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ADT70*

更新时间： 2024-01-02 02:50:05
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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

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ADT70  
A basic physical property of any metal is that its electrical resis-  
tivity changes with temperature. Some metals are known to have  
a very predictable and repeatable change of resistance for a  
given change in temperature. An RTD is fabricated from one of  
these metals to a nominal ohmic value at a specified tempera-  
ture. By measuring its resistance at some unknown temperature  
and comparing this value to the resistor’s nominal value, the  
change in resistance is determined. Because the temperature vs.  
resistance characteristics are also known, the change in tempera-  
ture from the point initially specified can be calculated. This  
makes the RTD a practical temperature sensor, which in its bare  
form is a resistive element.  
50  
V
V
OF IN AMP = 300mV  
= 5V SINGLE SUPPLY  
OUT  
CC  
40  
30  
20  
10  
0
TURNING ON  
= LOW TO HIGH  
V
SHUTDOWN  
TURNING OFF  
= HIGH TO LOW  
V
SHUTDOWN  
Several types of metal can be chosen for fabricating RTDs.  
These include: Copper, balco (an iron-nickel alloy), nickel,  
tungsten, iridium and platinum. Platinum is by far the most  
popular material used, due to its nearly linear response to tem-  
perature, wide temperature operating range and superior long-  
term stability. The price of Platinum Resistance Temperature  
Detectors (PRTDs) are becoming more competitive through the  
wide use of thin-film-type resistive elements.  
0
25  
50  
75  
100  
125  
؊50  
؊25  
TEMPERATURE – ؇C  
Figure 25. System Response Time from Shutdown vs.  
Temperature  
FUNCTIONAL DESCRIPTION  
The ADT70 provides excitation and signal conditioning for  
resistance-temperature devices (RTDs). It is ideally suited for  
1 kΩ Platinum RTDs (PRTDs), which allow a much wider  
range of temperature measurement than silicon-based sensors.  
Using a low cost PRTD, the ADT70 can measure temperatures  
in the range of –50°C to +500°C.  
Temperature Coefficient of Resistance  
The temperature coefficient (TC, also referred to as α ) of an  
RTD, describes the average resistance change per unit tempera-  
ture from the ice point to the boiling point of water.  
R
100 − R0  
The two main components in the ADT70 are the adjustable  
current sources and the instrumentation amplifier. The current  
sources provide matching excitation currents to the PRTD and  
to the Reference Resistor. The instrumentation amplifier com-  
pares the voltage drop across both the PRTD and Reference  
Resistor, and provides an amplified output signal voltage that is  
proportional to temperature.  
TCR Ω Ω °C =  
(
)
100°C × R0  
R0 = Resistance of the sensor at 0°C  
100 = Resistance of the sensor at +100°C  
TCR = Thermal Coefficient of Resistance.  
R
For example, a platinum thermometer measuring 100 Ω at 0°C  
and 138.5 Ω at 100°C, has TCR 0.00385 Ω/Ω/°C .  
Besides the matching current sources and the instrumentation  
amplifier, there is a general purpose op amp for any application  
desired. The ADT70 comes with a +2.5 V reference on board.  
138.5Ω −100 Ω  
TCR =  
= 0.00385  
100 Ω ×100°C  
NULLA  
NULLB  
BIAS 2.5V  
REFOUT  
The larger the TCR, the greater the change in resistance for a  
given change in temperature. The most common use of TCR is  
to distinguish between curves for platinum, which is available  
with TCRs ranging from 0.00375 to 0.003927. The highest  
TCR indicates the highest purity platinum and is mandated by  
ITS-90 for standard platinum thermometers.  
ADT70  
+V  
S
OUT  
OA  
MATCHED  
CURRENT  
SOURCES  
I
I
OUTA  
OUTB  
+IN  
OA  
2.5V  
REF  
؊IN  
OA  
Basically, TCRs must be properly matched when replacing RTDs  
or connecting them to instruments. There are no technical advan-  
tages of one TCR over another in practical industrial applica-  
tions. 0.00385 platinum is the most popular worldwide standard  
and is available in both wire-wound and thin-film elements.  
+IN  
IA  
INST  
AMP  
SHUT-  
DOWN  
SHUTDOWN  
؊IN  
IA  
Understanding Error Source  
The ADT70 uses an instrumentation amplifier that amplifies the  
difference in voltage drop across the RTD and the reference resis-  
tor, to output a voltage proportional to the measured temperature.  
Thus, it is important to use a reference resistor that has stable resis-  
tance over temperature. The accuracy of the reference resistor  
should be determined by the end application.  
RGA RGB GND  
OUT  
IA  
AGND ؊V  
DGND  
S
SENSE  
Figure 26. Block Diagram  
What is an RTD?  
The measurable temperature range of the ADT70 heavily de-  
pends on the characteristics of the resistance-temperature detec-  
tor (RTD). Thus, it is important to choose the right RTD to  
suit the actual application.  
The lead resistance of wires connecting to the RTD and the refer-  
ence resistor can add inaccuracy to the ADT70. If the reference  
resistor is located close to the part, while the RTD is located at a  
remote location connected by wires, the lead-wires’ resistance  
–8–  
REV. 0  
1...567891011...14

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