- 您现在的位置：买卖IC网 > Datasheet目录38 > AD595CD (Analog Devices Inc)IC THERMOCOUPLE INSTR AMP 14CDIP Datasheet资料下载
参数资料
| 型号： | AD595CD |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/8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
6
of R3 should be approximately 280 k&. The final connection
diagram is shown in Figure 7. An approximate verification of
the effectiveness of recalibration is to measure the differential
gain to the output. For type E it should be 164.2.
AD594/
AD595
T
+IN
IN
+T
COM
1
14
4
2
3
C
5
6
FB
VO
8
9
R3
+C
R1
R2
Figure 7. Type E Recalibration
When implementing a similar recalibration procedure for the
AD595 the values for R1, R2, R3 and r will be approximately
650 &, 84 k&, 93 k& and 1.51, respectively. Power consump-
tion will increase by about 50% when using the AD595 with
type E inputs.
Note that during this procedure it is crucial to maintain the
AD594/AD595 at a stable temperature because it is used as the
temperature reference. Contact with fingers or any tools not at
ambient temperature will quickly produce errors. Radiational
heating from a change in lighting or approach of a soldering iron
must also be guarded against.
USING TYPE T THERMOCOUPLES WITH THE AD595
Because of the similarity of thermal EMFs in the 0癈 to +50癈
range between type K and type T thermocouples, the AD595
can be directly used with both types of inputs. Within this ambi-
ent temperature range the AD595 should exhibit no more than
an additional 0.2癈 output calibration error when used with
type T inputs. The error arises because the ice point compensa-
tor is trimmed to type K characteristics at 25癈. To calculate
the AD595 output values over the recommended 200癈 to
+350癈 range for type T thermocouples, simply use the ANSI
thermocouple voltages referred to 0癈 and the output equation
given on page 2 for the AD595. Because of the relatively large
nonlinearities associated with type T thermocouples the output
will deviate widely from the nominal 10 mV/癈. However, cold
junction compensation over the rated 0癈 to +50癈 ambient
will remain accurate.
STABILITY OVER TEMPERATURE
Each AD594/AD595 is tested for error over temperature with
the measuring thermocouple at 0癈. The combined effects of
cold junction compensation error, amplifier offset drift and gain
error determine the stability of the AD594/AD595 output over
the rated ambient temperature range. Figure 8 shows an AD594/
AD595 drift error envelope. The slope of this figure has units
of 癈/癈.
TEMPERATURE OF AD594C/AD595C
0.6C
50C
25C
0
+0.6C
Figure 8. Drift Error vs. Temperature
THERMAL ENVIRONMENT EFFECTS
The inherent low power dissipation of the AD594/AD595 and
the low thermal resistance of the package make self-heating
errors almost negligible. For example, in still air the chip to am-
bient thermal resistance is about 80癈/watt (for the D package).
At the nominal dissipation of 800 礧 the self-heating in free air
is less than 0.065癈. Submerged in fluorinert liquid (unstirred)
the thermal resistance is about 40癈/watt, resulting in a self-
heating error of about 0.032癈.
SETPOINT CONTROLLER
The AD594/AD595 can readily be connected as a setpoint
controller as shown in Figure 9.
CONSTANTAN
(ALUMEL)
IRON
(CHROMEL)
+5V
COMMON
HEATER
20M
(OPTIONAL)
FOR
HYSTERESIS
SETPOINT
VOLTAGE
INPUT
TEMPERATURE
CONTROLLED
REGION
LOW = > T < SETPOINT
HIGH = > T > SETPOINT
TEMPERATURE
COMPARATOR OUT
HEATER
DRIVER
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 9. Setpoint Controller
The thermocouple is used to sense the unknown temperature
and provide a thermal EMF to the input of the AD594/AD595.
The signal is cold junction compensated, amplified to 10 mV/癈
and compared to an external setpoint voltage applied by the
user to the feedback at Pin 8. Table I lists the correspondence
between setpoint voltage and temperature, accounting for the
nonlinearity of the measurement thermocouple. If the setpoint
temperature range is within the operating range (55癈 to
+125癈) of the AD594/AD595, the chip can be used as the
transducer for the circuit by shorting the inputs together and
utilizing the nominal calibration of 10 mV/癈. This is the centi-
grade thermometer configuration as shown in Figure 13.
In operation if the setpoint voltage is above the voltage corre-
sponding to the temperature being measured the output swings
low to approximately zero volts. Conversely, when the tempera-
ture rises above the setpoint voltage the output switches to
the positive limit of about 4 volts with a +5 V supply. Figure
9 shows the setpoint comparator configuration complete with a
heater element driver circuit being controlled by the AD594/
AD595 toggled output. Hysteresis can be introduced by inject-
ing a current into the positive input of the feedback amplifier
when the output is toggled high. With an AD594 about 200 nA
into the +T terminal provides 1癈 of hysteresis. When using a
single 5 V supply with an AD594, a 20 M& resistor from V
O
to
+T will supply the 200 nA of current when the output is forced
high (about 4 V). To widen the hysteresis band decrease the
resistance connected from VO to +T.
相关PDF资料 |
PDF描述 |
|---|---|
| AD597AHZ | IC THERMOCOUPLE COND TO-100-10 |
| AD7314ARMZ-REEL7 | IC SENSOR TEMP 10BIT DGTL 8-MSOP |
| AD7814ARTZ-REEL | IC TEMP SNSR 10BIT DGTL SOT23-6 |
| AD7818ARZ | IC ADC 10BIT W/TEMP SENSOR 8SOIC |
| AD8210WYRZ-R7 | IC CURRENT MONITOR 0.5% 8SOIC |
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 |
发布紧急采购，3分钟左右您将得到回复。