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AD594ADZ

更新时间: 2024-01-04 22:51:30
品牌 Logo 应用领域
亚德诺 - ADI 仪表放大器放大器电路PC
页数 文件大小 规格书
8页 131K
描述
Monolithic Thermocouple Amplifiers with Cold Junction Compensation

AD594ADZ 技术参数

Source Url Status Check Date:2013-05-01 14:56:15.076是否无铅: 含铅
是否Rohs认证: 不符合生命周期:Active
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:8542.31.00.01
风险等级:7.24放大器类型:INSTRUMENTATION AMPLIFIER
最大平均偏置电流 (IIB):0.1 µA标称带宽 (3dB):0.015 MHz
JESD-30 代码:R-GDIP-T14JESD-609代码:e0
长度:19.55 mm功能数量:1
端子数量:14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 APPLICABLE电源:5 V
认证状态:Not Qualified座面最大高度:5.283 mm
子类别:Instrumentation Amplifier最大压摆率:0.3 mA
供电电压上限:36 V标称供电电压 (Vsup):5 V
表面贴装:NO技术:BIPOLAR
温度等级:MILITARY端子面层:Tin/Lead (Sn63Pb37)
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 APPLICABLE
宽度:7.62 mmBase Number Matches:1

AD594ADZ 数据手册

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AD594/AD595  
ALARM CIRCUIT  
The alarm can be used with both single and dual supplies. It  
can be operated above or below ground. The collector and emit-  
ter of the output transistor can be used in any normal switch  
configuration. As an example a negative referenced load can be  
driven from –ALM as shown in Figure 12.  
In all applications of the AD594/AD595 the –ALM connection,  
Pin 13, should be constrained so that it is not more positive  
than (V+) – 4 V. This can be most easily achieved by connect-  
ing Pin 13 to either common at Pin 4 or V– at Pin 7. For most  
applications that use the alarm signal, Pin 13 will be grounded  
and the signal will be taken from +ALM on Pin 12. A typical  
application is shown in Figure 10.  
+10V  
CONSTANTAN  
(ALUMEL)  
10mV/؇C  
14  
13  
12  
11  
10  
9
8
In this configuration the alarm transistor will be off in normal  
operation and the 20 k pull up will cause the +ALM output on  
Pin 12 to go high. If one or both of the thermocouple leads are  
interrupted, the +ALM pin will be driven low. As shown in Fig-  
ure 10 this signal is compatible with the input of a TTL gate  
which can be used as a buffer and/or inverter.  
OVERLOAD  
DETECT  
AD594/  
AD595  
+A  
ICE  
POINT  
COMP.  
G
G
–TC  
+TC  
IRON  
1
2
3
4
5
6
7
(CHROMEL)  
+5V  
GND  
–12V  
20k⍀  
ALARM  
ALARM OUT  
TTL GATE  
CONSTANTAN  
(ALUMEL)  
ALARM  
RELAY  
10mV/؇C  
13  
12  
11  
10  
9
8
14  
OVERLOAD  
DETECT  
AD594/  
AD595  
Figure 12. –ALM Driving A Negative Referenced Load  
+A  
The collector (+ALM) should not be allowed to become more  
positive than (V–) +36 V, however, it may be permitted to be  
more positive than V+. The emitter voltage (–ALM) should be  
constrained so that it does not become more positive than 4  
volts below the V+ applied to the circuit.  
ICE  
POINT  
COMP.  
G
G
–TC  
+TC  
IRON  
(CHROMEL)  
1
2
3
4
5
6
7
GND  
Additionally, the AD594/AD595 can be configured to produce  
an extreme upscale or downscale output in applications where  
an extra signal line for an alarm is inappropriate. By tying either  
of the thermocouple inputs to common most runaway control  
conditions can be automatically avoided. A +IN to common  
connection creates a downscale output if the thermocouple opens,  
while connecting –IN to common provides an upscale output.  
Figure 10. Using the Alarm to Drive a TTL Gate  
(“Grounded’’ Emitter Configuration)  
Since the alarm is a high level output it may be used to directly  
drive an LED or other indicator as shown in Figure 11.  
V+  
LED  
CELSIUS THERMOMETER  
The AD594/AD595 may be configured as a stand-alone Celsius  
thermometer as shown in Figure 13.  
CONSTANTAN  
(ALUMEL)  
270  
10mV/؇C  
14  
13  
12  
11  
10  
9
8
OVERLOAD  
DETECT  
+5V TO +15V  
OUTPUT  
AD594/  
AD595  
+A  
13  
12  
11  
10  
9
8
14  
10mV/؇C  
OVERLOAD  
DETECT  
ICE  
POINT  
COMP.  
G
G
–TC  
+TC  
AD594/  
AD595  
+A  
IRON  
1
2
3
4
5
6
7
(CHROMEL)  
ICE  
POINT  
COMP.  
G
G
–TC  
COMMON  
+TC  
1
2
3
Figure 11. Alarm Directly Drives LED  
4
5
6
7
GND  
A 270 series resistor will limit current in the LED to 10 mA,  
but may be omitted since the alarm output transistor is current  
limited at about 20 mA. The transistor, however, will operate in  
a high dissipation mode and the temperature of the circuit will  
rise well above ambient. Note that the cold junction compensa-  
tion will be affected whenever the alarm circuit is activated. The  
time required for the chip to return to ambient temperature will  
depend on the power dissipation of the alarm circuit, the nature  
of the thermal path to the environment and the alarm duration.  
0 TO –15V  
Figure 13. AD594/AD595 as a Stand-Alone Celsius  
Thermometer  
Simply omit the thermocouple and connect the inputs (Pins 1  
and 14) to common. The output now will reflect the compensa-  
tion voltage and hence will indicate the AD594/AD595  
temperature with a scale factor of 10 mV/°C. In this three termi-  
nal, voltage output, temperature sensing mode, the AD594/  
AD595 will operate over the full military –55°C to +125°C tem-  
perature range.  
REV. C  
–7–  

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