AD590JR Analog Devices Inc, AD590JR Datasheet - Page 9

• Manufacturer Part Number: AD590JR
• Description: TEMPERATURE TRANSDUCER IC
• Manufacturer: Analog Devices Inc

Specifications of AD590JR

• Rohs Compliant: NO
• Rohs Status: RoHS non-compliant
• Sensing Temperature: -55°C ~ 150°C
• Output Type: Current
• Voltage - Supply: 4 V ~ 30 V
• Accuracy: ±5°C
• Package / Case: 8-SOIC (0.154", 3.90mm Width)

Table 4. Thermal Resistance
Medium
Aluminum Block
Stirred Oil
Moving Air
Still Air
1
2
3
The time response of the AD590 to a step change in
temperature is determined by the thermal resistances and the
thermal capacities of the chip, C
about 0.04 Ws/°C for the AD590. C
medium, because it includes anything that is in direct thermal
contact with the case. The single time constant exponential
curve of Figure 15 is usually sufficient to describe the time
response, T (t). Table 4 shows the effective time constant, τ, for
several media.
τ is dependent upon velocity of oil; average of several velocities listed above.
Air velocity @ 9 ft/sec.
The time constant is defined as the time required to reach 63.2% of an
instantaneous temperature change.
With Heat Sink
Without Heat Sink
With Heat Sink
Without Heat Sink
2
3
H
30
42
45
115
191
480
(°C/Watt)
θ
JC
CH
+ θ
, and the case, C
C
CA
F
10
60
–
190
–
650
varies with the measured
H
0.6
1.4
5.0
13.5
108
60
C
. C
τ (sec)
CH
is
F
0.1
0.6
–
10.0
–
30
1
Rev. E | Page 9 of 16
T
T
INITIAL
FINAL
τ
Figure 15. Time Response Curve
T(t) = T
INITIAL
+ (T
TIME
FINAL
4τ
– T
INITIAL
)
×
(1 – e
–t/τ
)
AD590