AD8497BRMZ-R7 [ADI]
Thermocouple Amplifiers With Cold Junction Compensation; 热电偶放大器，冷端补偿
| 型号： | AD8497BRMZ-R7 |
| 厂家： | 
ADI |
| 描述： | Thermocouple Amplifiers With Cold Junction Compensation |
| 文件： | 总15页 (文件大小：2229K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
+V
S
7
COLD JUNCTION
COMPENSATION
THERMOCOUPLE
+IN
8
1
OUT
6
5
IN-AMP
–IN
SENSE
AD849x
2
3
–V
REF
S
AD849x
–IN
1
2
3
4
8
7
6
5
+IN
+V
–
+
REF
S
–V
OUT
S
NC
SENSE
TOP VIEW
(Not to Scale)
NC = NO CONNECT
MEASUREMENT
JUNCTION
REFERENCE
JUNCTION
PCB
TRACES
AD849x
THERMOCOUPLE WIRE
INSULATED
GROUNDED
EXPOSED
+V
S
TEMPERATURE
SENSOR
COLD JUNCTION
COMPENSATION
+IN
5mV/°C
SENSE
IN-AMP
OUT
–IN
AD849x
REF
–V
S
SENSE
ESD AND
OVERVOLTAGE
PROTECTION
50kΩ
–IN
10kΩ
A2
COLD JUNCTION
COMPENSATION
A3
OUT
DIFF AMP
G = 5
10kΩ
ESD AND
A1
OVERVOLTAGE
PROTECTION
+IN
50kΩ
PRE-AMP
A
A
REF
KEEP JUNCTION AND
AD849x AT SAME
TEMPERATURE
MEASUREMENT
JUNCTION
REFERENCE
JUNCTION
WHEN USING ISOLATED THERMOCOUPLE TIPS
PCB
TRACES
AD849x
KEEP
TRACES
SHORT
THERMOCOUPLE WIRE
RAILS HIGH WITH OPEN
THERMOCOUPLE
RAILS LOW WITH OPEN
THERMOCOUPLE
WHEN USING EXPOSED OR GROUNDED THERMOCOUPLE TIPS
ELECTRICAL CONNECTION OCCURS AT TIP.
VOLTAGE MUST STAY IN INPUT VOLTAGE
RANGE OF AD849x.
INCORRECT
CORRECT
WHEN THERMOCOUPLE TIP TYPE IS UNKNOWN
AD849x
AD849x
REF
REF
V
V
+
AD8613
–
R
R
C
C
R
R
AD849x
AD849x
RAILS HIGH WITH OPEN
THERMOCOUPLE
RAILS LOW WITH OPEN
THERMOCOUPLE
1
FILTER FREQUENCY =
2πRC
5V
+V
S
7
5V
+V
COLD JUNCTION
COMPENSATION
S
7
THERMOCOUPLE
+IN
COLD JUNCTION
COMPENSATION
8
1
OUT
6
5
IN-AMP
–IN
+IN
8
1
SENSE
OUT
AD849x
6
5
IN-AMP
–IN
2
3
SENSE
–V
REF
S
AD849x
2
3
–V
REF
S
3.20
3.00
2.80
8
1
5
4
5.15
4.90
4.65
3.20
3.00
2.80
PIN 1
IDENTIFIER
0.65 BSC
0.95
0.85
0.75
15° MAX
1.10 MAX
0.70
0.55
0.40
0.15
0.05
0.23
0.13
6°
0°
0.40
0.25
COPLANARITY
0.10
COMPLIANT TO JEDEC STANDARDS MO-187-AA
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ADI
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