参数资料
| 型号： | AD8494CRMZ |
| 厂商： | Analog Devices Inc |
| 文件页数： | 6/16页 |
| 文件大小： | 0K |
| 描述： | THERMOCOUPLE AMPLIFIER I |
| 标准包装： | 50 |
| 类型： | 热电偶放大器 |
| 输入类型： | 差分 |
| 输出类型： | 模拟 |
| 电流 - 电源： | 250µA |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-TSSOP，8-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 8-MSOP |
| 包装： | 管件 |
AD8494/AD8495/AD8496/AD8497
Rev. C | Page 14 of 16
APPLICATIONS INFORMATION
BASIC CONNECTION
Figure 33 shows an example of a basic connection for the
AD849x, with a J type or K type thermocouple input.
AD849x
OUT
SENSE
REF
–VS
+VS
0.1F
10F
5V
08
52
9-
0
12
COLD JUNCTION
COMPENSATION
2
3
7
5
+IN
THERMO-
COUPLE
–IN
1M
8
1
0.1F
10F
6
IN-AMP
Figure 33. Basic Connection for the AD849x
To measure negative temperatures, apply a voltage at the refer-
ence pin to offset the output voltage at 0°C. The output voltage
of the AD849x is
VOUT = (TMJ × 5 mV/°C) + VREF
A filter at the input is recommended to remove high frequency
noise. The 1 MΩ resistor to ground enables open thermocouple
detection and proper grounding of the thermocouple. The sense
pin should be connected to the output pin of the AD849x.
Decoupling capacitors should be used to ensure clean power
supply voltages on +VS and, if using dual supplies, on VS, also.
A 0.1 μF capacitor should be placed as close as possible to each
AD849x supply pin. A 10 μF tantalum capacitor can be used
farther away from the part and can be shared.
AMBIENT TEMPERATURE SENSOR
The AD849x can be configured as a standalone Celsius thermo-
meter with a 5 mV/°C output, as shown in Figure 34. The
thermocouple sensing functionality is disabled by shorting both
AD849x inputs to ground; the AD849x simply outputs the value
from the on-board temperature sensor.
As a temperature sensor, the AD8494 has a measurement temp-
erature range of 40°C to +125°C with a precision output of
VOUT = TA × 5 mV/°C
IN-AMP
AD849x
+IN
–IN
OUT
SENSE
REF
–VS
+VS
5V
08
52
9-
0
13
COLD JUNCTION
COMPENSATION
8
2
3
5
7
1
6
Figure 34. Ambient Temperature Sensor
The AD8494 is the best choice for use as an ambient temper-
ature sensor. The AD8495, AD8496, and AD8497 can also be
configured as ambient temperature sensors, but their output
transfer functions are not precisely 5 mV/°C. For information
about the exact transfer functions of the AD8494/AD8495/
AD8496/AD8497, see the AN-1087 Application Note for
additional details.
The thermometer mode can be particularly useful for debugging
a misbehaving circuit. If the basic connection is not working,
disconnect the thermocouple and short both inputs to ground.
If the system reads the ambient temperature correctly, the
problem is related to the thermocouple. If the system does not
read the ambient temperature correctly, the problem is with
the AD849x or with the downstream circuitry.
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8494CRMZ_PROMO | 制造商:Analog Devices 功能描述:IC THERMOCOUPLE J W/COMP M |
| AD8494CRMZ-R7 | 功能描述:THERMOCOUPLE AMPLIFIER I RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
| AD8494RMZ | 制造商:Analog Devices 功能描述:FULL J-TYPE RANGE 0? TO 50? THERMOCOUPLE AMPLIFIER W/COLD JU - Rail/Tube |
| AD8495 | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Thermocouple Amplifiers with Cold Junction Compensation |
| AD8495ARMZ | 功能描述:IC THERMOCOUPLE A W/COMP 8MSOP RoHS:是 类别:集成电路 (IC) >> 接口 - 传感器和探测器接口 系列:- 其它有关文件:Automotive Product Guide 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:74 系列:- 类型:触控式传感器 输入类型:数字 输出类型:数字 接口:JTAG，串行 电流 - 电源:100µA 安装类型:表面贴装 封装/外壳:20-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:20-TSSOP 包装:管件 |
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