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AD637BR PDF预览

AD637BR

更新时间： 2024-02-23 15:39:10
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
10页 163K
描述
High Precision, Wide-Band RMS-to-DC Converter

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AD637BR 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

AD637BR 数据手册

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AD637  
Table I. Practical Values of CAV and C2 for Various Input  
Waveforms  
AC MEASUREMENT ACCURACY AND CREST FACTOR  
Crest factor is often overlooked in determining the accuracy of  
an ac measurement. Crest factor is defined as the ratio of the  
peak signal amplitude to the rms value of the signal (C.F. = Vp/  
V rms). Most common waveforms, such as sine and triangle  
waves, have relatively low crest factors (≤2). Waveforms which  
resemble low duty cycle pulse trains, such as those occurring in  
switching power supplies and SCR circuits, have high crest  
factors. For example, a rectangular pulse train with a 1% duty  
Recommended C and C2  
AV  
Values for 1% Averaging  
Error@60Hz with T = 16.6ms  
Minimum  
Absolute Value  
Circuit Waveform  
and Period  
Input Waveform  
and Period  
R 
؋
 C  
1%  
Settling  
Time  
AV  
Recommended Recommended  
Time  
Constant  
Standard  
Value CAV  
Standard  
Value C2  
1/2T  
T
1/2T  
0.47␮F  
0.82␮F  
1.5␮F  
2.7␮F  
181ms  
325ms  
A
0V  
Symmetrical Sine Wave  
T
η
cycle has a crest factor of 10 (C.F. = 1  
).  
T
T
B
C
D
100␮s  
T
T
␩ = DUTY CYCLE =  
0V  
Sine Wave with dc Offset  
Vp  
e0  
␩
CF = 1/  
0
T
T
e
IN  
(rms) = 1 Volt rms  
100␮F  
10(T – T )  
2
T
2
T
6.8␮F  
5.6␮F  
22␮F  
18␮F  
2.67sec  
2.17sec  
2
0V  
10  
Pulse Train Waveform  
T
C
AV  
= 22␮F  
T
T
2
10(T – 2T )  
2
T
2
0V  
1.0  
0.1  
CF = 10  
FREQUENCY RESPONSE  
The frequency response of the AD637 at various signal levels is  
shown in Figure 10. The dashed lines show the upper frequency  
limits for 1%, 10% and ±3 dB of additional error. For example,  
note that for 1% additional error with a 2 V rms input the high-  
est frequency allowable is 200 kHz. A 200 mV signal can be  
measured with 1% error at signal frequencies up to 100 kHz.  
CF = 3  
0.01  
1
10  
100  
1000  
PULSEWIDTH – ␮s  
10  
Figure 11. AD637 Error vs. Pulsewidth Rectangular Pulse  
7V RMS INPUT  
2V RMS INPUT  
Figure 12 is a curve of additional reading error for the AD637  
for a 1 volt rms input signal with crest factors from 1 to 11. A  
rectangular pulse train (pulsewidth 100 µs) was used for this test  
since it is the worst-case waveform for rms measurement (all  
1V RMS INPUT  
1
1%  
10%  
؎3dB  
100mV RMS INPUT  
0.1  
+1.5  
+1.0  
+0.5  
0
0.01  
10mV RMS INPUT  
1k  
10k  
100k  
1M  
10M  
INPUT FREQUENCY – Hz  
Figure 10. Frequency Response  
To take full advantage of the wide bandwidth of the AD637 care  
must be taken in the selection of the input buffer amplifier. To  
insure that the input signal is accurately presented to the con-  
verter, the input buffer must have a –3 dB bandwidth that is  
wider than that of the AD637. A point that should not be over-  
looked is the importance of slew rate in this application. For  
example, the minimum slew rate required for a 1 V rms 5 MHz  
sine-wave input signal is 44 V/µs. The user is cautioned that this  
is the minimum rising or falling slew rate and that care must be  
exercised in the selection of the buffer amplifier as some amplifi-  
ers exhibit a two-to-one difference between rising and falling slew  
rates. The AD845 is recommended as a precision input buffer.  
+0.5  
POSITIVE INPUT PULSE  
C
= 22␮F  
AV  
–1.0  
–1.5  
1
2
3
4
5
6
7
8
9
10  
11  
CREST FACTOR  
Figure 12. Additional Error vs. Crest Factor  
REV. E  
–7–  
1...45678910

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