5962-8757104YA Analog Devices Inc, 5962-8757104YA Datasheet - Page 8

• Manufacturer Part Number: 5962-8757104YA
• Manufacturer: Analog Devices Inc

Specifications of 5962-8757104YA

• Temperature Sensor Function: Temp Sensor
• Output Type: Analog
• Operating Temperature (max): 150C
• Operating Temperature Classification: Military
• Operating Supply Voltage (min): 4V
• Operating Supply Voltage (typ): 5/9/12/15/18/24V
• Operating Supply Voltage (max): 30V
• Lead Free Status / RoHS Status: Not Compliant

AD590
Figure 12 shows a circuit in which the nonlinearity is the major
contributor to error over temperature. The circuit is trimmed
by adjusting R1 for a 0 V output with the AD590 at 0°C. R2 is
then adjusted for 10 V output with the sensor at 100°C. Other
pairs of temperatures can be used with this procedure as long as
they are measured accurately by a reference sensor. Note that
for 15 V output (150°C), the V+ of the op amp must be greater
than 17 V. Also, note that V− should be at least −4 V; if V− is
ground, there is no voltage applied across the device.
AD581
–0.8
–1.6
1.6
0.8
–2
0
2
0
–55
15V
0.8°C
MAX
35.7kΩ
–55
27kΩ
Figure 13. Typical 2-Trim Accuracy
Figure 12. 2-Temperature Trim
0
Figure 11. Nonlinearity
2kΩ
R1
TEMPERATURE (°C)
TEMPERATURE (°C)
V–
97.6kΩ
AD590
AD707A
5kΩ
30pF
R2
0.8°C MAX
100
100mV/°C
V
T
= 100mV/°C
150
150
0.8°C
MAX
Rev. E | Page 8 of 16
VOLTAGE AND THERMAL ENVIRONMENT EFFECTS
The power supply rejection specifications show the maximum
expected change in output current vs. input voltage changes.
The insensitivity of the output to input voltage allows the use of
unregulated supplies. It also means that hundreds of ohms of
resistance (such as a CMOS multiplexer) can be tolerated in
series with the device.
It is important to note that using a supply voltage other than 5 V
does not change the PTAT nature of the AD590. In other words,
this change is equivalent to a calibration error and can be
removed by the scale factor trim (see Figure 10).
The AD590 specifications are guaranteed for use in a low
thermal resistance environment with 5 V across the sensor.
Large changes in the thermal resistance of the sensor’s environment
change the amount of self-heating and result in changes in the
output, which are predictable but not necessarily desirable.
The thermal environment in which the AD590 is used
determines two important characteristics: the effect of self-
heating and the response of the sensor with time. Figure 14 is a
model of the AD590 that demonstrates these characteristics.
As an example, for the TO-52 package, θ
resistance between the chip and the case, about 26°C/W. θ
the thermal resistance between the case and the surroundings
and is determined by the characteristics of the thermal
connection. Power source P represents the power dissipated
on the chip. The rise of the junction temperature, T
ambient temperature, T
Table 4 gives the sum of θ
thermal media for both the H and F packages. The heat sink
used was a common clip-on. Using Equation 1, the temperature
rise of an AD590 H package in a stirred bath at 25°C, when
driven with a 5 V supply, is 0.06°C. However, for the same
conditions in still air, the temperature rise is 0.72°C. For a given
supply voltage, the temperature rise varies with the current and
is PTAT. Therefore, if an application circuit is trimmed with the
sensor in the same thermal environment in which it is used, the
scale factor trim compensates for this effect over the entire
temperature range.
T
J
− T
A
= P(θ
P
JC
Figure 14. Thermal Circuit Model
+ θ
CA
A
T
J
, is
)
JC
C
CH
and θ
θ
JC
T
CA
C
C
for several common
C
θ
CA
JC
is the thermal
+
–
T
A
J
, above the
CA
is
(1)