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ADT70*

更新时间： 2024-02-24 11:44:06
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12页浏览型号ADT70*的Datasheet PDF文件第13页浏览型号ADT70*的Datasheet PDF文件第14页 
ADT70  
achieve in a single supply application where the negative rail is  
ground or 0 V. Therefore, to achieve full scale operation the  
output of ADT70 should be shifted by 1 V to allow for opera-  
tion in the 0 V to 5 V region.  
However, a voltage applied to GND SENSE is not the only  
method to shift the voltage range. Placing a 768 Ω resistor in the  
PRTD sensor path also shifts the output voltage by 1 V. This  
second method, as shown in Figure 30, is usually not recom-  
mended for the following reasons; the input voltage range of the  
op amps is limited to around 1 V from the negative and positive  
rails and this could cause problems at high temperature, limiting  
the upper range to 600°C; the physical location of this resistor  
(if placed at a distance from the ADT70) may have an impact  
on the noise performance. The method frees up the on-board op  
amp for another function and achieves the lowest impedance  
ground point for GND SENSE.  
The most straightforward method to shift the output voltage  
incorporates the use of the GND SENSE as shown in Figure 29.  
To shift output voltage range apply a potential equal to the neces-  
sary shift on the GND SENSE pin. For example, to shift the out-  
put voltage, OUTIA, up to 1 V to GND SENSE, apply 1 V to  
GND SENSE. When applying a potential to GND SENSE, care  
should be taken to ensure that the voltage source is capable of driv-  
ing 2 kΩ and does not introduce excessive noise. Figure 29 uses the  
on-board 2.5 V voltage reference for a low noise source. This refer-  
ence is then divided to 1 V and buffered by the on-board op amp  
to drive GND SENSE at a low impedance. A small 500 Ω potenti-  
ometer can be used to calibrate the initial offset error to zero.  
This brief section on ADT70 single supply operation has focused  
on simple techniques to bias the ADT70 such that all output volt-  
ages are within operational range. However, these techniques may  
not be useful in all single supply applications. For example, in Fig-  
ure 3 the additional on-board op amp is operating at near ground  
potential which will create problems in a single supply application  
NULLA  
NULLB  
BIAS  
2.5V  
REFOUT  
ADT70  
+V  
S
OUT  
OA  
I
15k⍀  
OUTA  
MATCHED  
CURRENT  
SOURCES  
+IN  
OA  
I
OUTB  
9.76k⍀  
؊IN  
2.5V  
REF  
OA  
500⍀  
POT  
؊IN  
IA  
RG  
1k⍀  
REF  
RESISTOR  
INST  
AMP  
SHUT-  
DOWN  
TO CONTROLLER  
SHUTDOWN  
49.9k⍀  
RG  
+IN  
IA  
1k⍀  
PRTD  
SENSOR  
GND  
SENSE  
OUT  
DGND  
IA  
Figure 29. A Single Supply Application with Shifted Ground Sense Pin  
+5V  
ADT70  
NULLA  
NULLB  
BIAS  
2.5V  
REFOUT  
+V  
S
V
REF  
OUT  
I
OA  
OUTA  
MATCHED  
CURRENT  
SOURCES  
I
OUTB  
+IN  
OA  
2.5V  
REF  
؊IN  
OA  
؊IN  
IA  
RG  
INST  
AMP  
SHUT-  
DOWN  
768⍀  
RESISTOR  
TO CONTROLLER  
SHUTDOWN  
49.9k⍀  
RG  
+IN  
IA  
1K⍀  
REF  
RESISTOR  
1K⍀  
PRTD  
GND  
SENSE  
؊V  
DGND  
S
TO A/D CONVERTER  
Figure 30. A Basic Single Supply Operational Diagram with Bias Resistor in Sensor Path  
REV. 0  
–11–  
1...891011121314

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