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ADT70*

更新时间： 2024-01-18 13:19:37
品牌 Logo 应用领域
其他 - ETC 控制器
页数 文件大小 规格书
14页 154K
描述
PRTD Conditioning Circuit and Temperature Controller

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ADT70* 技术参数

是否无铅： 含铅是否Rohs认证： 不符合
生命周期：Obsolete包装说明：SOIC-20
Reach Compliance Code：not_compliantECCN代码：EAR99
HTS代码：8542.33.00.01风险等级：5.91
其他特性：RAIL-TO-RAIL OUTPUT, TEMPERATURE COEFFICIENT +/- 15 PPM/DEG C主体宽度：7.5 mm
主体高度：2.5 mm主体长度或直径：12.8 mm
外壳：PLASTICJESD-609代码：e0
安装特点：THROUGH HOLE MOUNT最大工作电流：3 mA
最高工作温度：125 °C最低工作温度：-40 °C
最大输出电压：2.5 V封装形状/形式：RECTANGULAR
传感器/换能器类型：TEMPERATURE SENSOR,ANALOG,VOLTAGE OUTPUT最大供电电压：5.5 V
最小供电电压：4.5 V表面贴装：NO
端子面层：Tin/Lead (Sn85Pb15)端接类型：SOLDER
Base Number Matches：1

ADT70* 数据手册

 浏览型号ADT70*的Datasheet PDF文件第8页浏览型号ADT70*的Datasheet PDF文件第9页浏览型号ADT70*的Datasheet PDF文件第10页浏览型号ADT70*的Datasheet PDF文件第11页浏览型号ADT70*的Datasheet PDF文件第12页浏览型号ADT70*的Datasheet PDF文件第14页 
ADT70  
American PRTD Application Circuit  
Strain Gauge Sensor Application Circuit  
The majority of PRTD sensors use a scale factor of 0.00385 Ω/Ω/°C.  
This type of sensor is known as the European PRTD and is the most  
common PRTD sensor. However, there is also an American PRTD  
sensor that uses a scale factor of 0.00392 Ω/Ω/°C. Figure 33 illus-  
trates the input section of the ADT70 configured for the Ameri-  
can PRTD. The ideal value for RG is 50.98 kΩ when yielding a  
5 mV/°C ADT70 output.  
Figure 34 illustrates a typical strain gauge bridge circuit. The  
versatility of the ADT70 allows the part to be used with most  
bridge circuits that are within the 50 kΩ to 5 kΩ impedance  
range. The sensor used in this circuit has two elements varying.  
If a constant current is driven into the sensor, a linear VOUT is  
obtained. In addition, the ADT70 will work with most bridge  
circuits whether one-, two-, or all-element varying.  
Securing Additional Current from the Current Sources  
Some sensor applications need a higher excitation current to in-  
crease sensor sensitivity. There are two methods to increase the  
current from the on-board current sources of the ADT70. The  
most flexible method involves changing the voltage at the BIAS  
node. The equation for determining the BIAS potential vs. Out-  
put current is 2.5 V for roughly 1 mA, or in other words, to  
double the current output simply put 5 V into BIAS. The BIAS  
node should be driven with a low-noise source, such as a refer-  
ence, because output current is directly dependent on BIAS volt-  
age. Directly tying BIAS to the positive supply rail may produce  
too much current noise especially if the positive rail is not well  
regulated. The second method involves tying the two ADT70  
current outputs together which doubles the current. Of course,  
this technique is most useful if, as illustrated in Figure 34, the ap-  
plication requires only one current source.  
I
OUTA  
I
OUTB  
؊IN  
IA  
RG  
INST  
AMP  
49.9k⍀  
RG  
+IN  
2k⍀  
IA  
1k⍀  
REF  
RESISTOR  
1k⍀  
PRTD  
GND  
SENSE  
OUT  
NOTE: IDEAL VALUE  
FOR RG =51k⍀  
˜
Figure 33. Typical PRTD Application with American  
0.003916 Ω/Ω /°C Scale; 1 kΩ Scale  
NULLA  
NULLB  
BIAS  
2.5V  
REFOUT  
+5V  
ADT70  
+V  
S
OUT  
OA  
I
OUTA  
MATCHED  
CURRENT  
SOURCES  
I
OUTB  
+IN  
OA  
R
R
R
R
2.5V  
REF  
؊IN  
OA  
؊IN  
IA  
RG  
INST  
AMP  
SHUT-  
DOWN  
SHUTDOWN  
RG  
+IN  
IA  
COLUMBIA RESEARCH LAB  
MODEL DT3617  
STRAIN SENSOR  
R = 1k⍀  
DGND  
؊5V  
Figure 34. Typical Strain Sensor Application (Two Element Varying)  
REV. 0  
–13–  
1...1011121314

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