directly to the power of the  
signal. The rms value of a statistical signal is also related to the  
standard deviation of the signal.  
As with previous monolithic rms converters from Analog  
Devices, Inc., the AD637 has an auxiliary dB output available to  
users. The logarithm of the rms output signal is brought out to a  
separate pin, allowing direct dB measurement with a useful  
range of 60 dB. An externally programmed reference current  
allows the user to select the 0 dB reference voltage to correspond to  
any level between 0.1 V and 2.0 V rms.  
The AD637 is laser wafer trimmed to achieve rated performance  
without external trimming. The only external component  
required is a capacitor that sets the averaging time period. The  
value of this capacitor also determines low frequency accuracy,  
ripple level, and settling time.  
A chip select connection on the AD637 permits the user to  
decrease the supply current from 2.2 mA to 350 μA during periods  
when the rms function is not in use. This feature facilitates the  
addition of precision rms measurement to remote or handheld  
applications where minimum power consumption is critical. In  
addition, when the AD637 is powered down, the output goes to a  
high impedance state. This allows several AD637s to be tied  
together to form a wideband true rms multiplexer.  
The on-chip buffer amplifier can be used either as an input  
buffer or in an active filter configuration. The filter can be used  
to reduce the amount of ac ripple, thereby increasing accuracy.  
Rev. K  
Information furnished by Analog Devices is believed to be accurate and reliable. However, no  
responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other  
rights of third parties that may result from its use. Specifications subject to change without notice. No  
license is granted by implication or otherwise under any patent or patent rights of Analog Devices.  
Trademarks and registeredtrademarks arethe property of their respective owners.  
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  
©2011 Analog Devices, Inc. All rights reserved.  
 

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