+VS
7
COLD JUNCTION COMPENSATION THERMOCOUPLE +IN
8
–IN
1
IN-AMP
6 5
OUT SENSE
08529-001
AD849x
2 3
REF
–VS
–IN 1 REF 2 –VS 3 NC 4
AD849x
– 8
+IN +VS OUT SENSE
08529-002
+ 7
6
5
TOP VIEW (Not to Scale) NC = NO CONNECT
MEASUREMENT JUNCTION
REFERENCE JUNCTION
THERMOCOUPLE WIRE
08529-004
PCB TRACES
AD849x
INSULATED
GROUNDED
08529-007
EXPOSED
+VS
TEMPERATURE SENSOR COLD JUNCTION COMPENSATION +IN IN-AMP G = 123.65 –IN 5mV/°C SENSE
OUT
AD849x
–VS
08529-005
REF
SENSE
–IN
ESD AND OVERVOLTAGE PROTECTION
10kΩ
A2
50kΩ
COLD JUNCTION COMPENSATION 10kΩ +IN ESD AND OVERVOLTAGE PROTECTION A1
A3 DIFF AMP G=5 50kΩ
OUT
PRE-AM P AD8494/AD8496: G = 24.73 AD8495/AD8497: G = 19.34
REF
08529-003
MEASUREMENT JUNCTION
REFERENCE JUNCTION
KEEP JUNCTION AND AD849x AT SAME TEMPERATURE
WHEN USING ISOLATED THERMOCOUPLE TIPS
PCB TRACES THERMOCOUPLE WIRE KEEP TRACES SHORT
AD849x
08529-010
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
REF
AD849x
V
REF
10MΩ
V +
AD8613
08529-006
–
08529-008
R C R
R
C
AD849x
R
AD849x
FILTER FREQUENCY =
1 2πRC
08529-009
RAILS HIGH WITH OPEN THERMOCOUPLE
RAILS LOW WITH OPEN THERMOCOUPLE
5V +VS
7
COLD JUNCTION COMPENSATION
5V +VS
7
THERMOCOUPLE
+IN
8
–IN
1
IN-AMP
6 5
OUT
COLD JUNCTION COMPENSATION
+IN
SENSE
08529-012
8
AD849x
2 3
–IN
1
IN-AMP
6 5
OUT SENSE
REF
–VS
AD849x
2 3
REF
–VS
08529-013
3.20 3.00 2.80
8
5
3.20 3.00 2.80 PIN 1 IDENTIFIER
1
5.15 4.90 4.65
4
0.65 BSC 0.95 0.85 0.75 15° MAX 1.10 MAX 0.70 0.55 0.40
0 9 1 7 0 9 -A
0.15 0.05 COPLANARITY 0.10
0.40 0.25
6° 0°
0.23 0.13
COMPLIANT TO JEDEC STANDARDS MO-187-AA
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