AD590 [INTERSIL]
2-Wire, Current Output Temperature Transducer; 2线，电流输出温度传感器
| 型号： | AD590 |
| 厂家： | 
Intersil |
| 描述： | 2-Wire, Current Output Temperature Transducer |
| 文件： | 总10页 (文件大小：99K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
AD590
2-Wire, Current Output
Temperature Transducer
August 1997
Features
Description
o
The AD590 is an integrated-circuit temperature transducer
which produces an output current proportional to absolute tem-
perature. The device acts as a high impedance constant current
• Linear Current Output . . . . . . . . . . . . . . . . . . . . 1µA/ K
o
o
• Wide Temperature Range . . . . . . . . . . . -55 C to 150 C
• Two-Terminal Device Voltage In/Current Out
• Wide Power Supply Range . . . . . . . . . . . . .+4V to +30V
• Sensor Isolation From Case
o
regulator, passing 1µA/ K for supply voltages between +4V and
+30V. Laser trimming of the chip's thin film resistors is used to
calibrate the device to 298.2µA output at 298.2 K (25 C).
o
o
The AD590 should be used in any temperature-sensing
o
o
application between -55 C to 150 C in which conventional
electrical temperature sensors are currently employed. The
inherent low cost of a monolithic integrated circuit combined
with the elimination of support circuitry makes the AD590 an
attractive alternative for many temperature measurement sit-
uations. Linearization circuitry, precision voltage amplifiers,
resistance measuring circuitry and cold junction compensa-
tion are not needed in applying the AD590. In the simplest
application, a resistor, a power source and any voltmeter can
be used to measure temperature.
• Low Cost
Ordering Information
NON-
PART
LINEARITY TEMP. RANGE
PKG.
NO.
o
o
NUMBER
( C)
( C)
PACKAGE
AD590IH
±3.0
±1.5
-55 to 150
-55 to 150
3 Ld Metal Can T3.A
(TO-52)
AD590JH
3 Ld Metal Can T3.A
(TO-52)
In addition to temperature measurement, applications include
temperature compensation or correction of discrete
components, and biasing proportional to absolute temperature.
The AD590 is particularly useful in remote sensing applica-
tions. The device is insensitive to voltage drops over long
lines due to its high-impedance current output. Any well
insulated twisted pair is sufficient for operation hundreds of
feet from the receiving circuitry. The output characteristics
also make the AD590 easy to multiplex: the current can be
switched by a CMOS multiplexer or the supply voltage can
be switched by a logic gate output.
Pinout
Functional Diagram
+
AD590
(METAL CAN)
R1 260Ω R2 1040Ω
Q5
Q3
Q2
+
Q1
Q4
1
Q6
CASE
3
C1 26pF
Q12
Q7
Q8
2
-
CHIP
SUBSTRATE
R3 5kΩ
R4 11kΩ
Q10
Q9
8
Q11
1
1
R6 820Ω
R5 146Ω
-
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
File Number 3171.1
http://www.intersil.com or 407-727-9207 | Copyright © Intersil Corporation 1999
12-3
AD590
o
Absolute Maximum Ratings T = 25 C
Thermal Information
A
o
o
Supply Forward Voltage (V+ to V-) . . . . . . . . . . . . . . . . . . . . . . +44V
Supply Reverse Voltage (V+ to V-) . . . . . . . . . . . . . . . . . . . . . . .-20V
Breakdown Voltage (Case to V+ to V-). . . . . . . . . . . . . . . . . . ±200V
Thermal Resistance (Typical, Note 1)
Metal Can Package . . . . . . . . . . . . . . .
θ
( C/W)
θ
( C/W)
JA
JC
200
120
o
Maximum Junction Temperature (Metal Can Package) . . . . . . . 175 C
Maximum Storage Temperature Range . . . . . . . . . .-65 C to 150 C
Maximum Lead Temperature (Soldering 10s) . . . . . . . . . . . . . 300 C
o
o
o
o
Rated Performance Temperature Range TO-52. . . . -55 C to 150 C
o
Operating Conditions
o
o
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . -55 C to 150 C
CAUTION: Stresses above those listed in “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress only rating and operation
of the device at these or any other conditions above those indicated in the operational sections of this specification is not implied.
NOTE:
1. θ is measured with the component mounted on an evaluation PC board in free air.
JA
ο
Electrical Specifications Typical Values at T = 25 C, V+ = 5V, Unless Otherwise Specified
A
PARAMETER
TEST CONDITIONS
AD590I
298.2
AD590J
298.2
UNITS
o
o
Nominal Output Current at 2 C (298.2 K)
µA
o
Nominal Temperature Coefficient
1.0
1.0
µA/ K
o
o
Calibration Error at 25 C
Notes 1, 5
±10.0 Max
±5.0 Max
C
o
o
Absolute Error
-55 C to 150 C, Note 7
o
Without External Calibration Adjustment
±20.0 Max
±5.8 Max
±3.0 Max
±0.1 Max
±0.1 Max
40
±10.0 Max
±3.0 Max
±1.5 Max
±0.1 Max
±0.1 Max
40
C
o
With External Calibration Adjustment
Non-Linearity
C
o
Note 6
C
o
Repeatability
Notes 2, 6
Notes 3, 6
C
o
Long Term Drift
C/Month
Current Noise
pA/√Hz
Power Supply Rejection
+4V < V+ < +5V
0.5
0.2
0.1
0.5
0.2
0.1
µA/V
µA/V
µA/V
Ω
+5V < V+ < +15V
+15V < V+ < +30V
10
10
Case Isolation to Either Lead
Effective Shunt Capacitance
Electrical Turn-On Time
Reverse Bias Leakage Current
Power Supply Range
NOTES:
10
10
100
20
100
20
pF
Note 1
Note 4
µs
10
10
pA
+4 to +30
+4 to +30
V
2. Does not include self heating effects.
o
o
o
3. Maximum deviation between 25 C reading after temperature cycling between -55 C and 150 C.
o
4. Conditions constant +5V, constant 125 C.
o
5. Leakage current doubles every 10 C.
6. Mechanical strain on package may disturb calibration of device.
7. Guaranteed but not tested.
o
o
o
8. -55 C Guaranteed by testing at 25 C and 150 C.
12-4
AD590
Trimming Out Errors
+10V
The ideal graph of current versus temperature for the AD590
is a straight line, but as Figure 1 shows, the actual shape is
slightly different. Since the sensor is limited to the range of
-55oC to 150oC, it is possible to optimize the accuracy by
trimming. Trimming also permits extracting maximum
performance from the lower-cost sensors.
35.7kΩ
2kΩ
97.6kΩ
R 5kΩ
2
R
1
+
o
V
= 100mV/ C
OUT
AD590
-
The circuit of Figure 2 trims the slope of the AD590 output.
The effect of this is shown in Figure 3.
R
R
= OFFSET
= SLOPE
1
2
V-
The circuit of Figure 4 trims both the slope and the offset.
This is shown in Figure 5. The diagrams are exaggerated to
show effects, but it should be clear that these trims can be
used to minimize errors over the whole range, or over any
selected part of the range. In fact, it is possible to adjust the
I-grade device to give less than 0.1oC error over the range
0oC to 90oC and less than 0.05oC error from 25oC to 60oC.
FIGURE 4. SLOPE AND OFFSET TRIMMING
IDEAL
ACTUAL
(GREATLY
EXAGGERATED)
FIGURE 5A. UNTRIMMED
FIGURE 5B. TRIM ONE: OFFSET
FIGURE 5C. TRIM TWO: SLOPE
o
T ( K)
FIGURE 1. TRIMMING OUT ERRORS
+5V
+
+
AD590
-
+
R 100Ω
o
V
= 1mV/ K
OUT
950Ω
R = SLOPE
FIGURE 2. SLOPE TRIMMING
IDEAL
ACTUAL
TRIMMED
o
T ( K)
FIGURE 3. EFFECT OF SLOPE TRIM
12-5
AD590
Accuracy
Maximum errors over limited temperature spans, with
= +5V, are listed by device grade in the following tables.
V
S
The tables reflect the worst-case linearities, which invariably
occur at the extremities of the specified temperature range.
The trimming conditions for the data in the tables are shown
in Figure 2 and Figure 4.
All errors listed in the tables are ±oC. For example, if ±1oC
maximum error is required over the 25oC to 75oC range (i.e.,
lowest temperature of 25oC and span of 50oC), then the
trimming of a J-grade device, using the single-trim circuit
(Figure 2), will result in output having the required accuracy
over the stated range. An I-grade device with two trims
(Figure 4) will have less than ±0.2oC error. If the requirement
is for less than ±1.4oC maximum error, from -25oC to 75oC
(100oC span from -25oC), it can be satisfied by an I-grade
device with two trims.
FIGURE 5D. TRIM THREE: OFFSET AGAIN
FIGURE 5. EFFECT OF SLOPE AND OFFSET TRIMMING
o
I Grade Maximum Errors ( C)
o
LOWEST TEMPERATURE IN SPAN ( C)
NUMBER OF
TRIMS
TEMPERATURE
o
SPAN ( C)
-55
8.4
-25
9.2
10.4
13.0
16.0
19.0
-
0
10.0
11.0
12.8
16.6
19.2
-
25
50
11.6
12.0
14.6
18.8
-
75
100
125
None
None
None
None
None
None
One
10
25
10.8
12.4
13.2
14.4
10.0
13.0
15.2
18.4
20.0
0.6
11.8
13.8
15.0
16.0
50
13.8
16.4
18.0
-
100
150
205
10
17.4
-
-
-
-
-
-
-
-
-
-
-
-
0.4
1.2
3.0
4.5
4.8
-
0.4
1.0
2.0
4.2
5.5
-
0.4
0.4
1.0
2.0
5.0
-
0.4
1.2
3.0
-
0.4
1.6
3.8
-
0.6
One
25
1.8
1.0
1.8
One
50
3.8
2.0
-
One
100
150
205
10
4.8
4.2
-
One
5.5
-
-
-
-
One
5.8
-
-
-
-
-
Two
0.3
0.2
0.3
0.6
1.4
2.0
-
0.1
0.2
0.4
1.0
2.8
-
(Note 9)
(Note 9)
0.1
0.2
2.5
-
0.1
0.2
0.3
-
0.2
0.3
0.7
-
0.3
Two
25
0.5
(Note 9)
0.5
Two
50
1.2
0.2
2.0
-
-
-
-
-
Two
100
150
205
1.8
Two
2.6
-
-
Two
3.0
-
-
-
-
NOTE:
o
9. Less than ±0.05 C.
12-6
AD590
o
J Grade Maximum Errors ( C)
o
LOWEST TEMPERATURE IN SPAN ( C)
NUMBER OF
TRIMS
TEMPERATURE
o
SPAN ( C)
-55
4.2
5.0
6.5
7.7
9.2
10.0
0.3
0.9
1.9
2.3
2.5
3.0
0.1
0.2
0.4
0.7
1.0
1.6
-25
4.6
5.2
6.5
8.0
9.5
-
0
25
5.4
5.9
6.9
8.7
-
50
5.8
6.0
7.3
9.4
-
75
6.2
6.9
8.2
-
100
6.6
7.5
9.0
-
125
None
10
25
5.0
5.5
6.4
8.3
9.6
-
7.2
None
None
None
None
None
One
8.0
50
-
100
150
205
10
-
-
-
-
-
-
-
-
-
0.2
0.6
1.5
2.2
2.4
-
0.2
0.5
1.0
2.0
2.5
-
0.2
0.5
1.0
2.0
-
0.2
0.5
1.0
2.3
-
0.2
0.6
1.5
-
0.2
0.8
1.9
-
0.3
One
25
0.9
One
50
-
One
100
150
205
10
-
One
-
-
-
One
-
-
-
-
-
Two
(Note 10) (Note 10) (Note 10) (Note 10) (Note 10) (Note 10)
0.1
Two
25
0.1
0.2
0.5
0.7
-
(Note 10) (Note 10) (Note 10) (Note 10)
0.1
0.2
Two
50
0.1
0.3
1.2
-
(Note 10) (Note 10)
0.1
0.2
(Note 10)
Two
100
150
205
0.7
1.0
-
-
-
-
-
-
-
-
-
Two
-
-
-
-
Two
NOTE:
o
10. Less than ±0.05 C.
NOTES
Repeatability Errors arise from a strain hysteresis of the
package. The magnitude of this error is solely a function of
the magnitude of the temperature span over which the
1. Maximum errors over all ranges are guaranteed based on
the known behavior characteristic of the AD590.
o
device is used. For example, thermal shocks between 0 C
o
o
2. For one-trim accuracy specifications, the 205 C span is
and 100 C involve extremely low hysteresis and result in
o
o
assumed to be trimmed at 25 C; for all other spans, it is
assumed that the device is trimmed at the midpoint.
repeatability errors of less than ±0.05 C. When the thermal-
o
o
shock excursion is widened to -55 C to 150 C, the device
o
will typIcally exhibit a repeatability error of ±0.05 C (±0.10
o
3. For the 205 C span, it is assumed that the two-trim
guaranteed maximum).
o
o
temperatures are in the vicinity of 0 C and 140 C; for all
other spans, the specified trims are at the endpoints.
Long Term Drift Errors are related to the average operating
temperature and the magnitude of the thermal-shocks
experienced by the device. Extended use of the AD590 at
4. In precision applications, the actual errors encountered
are usually dependent upon sources of error which are
often overlooked in error budgets. These typically
include:
o
temperatures above 100 C typically results in long-term drift
o
o
of ±0.03 C per month; the guaranteed maximum is ±0.10 C
per month. Continuous operation at temperatures below
a. Trim error in the calibration technique used
b. Repeatability error
o
100 C induces no measurable drifts in the device. Besides
the effects of operating temperature, the severity of thermal
shocks incurred will also affect absolute stability. For
c. Long term drift errors
o
thermal-shock excursions less than 100 C, the drift is diffi-
o
o
o
Trim Error is usually the largest error source. This error
arises from such causes as poor thermal coupling between
the device to be calibrated and the reference sensor; refer-
ence sensor errors; lack of adequate time for the device
being calibrated to settle to the final temperature; radically
different thermal resistances between the case and the sur-
cult to measure (<0.03 C). However, for 200 C excursions,
the device may drift by as much as ±0.10 C after twenty
such shocks. If severe, quick shocks are necessary in the
application of the device, realistic simulated life tests are rec-
ommended for a thorough evaluation of the error introduced
by such shocks.
roundings (R
device.
) when trimming and when applying the
CA
θ
12-7
AD590
Typical Applications
+15V
+
+5V
+
+
(ADDITIONAL SENSORS)
-
-
-
+
AD590
-
Σ
V
(AVG) = (R)
i
OUT
n
o
V
= 1mV/ K
OUT
333.3Ω
0.1%
1kΩ
(FOR 3 SENSORS)
FIGURE 8. AVERAGE TEMPERATURE SENSING SCHEME
FIGURE 6A.
The sum of the AD590 currents appears across R, which is
10kΩ
chosen by the formula:
,
R = --------------
n
where n = the number of sensors. See Figure 8.
HEATER
ELEMENT
423
298.2
218
+15V
+
R
AD590
B
LM311
3
-
7
2
R
1
1
4
o
o
o
218 K
298.2 K
423 K
R
0.1%
o
o
o
R
R
(-55 C)
(25 C)
(150 C)
2
C
ICL8069
1.23V
TEMPERATURE
FIGURE 6B.
V
ZERO
3
FIGURE 6. SIMPLE CONNECTION. OUTPUT IS PROPORTIONAL
TO ABSOLUTE TEMPERATURE
FIGURE 9. SINGLE SETPOINT TEMPERATURE CONTROLLER
The AD590 produces a temperature-dependent voltage
across R (C is for filtering noise). Setting R produces a
scale-zero voltage. For the celsius scale, make R = 1kΩ
+15V
+
2
and V
= 0.273V. For Fahrenheit, R = 1.8kΩ and
ZERO
= 0.460V. See Figure 9.
V
ZERO
-
+
500µA
-
+
M
AD590 (AS MANY AS DESIRED)
-
+
4V < V
BATT
<30V
+
+
-
AD590
V
(MIN)
-
OUT
-
10kΩ
0.1%
FIGURE 7. LOWEST TEMPERATURE SENSING SCHEME.
AVAILABLE CURRENT IS THAT OF THE
“COLDEST” SENSOR
FIGURE 10. SIMPLEST THERMOMETER
Meter displays current output directly in degrees Kelvin.
using the AD590J, sensor output is within ±10 degrees over
the entire range. See Figure 10.
12-8
AD590
o
The Kelvin scale version reads from
0
to 1999 K
theoretically, and from 223 K to 473 K actually. The 2.26kΩ
resistor brings the input within the ICL7106 V range: 2
V+
o
o
CM
R
R
R
1
2
3
general-purpose silicon diodes or an LED may be substi-
tuted. See Figure 12 and notes below.
REF HI
REF LO
R
ICL8069
1.235V
V+
ICL7106
7.5kΩ
R
IN HI
4
5
12kΩ
SCALE
ADJ
ZERO
ADJ
REF HI
R
5kΩ
REF LO
COMMON
IN LO
1.000V
5kΩ
15kΩ
+
ICL7106
402Ω
26.1kΩ
AD590
IN HI
-
V-
1kΩ
0.1%
COMMON
IN LO
FIGURE 11. BASIC DIGITAL THERMOMETER, CELSIUS AND
FAHRENHEIT SCALES
+
R
R
R
R
R
R
5
1
2
3
4
AD590
o
o
-
F
9.00
5.00
4.02
4.02
2.0
2.0
12.4
5.11
10.0
5.0
0
V-
C
11.8
FIGURE 13. BASIC DIGITAL THERMOMETER, KELVIN SCALE
WITH ZERO ADJUST
5
R
= 28kΩ nominal
∑
n
n = 1
This circuit allows “zero adjustment” as well as slope
adjustment. the ICL8069 brings the input within the com-
mon-mode range, while the 5kΩ pots trim any offset at
ALL values are in kΩ.
o
o
The ICL7106 has a V span of ±2.0V and a V
range of 218 K (-55 C), and set the scale factor. See Figure 13 and
IN CM
(V+ -0.5V) to (V- +1V). R is scaled to bring each range within notes below.
while not exceeding V . V for both scales is
V
CM
IN
REF
Notes for Figure 11, Figure 12 and Figure 13
o
500mV maximum rending on the celsius range 199.9 C
limited by the (short-term) maximum allowable sensor tem-
perature. Maximum reading on the fahrenheit range is
199.9 F (93.3 C) limited by the number of display digits.
See Figure 11 and notes below.
Since all 3 scales have narrow V spans, some optimization
lN
of ICL7106 components can be made to lower noise and
preserve CMR. The table below shows the suggested val-
ues. Similar scaling can be used with the ICL7126 and
ICL7136.
o
o
V+
SCALE
V
RANGE (V)
R
(kΩ)
C
(µF)
lN
lNT
AZ
7.5kΩ
REF HI
SCALE
K
C
F
0.223 to 0.473
-0.25 to +1.0
220
0.47
ADJ
5kΩ
REF LO
220
220
0.1
0.1
ICL7106
2.26kΩ
1.00kΩ
15kΩ
-0.29 to +0.996
IN HI
For all:
C
C
C
R
= 0.1µF
= 0.22µF
=100pF
= 100kΩ
REF
lNT
COMMON
IN LO
OSC
OSC
+
AD590
-
V-
FIGURE 12. BASIC DIGITAL THERMOMETER, KELVIN SCALE
12-9
AD590
+15V
1kΩ
ZERO SET
+
+
NO. 1
AD590
44.2kΩ
-
-
10kΩ
741
5MΩ
o
ICL7611
10mV/ C
V+
50kΩ
-
+
-
V
= (T - T ) x
2 1
+
OUT
(8V MIN)
o
+
(10mV/ C)
118kΩ
20kΩ
FULL-SCALE
ADJUST
V-
115kΩ
NO. 2
10kΩ
0.1%
-
10kΩ
100Ω
+100µA
M
10kΩ
2.7315V
-
FIGURE 15. DIFFERENTIAL THERMOMETER
o
o
FIGURE 14. CENTIGRADE THERMOMETER (0 C-100 C)
The reference junction(s) should be in close thermal contact
with the AD590 case. V+ must be at least 4V, while ICL8069
current should be set at 1mA - 2mA. Calibration does not
The ultra-low bias current of the ICL7611 allows the use of
large value gain resistors, keeping meter current error under
/ %, and therefore saving the expense of an extra meter
2
require shorting or removal of the thermocouple: set R for
1
1
V
= 10.98mV. If very precise measurements are needed,
2
adjust R to the exact Seebeck coefficient for the thermo-
driving amplifier. See Figure 14.
2
couple used (measured or from table) note V , and set R to
1
1
The 50kΩ pot trims offsets in the devices whether internal or
external, so it can be used to set the size of the difference
interval. this also makes it useful for liquid level detection
(where there will be a measurable temperature difference).
See Figure 15.
buck out this voltage (i.e., set V = V ). For other thermocou-
2
1
ple types, adjust values to the appropriate Seebeck
coefficient. See Figure 16.
V+
+
o
1µA/ K
SEEBECK
o
-
COEFFICIENT = 40µV/ K
-
TYPE K
+
o
R
40.2Ω
T
= 40µV/ K
V = 10.98mV
1
2
C
V+
+
V
OUT
-
1.235V
R
4521Ω
1
V
= 10.98mV
2
40.2Ω
4.7µF
ICL8069
FIGURE 16. COLD JUNCTION COMPENSATION FOR TYPE K THERMOCOUPLE
12-10
AD590
COLUMN
SELECT
ROW
SELECT
+15V
+15V
ENABLE
2
ENABLE
2
R
13
15
16
1
15 16 1
(OPTIONAL)
8
13
2
1
0
D
HI-0548
8-CHANNEL
MUX
4
GND V- 7
6
5
3
2
1
0
4
3
14
9
10
11
12
7
6
5
4
5
0
1
2
6
7
HI-0548
8-CHANNEL
MUX
3
12
11
4
5
6
7
10
9
3
V-
D
GND
8
14
R
(OPTIONAL)
V
10kΩ 0.1%
OUT
AD590 (64)
FIGURE 17. MULTIPLEXING SENSORS
If shorted sensors are possible, a series resistor in series
with the D line will limit the current (shown as R, above: only
one is needed). A six-bit digital word will select one of 64
sensors.
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AD590
Die Characteristics
DIE DIMENSIONS:
PASSIVATION:
37 mils x 58 mils x 14 mils ±1 mil
Type: PSG/Nitride
PSG Thickness: 7kÅ ±1.4kÅ
Nitride Thickness: 8kÅ ±1.2kÅ
METALLIZATION:
Type: Aluminum 100%
Thickness: 15kÅ ±1kÅ
Metallization Mask Layout
AD590
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Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design and/or specifications at any time without
notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be accurate
and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third parties which
may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
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