Intersil ISL71590SEHVX Radiation hardened Datasheet

DATASHEET
Radiation Hardened, 2-Terminal Temperature Transducer
ISL71590SEH
Features
The ISL71590SEH is a temperature-to-current transducer
possessing two terminals. It has a high impedance current output
that allows it to be insensitive to voltage drops across long lines.
When provided a differential voltage between 4V and 33V, the
device acts as a constant current regulator that generates a
current equal to 1µA/Kelvin (K).
• 50krad(Si) low dose rate (ELDRS) shift . . . . . . . . . . . . . < 1°C
The ISL71590SEH is specified across the -55°C to +125°C
temperature range and with ±1.7°C accuracy without the
need of additional circuitry, and also capable of operating up
to +150°C. With power requirements as low as 1.5mW (5V at
+25°C), it is an ideal choice for remote sensing applications as
any well-insulated twisted pair cable will allow for proper
operation. It can be used in several additional applications
including temperature compensation networks, flow rate
analysis, anemometry and biasing proportional to absolute
temperature.
The high output impedance (>10MΩ) leaves plenty of room for
variations in the power supply voltage. It is electrically durable
as it can withstand a forward operating voltage of 33V over the
full temperature range both under and without ion beam
radiation and a reverse voltage of -40V.
The ISL71590SEH is available in a 2 Ld flatpack and die forms.
Applications
• Linear output current . . . . . . . . . . . . . . . . . . . . . . . . . . . 1µA/K
• Wide power supply input range (V+ to V-) . . . . . . . 4V to 33V
• Low power consumption . . . . . . . . . . . . . . . . . . 1.5mW at 5V
• High output impedance provides excellent rejection to
variations in the supply line
• Additional linearization circuitry is not needed for operation
• Operating temperature range. . . . . . . . . . . . -55°C to +150°C
• QML qualified per MIL-PRF-38535 requirements
• Radiation environment
- SEL/SEB LETTH . . . . . . . . . . . . . . . . . . . 86.4 MeV•cm2/mg
- Total dose, high dose rate . . . . . . . . . . . . . . . . . 300krad(Si)
- Total dose, low dose rate . . . . . . . . . . . . . . . . . 50krad(Si)*
* Product capability established by initial characterization. The
EH version is acceptance tested on a wafer-by-wafer basis to
50krad(Si) at low dose rate.
• Electrically screened to SMD# 5962-13215
Related Literature
• AN1844, “ISL71590SEHXX Evaluation Board User’s Guide”
• AN1895, “Total Dose Testing of the ISL71590SEH Radiation
Hardened Temperature Sensor”
• RF power amplifier bias compensation
• AN1894, “Single Event Effects (SEE) Testing of the
ISL71590SEH Temperature Sensor”
• LCD bias compensation
• Laser diode bias compensation
• Sensor bias and linearization
• Data acquisition systems
+4V to +33V (V+ TO V-)
T
VOUT = 1mV/K
1kΩ
0.1%
ISL71590SEH
OUTPUT CURRENT DELTA (µA)
+
0.0
-0.2
-0.4
HDR
-0.6
-0.8
LDR
-1.0
-1.2
0
25
50
100
125
150
200
250
300
TOTAL DOSE (krad(Si))
FIGURE 1. TYPICAL APPLICATION
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FIGURE 2. IOUT SHIFT vs LOW/HIGH DOSE RATE RADIATION
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
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ISL71590SEH
Ordering Information
ORDERING / SMD NUMBER
(Note 2)
PART NUMBER
(Note 1)
TEMPERATURE RANGE
(°C)
PACKAGE
(RoHS Compliant)
5962F1321501VXC
ISL71590SEHVF
-55 to +125
2 Ld Flatpack
5962F1321501V9A
ISL71590SEHVX
-55 to +125
Die
N/A
ISL71590SEHF/PROTO
-55 to +125
2 Ld Flatpack
N/A
ISL71590SEHX/SAMPLE
-55 to +125
Die
N/A
ISL71590SEHMF
-55 to +125
2 Ld Flatpack
ISL71590SEHEV1Z
PKG.
DWG. #
K2.A
K2.A
K2.A
Evaluation Board
NOTES:
1. These Intersil Pb-free Hermetic packaged products employ 100% Au plate - e4 termination finish, which is RoHS compliant and compatible with both
SnPb and Pb-free soldering operations.
2. Specifications for Rad Hard QML devices are controlled by the Defense Logistics Agency Land and Maritime (DLA). The SMD numbers listed must be
used when ordering.
Pin Configuration
ISL71590SEH
(2 LD FLATPACK)
TOP VIEW
V+
1
V-
2
Pin Descriptions
ISL71590SEH
(2 Ld FLATPACK)
PIN NAME
EQUIVALENT ESD CIRCUIT
1
V+
Circuit 1
Positive Voltage lead Range 4V to 33V
2
V-
Circuit 1
Negative Voltage lead
DESCRIPTION
V+
+
ESD
CIRCUIT
V-
T
-
Circuit 1
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ISL71590SEH
Functional Block Diagram
1
+
ISL71590SEH
T
-
2
FIGURE 3. BLOCK DIAGRAM
Typical Applications
VS = +14V
VS = +12V
+
T
T
ISL71590SEH
T
+
T
T
-
1
-
Maximum number = (VSmin - VOUTmax)/4V
2
-
n
VOUT = (Io1+Io2 -- +Ion).R
n
T
R
-
+
+
+
+
Where n = number of ISL71590SEH
VOUT = 1mV/K
1kΩ
0.1%
e.g., with 4 sensors and R = 250Ω VOUT = 1mV/K)
FIGURE 4. LOWEST TEMPERATURE SENSING SCHEME. OUTPUT
CURRENT IS THAT OF THE “COLDEST” SENSOR
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FIGURE 5. AVERAGE TEMPERATURE SENSING SCHEME. OUTPUT
CURRENT IS THE SUM OF ALL SENSOR CURRENTS
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ISL71590SEH
Absolute Maximum Ratings
Thermal Information
Maximum Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40V
In-Beam Maximum Supply Voltage (Note 5) . . . . . . . . . . . . . . . . . . . . . . 37V
Maximum Reverse Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .-40V
Maximum Differential Input Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±40V
Case to Lead Breakdown Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±200V
ESD Rating
Human Body Model (Tested per MIL-STD-883 TM3015.7) . . . . . . . . 3kV
Machine Model (Tested per EIA/JESD22-A115-A) . . . . . . . . . . . . . . 300V
Charged Device Model (Tested per JESD22-C101D) . . . . . . . . . . . . 750V
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
2 Ld Flatpack (Notes 3, 4) . . . . . . . . . . . . . .
80
8
Storage Temperature Range. . . . . . . . . . . . . . . . . . . . . . . .-65°C to +155°C
Maximum Junction Temperature (TJMAX) . . . . . . . . . . . . . . . . . . . . .+150°C
Recommended Operating Conditions
Ambient Operating Temperature Range . . . . . . . . . . . . . .-55°C to +125°C
Maximum Operating Junction Temperature . . . . . . . . . . . . . . . . . .+150°C
Supply Voltage (V+ to V-) (Notes 5, 6) . . . . . . . . . . . . . . . . . . . . . . 4V to 33V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
3. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
4. For JC, the “case temp” location is the center of the ceramic on the package underside.
5. The maximum supply voltage specified is for operation in a heavy ion environment at an LET = 86.4 MeV•cm2/mg.
6. The maximum voltage beyond which output current performance is not to be considered valid (Figure 9).
Electrical Specifications
-55°C to +125°C.
SYMBOL
Vs = 5V, TA = +25°C, unless otherwise noted. Boldface limits apply across the operating temperature range,
PARAMETER
VS
Power Supply Voltage Range
IO
Nominal Current Output
E
Ambient Error Accuracy
TCIO
TEST CONDITIONS
(V+ to V-) (Note 5)
MIN
(Note 7)
TYP
4
MAX
(Note 7)
UNIT
31
V
298.1
-0.50
Current Output Temperature Coefficient
-0.05
µA
0.50
1
°C
µA/K
EA
Absolute Error without External Calibration
Over full temperature range
-2.0
2.0
°C
NL
Nonlinearity
At 5 discrete temperature points
-0.5
0.5
°C
RPT
Repeatability
After temperature range end point
cycling
-0.1
0.1
°C
dE/dt
Long Term Drift
V+ = 31V for 1khr at +125°C
-0.05
0.25
°C
PSRR
Output Current VS Rejection
-0.25
5V > VS >4V
0.05
0.50
µA/V
5V ≤ VS ≤ 15V
0.03
0.20
µA/V
5V ≤ VS ≤ 31V
0.04
0.10
µA/V
Vnd
Voltage Noise Density
f = 100Hz
0.03
µV/√Hz
Ind
Current Noise Density
f = 100Hz
30
pA/√Hz
Iso
Case Isolation to Either Lead
Case to lead voltage = 200V
1010
Ω
CS
Effective Shunt Capacitance
f = 10Hz
65
pF
tON
Electrical Turn-On Time
VS = 4V to IOUT stable
2
µs
-10V Reverse Bias Leakage Current
+125°C = Worst case
50
nA
Post Low Dose Rate Radiation (LDR)
Ambient Error 50krad at 0.01 rad(Si)/s
Ambient error accuracy plus TID shift
(Note 8)
-2.0
0.5
°C
Post High Dose Rate Radiation (HDR)
Ambient Error 300krad at 70 rad(Si)/s
Ambient error accuracy plus TID shift
(Note 8)
-2.0
0.5
°C
ILEAK
POST RADIATION
E-RADD
(Figure 19)
NOTES:
7. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
8. The post radiation Ambient Error specs are defined as the absolute temperature error.
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ISL71590SEH
TABLE 1. BURN-IN AND LIFE TEST DELTA PARAMETERS
PARAMETER
SYMBOL
BURN-IN
END POINT
BURN-IN
DELTA
MIL-STD GROUP C
END POINT
MIL-STD GROUP C
DELTA
UNITS
Ambient Error (+25°C)
E
0.5
0.25
0.5
0.25
°C
Typical Performance Curves Unless otherwise specified, VS = 5V, TA = +25°C.
450
298.7
298.6
OUTPUT CURRENT (µA)
OUTPUT CURRENT (µA)
400
350
300
250
298.5
298.4
298.3
298.2
298.1
298.0
297.9
-55
-45
-35
-25
-15
-5
5
15
25
35
45
55
65
75
85
95
105
115
125
135
145
155
200
4
10 12 14 16 18 20 22 24 26 28 30
FIGURE 7. OUTPUT CURRENT vs VS VOLTAGE
FIGURE 6. OUTPUT CURRENT vs TEMPERATURE
500
1.5
+125°C
1.0
400
OUTPUT CURRENT (µA)
OUTPUT CURRENT ERROR (µA)
8
SUPPLY VOLTAGE (V)
TEMPERATURE (°C)
0.5
0.0
-0.5
+25°C
300
-55°C
200
100
-1.0
-1.5
-55
6
RL = 1kΩ
-35
-15
5
25
45
65
85
105
125
145
TEMPERATURE (°C)
FIGURE 8. TYPICAL ABSOLUTE ERROR WITHOUT EXTERNAL
CALIBRATION vs TEMPERATURE
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5
155
0.0
0
5
10
15
20
25
30
35
40
45
50
SUPPLY VOLTAGE (V)
FIGURE 9. VI CURVE OF VS vs IOUT OVER-TEMPERATURE
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ISL71590SEH
Typical Performance Curves Unless otherwise specified, VS = 5V, TA = +25°C. (Continued)
1000
CURRENT NOISE DENSITY (pA/√Hz)
VOLTAGE NOISE DENSITY (µV/√Hz)
1.0
0.1
0.01
0.1
1
10
100
1k
10k
100
10
0.1
100k
1
10
FIGURE 10. VOLTAGE NOISE DENSITY vs FREQUENCY
1k
10k
100k
FIGURE 11. CURRENT NOISE DENSITY vs FREQUENCY
0
70
-10
VS = 12V with 1.7VP_P RIPPLE
50mVP-P
60
-20
CAPACITANCE (pF)
-30
AC PSRR (dB)
100
FREQUENCY (Hz)
FREQUENCY (Hz)
-40
-50
-60
-70
-80
50
40
30
20
-90
-100
10
100
1k
100k
10k
FREQUENCY (Hz)
1M
10M
100M
10
1
FIGURE 12. AC PSRR vs FREQUENCY
10
100
FREQUENCY (Hz)
1k
10k
FIGURE 13. SHUNT CAPACITANCE vs FREQUENCY
Vs
+
T
VS
VOUT
~100Ω
950Ω
Adjust R to calibrate out error
for any single temperature point
VOUT = IOUT *R (1kΩ)
0V
FIGURE 14. SINGLE TEMPERATURE ERROR CALIBRATION
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FIGURE 15. TURN-ON/OFF VS VOLTAGE
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ISL71590SEH
Typical Performance Curves Unless otherwise specified, VS = 5V, TA = +25°C. (Continued)
Vs
Vs
VOUT = IOUT *R (1kΩ)
VOUT = IOUT *R (1kΩ)
0V
0V
FIGURE 16. VS RAMP = 3.7V/ms, IOUT TURN-ON
FIGURE 17. VS RAMP = 5V/µs, IOUT TURN-ON
0.60
Vs
VOUT = IOUT *R (1kΩ)
0V
OUTPUT CURRENT ERROR (µA)
0.40
0.20
0.00
-0.20
-0.40
-0.60
-0.80
-1.00
0
50k
100k
150k
200
50k
300k
TOTAL DOSE (krad(Si))
FIGURE 18. VS RAMP = 50V/µs, IOUT TURN-ON
Functional Description
Functional Overview
The ISL71590SEH is an integrated-circuit temperature-to-current
transducer, which produces an output current proportional to
absolute temperature. The device acts as a high impedance
constant current regulator passing 1µA/K for supply voltages
(V+ to V-) from +4V to +33V.
The ISL71590SEH is manufactured in Intersil’s PR40,
silicon-on-insulator process, which makes this device immune to
single event latch-up and provides excellent radiation tolerance.
This makes it the ideal choice for high reliability applications in
harsh radiation prone environments.
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FIGURE 19. TYPICAL ABSOLUTE IOUT ERROR vs TOTAL IONIZING
DOSE FOR HIGH DOSE RATE
The ISL71590SEH is specified over temperatures of -55°C to
+125°C without the need for additional circuitry to produce an
output within ±1.7°C accuracy. With power requirements as low
as 1.5mW (5V at +25°C), it is an ideal choice for remote sensing
as any length of a well-insulated twisted pair cable will allow for
proper operation. The high output impedance (>10MΩ) leaves
plenty of room for variations in the power supply voltage. It is
electrically durable since it can withstand a forward operating
voltage of 33V over the full temperature range with and without
ion beam radiation and a reverse voltage of -40V.
The ISL71590SEH should be used in any temperature sensing
application from -55°C to +150°C in which conventional
electrical temperature sensors are currently employed. The
ISL71590SEH provides a total temperature sensing solution that
is both low in complexity and small in size by eliminating the
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ISL71590SEH
support circuitry necessary with other thermal sensors such as
thermistors, thermocouples and other discrete based solutions.
External linearization circuitry, precision voltage amplifiers,
resistance measuring circuitry and cold junction compensation
are not needed when applying the ISL71590SEH.
Non-Linearity in referring to the ISL71590SEH, is the maximum
allowable deviation of the output current over-temperature for
any single part relative to its individual best fit line over 5 discrete
temperature (-55°C, -15°C, +25°C, +85°C, +125°C) points. This
performance is guaranteed by testing.
In the simplest application, the ISL71590SEH, a resistor, a power
source and any voltmeter can be used to measure temperature.
Ideally resistors used should be of a metal film or metal strip
type, such resistors having very low thermal coefficient values.
Repeatability Errors arise from a strain hysteresis of the
package. For the ISL71590SEH this is the maximum deviation
between +25°C readings after a single temperature excursion
between -55°C and +125°C, and is guaranteed by
characterization and is not tested. The magnitude of this error is
solely a function of the magnitude of the temperature span and
duration over which the device is exposed.
When voltage is initially applied to the ISL71590SEH, the circuit
becomes active at slightly less than 4V, (V+ to V-), with IOUT
ramping up typically 2µs after. There will be an initial short
period of time for the IOUT to be correctly proportional to the
ambient temperature. Depending on the VS ramp rate and
amplitude this may take a few µs before a reliable temperature
reading is available. See Figures 15 through 18 for scope shot
examples.
The output characteristics also makes the ISL71590SEH easy to
multiplex; with either or both the input supply voltage or the
output current can be switched by a CMOS multiplexer such as
the HS-508 or HS-1840 from Intersil.
When the ISL71590SEH die product is used, the die substrate
should be tied to the more negative of the 2 terminals for
optimum performance.
Parameter Glossary
The ISL71590SEH parametric specifications provide for an
understanding of the temperature sensor performance
over-temperature and radiation exposure. Following are critical
parameter explanations as they relate to usage and
interpretation.
Ambient Error Accuracy refers to the maximum error at an
ambient temperature of +25°C and is expressed as 0.5°C of
the Nominal Current Output at +25°C (298.15K) of 298.15µA.
The Absolute Error without External Calibration describes the
temperature accuracy over the entire -55°C to +125°C range. The
typical performance is shown in Figure 8 on page 5. Both of
these two first specification explanations are to be considered as
initial error accuracy specifications.
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 ISL71590SEH
temperatures at +125°C typically results in long-term drift of
0.05°C after 1khr with a specification of - 0.25°C to +0.25°C.
Trimming Out Errors
The ideal graph of current versus temperature for the
ISL71590SEH is a straight line, but as Figure 20 on page 9
shows, the actual shape is slightly different (exaggerated greatly
for explanation). Since the sensor is limited to the range of -55°C
to +150°C it is possible to optimize the accuracy by trimming.
Trimming extracts the maximum performance from the sensor.
The circuit in Figure 21 on page 9 trims the slope of the
ISL71590SEH output. The effect of this is shown in Figure 22 on
page 9.
The circuit of Figure 23 on page 9 trims both the slope and the
offset.
Starting in Figure 24 on page 9 with an untrimmed slope, then
progressing through to Figure 27 on page 10 each figure showing
the effect of adjusting the offset and slope and finally the offset
again to finally arrive at an optimized condition.
The diagrams curvatures are highly are exaggerated to show
effects, but it should be clear that these trims can be used to
minimize errors over a partial or the entire temperature range.
The Post Low Dose Rate Radiation Ambient Error (ERADD) is the
specified accuracy after 50krad(Si) at 0.01 rad(Si) per second
(LDR) and 300krad(Si) at 70 rad(Si) per second (HDR) exposure.
This radiation hardness performance is unmatched in the
industry for this class of device, this performance is shown in
Figure 2 on page 1 as a delta over radiation type and in Figure 19
on page 7 as an absolute measurement.
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ISL71590SEH
Trimming Out Errors
+Vs
IDEAL
+
T
IOUT (µA)
VOUT
ACTUAL
(GREATLY
EXAGGERATED)
~100Ω
950Ω
Adjust R to calibrate out error
for any single temp point
T (K)
FIGURE 20. TRIMMING OUT ERRORS
FIGURE 21. SLOPE TRIMMING
+10v
IDEAL
35.7kΩ
97.6kΩ
IOUT (µA)
R1 2kΩ
R2 5kΩ
+
R1 = OFFSET
+
R2 = SLOPE
T
ISL71590SEH
ACTUAL
TRIMMED
VOUT = 100mV/°C
-
VT (K)
FIGURE 23. SLOPE AND OFFSET TRIMMING
IOUT (µA)
IOUT (µA)
FIGURE 22. EFFECT OF SLOPE TRIM
T (K)
FIGURE 24. UNTRIMMED
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T (K)
FIGURE 25. TRIM ONE: OFFSET
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ISL71590SEH
IOUT (µA)
IOUT (µA)
Trimming Out Errors (Continued)
T (K)
T (K)
FIGURE 27. TRIM THREE: OFFSET AGAIN
FIGURE 26. TRIM TWO: SLOPE
Typical Applications
VS = +14V
The following section of the datasheet illustrates several
application ideas, touching on each with a short explanation.
There is an evaluation board ISL71590SEHEV1Z and
accompanying user guide “ISL71590SEH Evaluation Board
User’s Guide” that details 4 of the more fundamental
implementations of this device.
+5V
+
T
+
T
ISL71590SEH
-
Maximum number = (VSmin - VOUTmax)/4V
+
T
VOUT = 1mV/K
+
1kΩ
0.1%
T
-
ISL71590SEH
VOUT = 1mV/K
1kΩ
FIGURE 30. LOWEST TEMPERATURE SENSING SCHEME. OUTPUT
CURRENT IS THAT OF THE “ COLDEST” SENSOR
VS = +12V
FIGURE 28. TYPICAL APPLICATION
- 1
OUTPUT CURRENT (mA)
+
+
+
T
T
T
-
423.0
2
-
n
.
VOUT = (Io1+Io2 - +Ion) R
n
298.2
R
218.0
Where n = number of ISL71590SEH
e.g., with 4 sensors and R = 250Ω VOUT = 1mV/K)
FIGURE 31. AVERAGE TEMPERATURE SENSING SCHEME
218K
(-55°C)
298.2K
423K
(+25°C)
(+150°C)
The sum of the ISL71590SEH currents appears across R, which
represents the average temperature in the sensor array (see
Figure 31).
TEMPERATURE
FIGURE 29. SIMPLE CONNECTION. OUTPUT IS PROPORTIONAL TO
ABSOLUTE TEMPERATURE
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ISL71590SEH
HEATER
ELEMENT
+15V
ISL71590SEH
+
RT
0.1%
C
R2
R3
R4
R5
°F
9.00
4.02
2.0
12.4
10.0
0
°C
5.00
4.02
2.0
5.11
5.0
11.8
5
7
2
R1
R1
RB
IS139
3
-
R
4

1
R n = 28k nominal
n=1
NOTE: ALL values are in kΩ.
R2
VZERO
R3
ISL71090SEH12
1.25V
FIGURE 32. SINGLE SETPOINT TEMPERATURE CONTROLLER
In Figure 32, the ISL71590SEH produces a temperature
dependent voltage across RT (C is for filtering noise). Setting R2
produces a scale-zero voltage. For the celsius scale, make
RT = 1kΩ and VZERO = 0.273V. For Fahrenheit, RT = 1.8kΩ and
VZERO = 0.460V.
In Figure 34, the ICL7106 has a VIN span of ±2.0V and a VCM
range of (V+ - 0.5V) to (V- + 1V). R is scaled to bring each range
within VCM while not exceeding VIN . The VREF for both scales is
500mV, maximum reading on the celsius range is 150°C limited
by the maximum allowable sensor temperature. Maximum
reading on the fahrenheit range is 199.9°F (93.3°C) limited by
the number of display digits.
V+
7.5kΩ
500µA
ISL71590SEH
4V < VBATT < 30V
+
-
-
+
I
5kΩ
SCALE
ADJ
2.26kΩ
15kΩ
REF HI
REF LO
ICL7106
IN HI
+
-
COMMON
1.00kΩ
IN LO
+
T
ISL71590SEH
-
FIGURE 33. SIMPLEST THERMOMETER
Figure 33, illustrates the simplest thermometer displaying
current output directly in Kelvin. using the ISL71590SEH, sensor
output is within ±1.7K over the entire range.
V+
R1
R2
R
R3
R4
V-
FIGURE 35. BASIC DIGITAL THERMOMETER, KELVIN SCALE
Figure 35, illustrates the Kelvin scale version reading from 0 to
1999K theoretically, and from 223K to 473K actually. The
2.26kΩ resistor brings the input within the ICL7106 VCM range: 2
general-purpose silicon diodes or an LED may be substituted.
REF HI
REF LO
ICL7106
IN HI
R5
COMMON
IN LO
+
T
ISL71590SEH
V-
FIGURE 34. BASIC DIGITAL THERMOMETER, CELSIUS AND
FAHRENHEIT SCALES
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FN8376.2
ISL71590SEH
+
7.5kΩ
12kΩ
5kΩ
V+
ZERO
ADJ 5kΩ
1.000V
402Ω
T
SCALE
ADJ
REF HI
-
REF LO
15kΩ
26.1kΩ
1kΩ
ZERO SET
44.2kΩ
10mV/°C
+
-
ICL7106
ISL70417 (1/4)
10kΩ
0.1%
20kΩ
FULL-SCALE
ADJUST
100Ω
COMMON
10kΩ
2.7315V
IN LO
+
T
118kΩ
115kΩ
IN HI
1kΩ
0.1%
+15V
ISL71590SEH
ISL71090SEH12
1.25V
M +100mA
-
FIGURE 37. CENTIGRADE THERMOMETER (0°C TO +100°C)
ISL71590SEH
V-
FIGURE 36. BASIC DIGITAL THERMOMETER, KELVIN SCALE WITH
ZERO ADJUST
The circuit in Figure 36 allows “zero adjustment” as well as slope
adjustment. The ISL71090SEH12 brings the input within the
common-mode range, while the 5kΩ pots trim any offset at
218K (-55°C) and set the scale factor.
Since all 3 scales have narrow VlN spans, some optimization of
the ICL7106 components can be made to lower noise and
preserve CMR. Table 2 shows the suggested values. Similar
scaling can be used with the ICL7126 and ICL7136
(see Figures 34 through 36).
Figure 37, illustrates the low bias current of the ISL70417, which
allows the use of large value gain resistors, keeping meter
current error under 0.5%. Therefore saving the expense of an
extra meter driving amplifier.
Figure 38 shows a differential temperature sensing circuit
configuration. The 50kΩ pot trims offset 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.
+
T
NO. 1
TABLE 2.
VIN RANGE
(V)
RINT
(kΩ)
CAZ
(µF)
V+
K
0.223 to 0.473
220
0.47
V-
C
-0.25 to +1.0
220
0.1
F
-0.29 to +0.996
220
0.1
SCALE
FOR ALL:
CREF = 0.1µF
ClNT = 0.22µF
COSC =100pF
ROSC = 100kΩ
50kΩ
-
10kΩ
5MΩ
(8V MIN)
+
+
T
NO. 2
-
10kΩ
VOUT = (T2 - T1) x
(10mV/°C)
ISL70417 (1/4)
FIGURE 38. DIFFERENTIAL THERMOMETER
In Figure 39 the reference junction(s) should be in close thermal
contact with the ISL71590SEH case. V+ must be at least 4V,
while ISL71090SEH12 current should be set 1mA to 2mA.
Calibration does not require shorting or removal of the
thermocouple: set R1 for V2 = 10.98mV.
If very precise measurements are needed, adjust R2 to the exact
Seebeck coefficient for the thermocouple used (measured or
from table) note V1 and set R1 to buck out this voltage (i.e., set
V2 = V1).
For other thermocouple types, adjust values to the appropriate
Seebeck coefficient.
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ISL71590SEH
V+
+
1mA/ °K
T
-
R2 40.2Ω
-
TC = 40mV/°K
V1 = 10.98mV
SEEBECK
COEFFICIENT = 40mV/°K
TYPE k
+
V+
+
VOUT
1.25V
V2 = 10.98mV
R1 4521Ω
40.2Ω
ISL71090SEH12
4.7mF
FIGURE 39. COLD JUNCTION COMPENSATION FOR TYPE K THERMOCOUPLE
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ISL71590SEH
Package Characteristics
TOP METALLIZATION
Type: AlCu (99.5%/0.5%)
Thickness: 30kÅ
Weight of Packaged Device
0. 07Grams (Typical)
BACKSIDE FINISH
Lid Characteristics
Silicon
Finish: Gold
Potential: Floating
Case Isolation to Any Lead: 10 x 109 Ω (minimum)
ASSEMBLY RELATED INFORMATION
SUBSTRATE POTENTIAL
Tied to V- pin
Die Characteristics
ADDITIONAL INFORMATION
Die Dimensions
WORST CASE CURRENT DENSITY
1185µm x 1695µm (46.7 mils x 66.7 mils)
Thickness: 254µm ±25.4µm (10 mils ±1 mil)
<5 x 103A/cm2
Interface Materials
PROCESS
Dielectrically Isolated Bipolar SOI - PR40
GLASSIVATION
TRANSISTOR COUNT
Type: Nitrox
Thickness: 15kÅ
92
Metallization Mask Layout
V+ (1)
V- (2)
PAD NAME
PIN NUMBER
X
(µm)
Y
(µm)
X
(µm)
Y
(µm)
BOND WIRES
PER PAD
V+
1
0
0
110
110
1
V-
2
823
0
110
110
1
NOTES:
9. Origin of coordinates is the centroid of pad 1.
10. Bond wire size is 1.25 mil.
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ISL71590SEH
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest Revision.
DATE
REVISION
CHANGE
June 3, 2016
FN8376.2
Clarified minimum differential voltage throughout document. Replaced figures 5 and 6.
January 19, 2016
FN8376.1
Removed Pb-Free Reflow reference from “Thermal Information” on page 4 as it is not applicable to hermetic
packages.
In “Electrical Specifications” on page 4:
-Updated EA maximum and minimum limits.
-Updated ERADD Low Dose minimum limits.
-Updated ERADD High Dose minimum limits.
Updated About Intersil Section.
September 26, 2013
FN8376.0
Initial Release
About Intersil
Intersil Corporation is a leading provider of innovative power management and precision analog solutions. The company's products
address some of the largest markets within the industrial and infrastructure, mobile computing and high-end consumer markets.
For the most updated datasheet, application notes, related documentation and related parts, please see the respective product
information page found at www.intersil.com.
You may report errors or suggestions for improving this datasheet by visiting www.intersil.com/ask.
Reliability reports are also available from our website at www.intersil.com/support.
For additional products, see www.intersil.com/en/products.html
Intersil products are manufactured, assembled and tested utilizing ISO9001 quality systems as noted
in the quality certifications found at www.intersil.com/en/support/qualandreliability.html
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software 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.
For information regarding Intersil Corporation and its products, see www.intersil.com
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FN8376.2
ISL71590SEH
Package Outline Drawing
K2.A
2 LEAD CERAMIC METAL SEAL FLATPACK PACKAGE
Rev 1, 4/12
0.030 (0.762) REF
PIN NO. 1 ID OPTIONAL
POSITIVE LEAD INDICATOR (NO. 1)
0.019 (0.483)
0.050 (1.270) BSC
0.015 (0.381)
A
1
2
PIN NO. 1 ID AREA
0.093 (2.362)
0.081 (2.057)
A
0.240 (6.10)
0.500 (12.70) MIN
0.220 (5.59)
TOP VIEW
0.210 (5.33)
0.190 (4.83)
0.050 (1.270)
0.041 (1.041)
0.0065 (0.1651)
0.0045 (0.1143)
0.014 (0.356) REF
SIDE VIEW
0.0065 (0.1651)
0.0045 (0.1143)
LEAD FINISH
NOTES:
0.0095 (0.2413)
BASE
METAL
0.0045 (0.1143)
0.019 (0.48)
0.015 (0.38)
0.0015 (0.04)
MAX
0.022 (0.56)
0.015 (0.38)
3
SECTION A-A
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1. Index area: A notch or a pin one identification mark shall be located
adjacent to pin one and shall be located within the shaded area shown.
The manufacturer’s identification shall not be used as a pin one
identification mark. Alternately, a tab may be used to identify pin one.
2. If a pin one identification mark is used in addition to a tab, the limits
of the tab dimension do not apply.
3. The maximum limits of lead dimensions (section A-A) shall be
measured at the centroid of the finished lead surfaces, when solder
dip or tin plate lead finish is applied.
4. Dimensioning and tolerancing conform to ANSI Y14.5M-1982.
5. Dimensions: Inch (mm). Controlling dimension: Inch.
June 3, 2016
FN8376.2