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AD592

更新时间： 2024-01-31 20:47:47
品牌 Logo 应用领域
亚德诺 - ADI 传感器温度传感器
页数 文件大小 规格书
8页 305K
描述
Low Cost, Precision IC Temperature Transducer

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AD592 技术参数

是否无铅： 含铅是否Rohs认证： 符合
生命周期：Active包装说明：SIP3,.1,50
针数：3Reach Compliance Code：compliant
ECCN代码：EAR99HTS代码：8542.39.00.01
风险等级：0.87最大精度（摄氏度）：0.15 Cel
主体宽度：4.06 mm主体高度：4.85 mm
主体长度或直径：5.08 mm外壳：PLASTIC
JESD-609代码：e3线性度（Cel）：0.15 Cel
安装特点：THROUGH HOLE MOUNT端子数量：3
最高工作温度：105 °C最低工作温度：-25 °C
输出电流标称：298.2 µA封装主体材料：PLASTIC/EPOXY
封装等效代码：SIP3,.1,50封装形状/形式：ROUND
电源：5 V传感器/换能器类型：TEMPERATURE SENSOR,ANALOG,RESISTANCE BASED
子类别：Other Sensors最大供电电压：30 V
最小供电电压：4 V表面贴装：NO
端子面层：Matte Tin (Sn)端接类型：SOLDER
Base Number Matches：1

AD592 数据手册

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AD592  
+V  
SUPPLY VOLTAGE AND THERMAL ENVIRONMENT  
EFFECTS  
AD592  
The power supply rejection characteristics of the AD592 mini-  
mizes errors due to voltage irregularity, ripple and noise. If a  
supply is used other than 5 V (used in factory trimming), the  
power supply error can be removed with a single temperature  
trim. The PTAT nature of the AD592 will remain unchanged.  
The general insensitivity of the output allows the use of lower  
cost unregulated supplies and means that a series resistance of  
several hundred ohms (e.g., CMOS multiplexer, meter coil  
resistance) will not degrade the overall performance.  
R
100Ω  
V
= 1mV/K  
OUT  
950Ω  
Figure 4. Basic Voltage Output (Single Temperature Trim)  
To trim the circuit the temperature must be measured by a ref-  
erence sensor and the value of R should be adjusted so the out-  
put (VOUT) corresponds to 1 mV/K. Note that the trim  
procedure should be implemented as close as possible to the  
temperature highest accuracy is desired for. In most applications  
if a single temperature trim is desired it can be implemented  
where the AD592 current-to-output voltage conversion takes  
place (e.g., output resistor, offset to an op amp). Figure 5 illus-  
trates the effect on total error when using this technique.  
+2.0  
+1.0  
0
–1.0  
–2.0  
+1.0  
ACCURACY  
WITHOUT TRIM  
+0.5  
0
–25  
0
+25  
+75  
+105  
o
TEMPERATURE –  
C
AFTER SINGLE  
TEMPERATURE  
CALIBRATION  
Figure 7. Typical Two Trim Accuracy  
–0.5  
The thermal environment in which the AD592 is used deter-  
mines two performance traits: the effect of self-heating on accu-  
racy and the response time of the sensor to rapid changes in  
temperature. In the first case, a rise in the IC junction tempera-  
ture above the ambient temperature is a function of two vari-  
ables; the power consumption level of the circuit and the  
thermal resistance between the chip and the ambient environ-  
ment (θJA). Self-heating error in °C can be derived by multiply-  
ing the power dissipation by θJA. Because errors of this type can  
vary widely for surroundings with different heat sinking capaci-  
ties it is necessary to specify θJA under several conditions. Table  
I shows how the magnitude of self-heating error varies relative  
to the environment. In typical free air applications at +25°C  
with a 5 V supply the magnitude of the error is 0.2°C or less. A  
common clip-on heat sink will reduce the error by 25% or more  
in critical high temperature, large supply voltage situations.  
–1.0  
–25  
+25  
+105  
o
TEMPERATURE –  
C
Figure 5. Effect of Scale Factor Trim on Accuracy  
If greater accuracy is desired, initial calibration and scale factor  
errors can be removed by using the AD592 in the circuit of  
Figure 6.  
R2  
5kΩ  
97.6kΩ  
+5V  
R1  
1kΩ  
8.66kΩ  
AD741  
AD1403  
Table I. Thermal Characteristics  
o
V
= 100mV/ C  
OUT  
7.87kΩ  
Medium  
θJA (°C/watt)  
τ (sec)*  
AD592  
Still Air  
Without Heat Sink  
With Heat Sink  
Moving Air  
175  
130  
60  
55  
V–  
Figure 6. Two Temperature Trim Circuit  
Without Heat Sink  
With Heat Sink  
Fluorinert Liquid  
Aluminum Block**  
60  
40  
35  
30  
12  
10  
5
With the transducer at 0°C adjustment of R1 for a 0 V output  
nulls the initial calibration error and shifts the output from K to  
°C. Tweaking the gain of the circuit at an elevated temperature  
by adjusting R2 trims out scale factor error. The only error  
remaining over the temperature range being trimmed for is  
nonlinearity. A typical plot of two trim accuracy is given in  
Figure 7.  
2.4  
NOTES  
*τ is an average of five time constants (99.3% of final value). In cases where the  
thermal response is not a simple exponential function, the actual thermal re-  
sponse may be better than indicated.  
**With thermal grease.  
REV. A  
–5–  
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