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参数资料
| 型号： | AD595CD |
| 厂商： | Analog Devices Inc |
| 文件页数： | 4/8页 |
| 文件大小： | 136K |
| 描述： | IC THERMOCOUPLE INSTR AMP 14CDIP |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1 |
| 功能： | 热电偶放大器 |
| 传感器类型： | 外部 |
| 精确度： | ±1°C（最小值） |
| 拓扑： | 冰点补偿，过载检测 |
| 输出类型： | 电压 |
| 输出警报： | 是 |
| 输出风扇： | 无 |
| 电源电压： | 5 V ~ ±15 V |
| 工作温度： | -55°C ~ 125°C |
| 安装类型： | 通孔 |
| 封装/外壳： | 14-CDIP（0.300"，7.62mm） |
| 供应商设备封装： | 14-CDIP |
| 包装： | 管件 |
AD594/AD595
REV. C
4
CONSTANTAN
(ALUMEL)
IRON
(CHROMEL)
+5V TO +30V
COMMON
SPAN OF
5V TO 30V
0V TO 25V
OVERLOAD
DETECT
G
TC
+TC
1 2
3
4
5
6
7
13
12
11
10
AD594/
AD595
14
ICE
POINT
COMP.
+A
9
8
G
Figure 2. Dual Supply Operation
With a negative supply the output can indicate negative tem-
peratures and drive grounded loads or loads returned to positive
voltages. Increasing the positive supply from 5 V to 15 V ex-
tends the output voltage range well beyond the 750癈
temperature limit recommended for type J thermocouples
(AD594) and the 1250癈 for type K thermocouples (AD595).
Common-mode voltages on the thermocouple inputs must remain
within the common-mode range of the AD594/AD595, with a
return path provided for the bias currents. If the thermocouple
is not remotely grounded, then the dotted line connections in
Figures 1 and 2 are recommended. A resistor may be needed in
this connection to assure that common-mode voltages induced
in the thermocouple loop are not converted to normal mode.
THERMOCOUPLE CONNECTIONS
The isothermal terminating connections of a pair of thermo-
couple wires forms an effective reference junction. This junction
must be kept at the same temperature as the AD594/AD595 for
the internal cold junction compensation to be effective.
A method that provides for thermal equilibrium is the printed
circuit board connection layout illustrated in Figure 3.
IRON
(CHROMEL)
CONSTANTAN
(ALUMEL)
+T
+C
T
C
+IN
IN
1
14
ALM
+ALM
7
8
COMP
COMMON
V
V
OUT
V+
Figure 3. PCB Connections
Here the AD594/AD595 package temperature and circuit board
are thermally contacted in the copper printed circuit board
tracks under Pins 1 and 14. The reference junction is now com-
posed of a copper-constantan (or copper-alumel) connection
and copper-iron (or copper-chromel) connection, both of which
are at the same temperature as the AD594/AD595.
The printed circuit board layout shown also provides for place-
ment of optional alarm load resistors, recalibration resistors and
a compensation capacitor to limit bandwidth.
To ensure secure bonding the thermocouple wire should be
cleaned to remove oxidation prior to soldering. Noncorrosive
rosin flux is effective with iron, constantan, chromel and alumel
and the following solders: 95% tin-5% antimony, 95% tin-5%
silver or 90% tin-10% lead.
FUNCTIONAL DESCRIPTION
The AD594 behaves like two differential amplifiers. The out-
puts are summed and used to control a high gain amplifier, as
shown in Figure 4.
14
13
12
11
10
9
8
OVERLOAD
DETECT
ICE
POINT
COMP.
+A
G
G
TC
+TC
1
2
3
4
5
6
7
AD594/AD595
+IN
+C
+T
COM
T
C
V
IN
ALM +ALM
V+
COMP
VO
FB
Figure 4. AD594/AD595 Block Diagram
In normal operation the main amplifier output, at Pin 9, is con-
nected to the feedback network, at Pin 8. Thermocouple signals
applied to the floating input stage, at Pins 1 and 14, are ampli-
fied by gain G of the differential amplifier and are then further
amplified by gain A in the main amplifier. The output of the
main amplifier is fed back to a second differential stage in an in-
verting connection. The feedback signal is amplified by this
stage and is also applied to the main amplifier input through a
summing circuit. Because of the inversion, the amplifier causes
the feedback to be driven to reduce this difference signal to a
small value. The two differential amplifiers are made to match
and have identical gains, G. As a result, the feedback signal that
must be applied to the right-hand differential amplifier will pre-
cisely match the thermocouple input signal when the difference
signal has been reduced to zero. The feedback network is trim-
med so that the effective gain to the output, at Pins 8 and 9, re-
sults in a voltage of 10 mV/癈 of thermocouple excitation.
In addition to the feedback signal, a cold junction compensation
voltage is applied to the right-hand differential amplifier. The
compensation is a differential voltage proportional to the Celsius
temperature of the AD594/AD595. This signal disturbs the dif-
ferential input so that the amplifier output must adjust to restore
the input to equal the applied thermocouple voltage.
The compensation is applied through the gain scaling resistors
so that its effect on the main output is also 10 mV/癈. As a
result, the compensation voltage adds to the effect of the ther-
mocouple voltage a signal directly proportional to the difference
between 0癈 and the AD594/AD595 temperature. If the thermo-
couple reference junction is maintained at the AD594/AD595
temperature, the output of the AD594/AD595 will correspond
to the reading that would have been obtained from amplification
of a signal from a thermocouple referenced to an ice bath.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD595CDZ | 功能描述:IC THERMOCOUPLE INSTR AMP 14CDIP RoHS:是 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:3,000 系列:- 功能:温度开关 传感器类型:内部 感应温度:85°C 分界点 精确度:±6°C（最小值） 拓扑:ADC（三角积分型），比较器，寄存器库 输出类型:开路漏极 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:ADT6501SRJZP085RL7-ND |
| AD595CDZ | 制造商:Analog Devices 功能描述:IC INSTRUMENTATION AMPLIFIER TO116-14 |
| AD595CQ | 功能描述:IC THERMOCOUPLE A W/COMP 14CDIP RoHS:否 类别:集成电路 (IC) >> PMIC - 热管理 系列:- 标准包装:3,000 系列:- 功能:温度开关 传感器类型:内部 感应温度:85°C 分界点 精确度:±6°C（最小值） 拓扑:ADC（三角积分型），比较器，寄存器库 输出类型:开路漏极 输出警报:是 输出风扇:是 电源电压:2.7 V ~ 5.5 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:SC-74A，SOT-753 供应商设备封装:SOT-23-5 包装:带卷 (TR) 其它名称:ADT6501SRJZP085RL7-ND |
| AD596 | 制造商:AD 制造商全称:Analog Devices 功能描述:Thermocouple Conditioner and Setpoint Controller |
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