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AD637ARZ

更新时间： 2024-02-22 05:41:14
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PC
页数 文件大小 规格书
20页 613K
描述
High Precision, Wideband RMS-to-DC Converter

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AD637ARZ 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

AD637ARZ 数据手册

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AD637  
20  
15  
10  
5
STANDARD CONNECTION  
The AD637 is simple to connect for a majority of rms  
measurements. In the standard rms connection shown in Figure 5,  
only a single external capacitor is required to set the averaging  
time constant. In this configuration, the AD637 computes the  
true rms of any input signal. An averaging error, the magnitude  
of which is dependent on the value of the averaging capacitor,  
is present at low frequencies. For example, if the filter capacitor,  
C
AV, is 4 μF, the error is 0.1% at 10 Hz and increases to 1% at  
3 Hz. To measure ac signals, the AD637 can be ac-coupled by  
adding a nonpolar capacitor in series with the input, as shown  
in Figure 5.  
0
0
±3  
±5  
±10  
±15  
±18  
SUPPLY VOLTAGE – DUAL SUPPLY (V)  
AD637  
1
BUFF IN  
BUFF  
OUT 14  
NC  
Figure 6. Maximum VOUT vs. Supply Voltage  
2
3
NC  
V
IN  
V
CHIP SELECT  
IN  
13  
ABSOLUTE  
VALUE  
The AD637 includes a chip select feature that allows the user  
to decrease the quiescent current of the device from 2.2 mA to  
350 μA. This is done by driving CS, Pin 5, to below 0.2 V dc.  
Under these conditions, the output goes into a high impedance  
state. In addition to reducing the power consumption,  
the outputs of multiple devices can be connected in parallel  
to form a wide bandwidth rms multiplexer. Tie Pin 5 high to  
disable the chip select.  
COMMON  
NC 12  
11  
+V  
S
(OPTIONAL)  
SQUARER/  
DIVIDER  
OUTPUT  
OFFSET  
4
5
6
7
+V  
BIAS  
+V  
S
S
4.7kΩ  
CS  
10  
9
–V  
C
–V  
S
S
25kΩ  
DEN  
INPUT  
2
= V  
IN  
V
OUT  
25kΩ  
C
+
8
AV  
dB OUTPUT  
AV  
OPTIONAL TRIMS FOR HIGH ACCURACY  
The AD637 includes provisions for trimming out output offset  
and scale factor errors resulting in significant reduction in the  
maximum total error, as shown in Figure 7. The residual error is  
due to a nontrimmable input offset in the absolute value circuit  
and the irreducible nonlinearity of the device.  
Figure 5. Standard RMS Connection  
The performance of the AD637 is tolerant of minor variations  
in the power supply voltages; however, if the supplies used  
exhibit a considerable amount of high frequency ripple, it is  
advisable to bypass both supplies to ground through a 0.1 μF  
Referring to Figure 8, the trimming process is as follows:  
ceramic disc capacitor placed as close to the device as possible.  
• Offset trim: Ground the input signal (VIN) and adjust R1 to  
give 0 V output from Pin 9. Alternatively, R1 can be adjusted  
to give the correct output with the lowest expected value of VIN.  
The output signal range of the AD637 is a function of the  
supply voltages, as shown in Figure 6. The output signal can be  
used buffered or nonbuffered, depending on the characteristics  
of the load. If no buffer is needed, tie the buffer input (Pin 1) to  
common. The output of the AD637 is capable of driving 5 mA  
into a 2 kΩ load without degrading the accuracy of the device.  
• Scale factor trim: Resistor R4 is inserted in series with the  
input to lower the range of the scale factor. Connect the  
desired full-scale input to VIN, using either a dc or a calibrated ac  
signal, and trim Resistor R3 to give the correct output at Pin 9  
(that is, 1 V dc at the input results in a dc output voltage of  
l.000 V dc). A 2 V p-p sine wave input yields 0.707 V dc at the  
output. Remaining errors are due to the nonlinearity.  
Rev. K | Page 8 of 20  
 
 
 
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