V
EXCITATION
(1)
Common (2)
V
OUTPUT
(3)
+
V
OFFSET
(4)
Ratiometric 4-Volt Output
High Accuracy Compensation
Full Scale Pressure Ranges
0 to 1 in. H
2
O to 0 to 30 in. H
2
O
0 to
1 in. H
2
O to
0 to
30 in. H
2
O
DESCRIPTION
The SURSENSETM line of ultra low pressure sensors is based
upon a proprietary, patent applied for technology designed
to reduce all output offset or common mode errors.
These sensors utilize a silicon, micromachined sensing element
which features a unique stress concentration enhanced
structure to provide a highly stable linear output that is
proportional to applied pressure. Output offset errors due to
changes in temperature, warm-up, long term stability and
position sensitivity have all been significantly reduced when
compared to conventional sensors.
The DCAL series sensors provide a precision calibrated
ratiometric 4 -volt output with SURSENSE enhanced stability.
Each sensor features the precision calibration found in the
DCX series with the addition of fully integrated signal
conditioning in an industry standard package. Intended to
operate from a fixed 5Vdc supply, the DCAL4 gage pressure
sensors provide a 0.25v to 4.25v output while the differential
versions provide a
2.0 volt output centered on a 2.25 volt
zero pressure offset. These highly stable sensors are ideally
suited for microprocessor or microcontroller based systems.
SURSENSE
TM
Ultra Low Pressure Sensors
OCTOBER 1997
DCAL4 Series
EQUIVALENT CIRCUIT
APPLICATIONS
s Medical Instrumentation
s HVAC
s Environmental Controls
s Portable Monitors
FEATURES
s Available in Gage and Differential
Pressure Ranges
s Temperature Compensated over 0
C to 50
C
s Position Sensitivity to
5mV/g
s Warm-up drift <
5mV
s Long Term Stability <
10mV
s Combined Linearity and Hysteresis Error
<
0.25%FS
s Custom Calibration Available
PINOUT
1
V
EXCITATION
2
Common
3
V
OUTPUT
4
V
OFFSET
DCAL Series
SURSENSE
TM
Ultra Low Pressure Sensors
MAXIMUM RATINGS
PARAMETER
MINIMUM
MAXIMUM
UNITS
Operating Temperature Range
25
85
C
Storage Temperature
40
125
C
Proof Pressure
100
in. H
2
O
Burst Pressure
200
in. H
2
O
Supply Current
Output Source Current
Output Sink Current
Excitation Voltage
3
16
V
Common Mode Pressure
50
psig
ELECTRICAL SPECIFICATIONS
PARAMETER,
note 1
MINIMUM
NORMAL
MAXIMUM
UNITS
Operating Pressure Range, gage pressure
1.0
in. H
2
O
Output Span, note 2
3.9
4.0
4.1
V
Offset Voltage
0.15
0.25
0.35
V
Temperature Effect on Offset (0
C50
C), note 3
60
mV
Combined Temperature Effect on Span (0
C50
C),
2
%Span
note 3
Offset Warm-up Shift, note 4
20
mV
Offset Position Sensitivity (
1g)
10
mV
Offset Long Term Drift (one year)
10
mV
Combined Linearity and Hysteresis Error, note 5
0.05
0.25
%FS
Note 1: Reference conditions (unless otherwise noted): Supply Voltage, V
S
= 5V
DC
, TA = 25
C, Common Mode Line Pressure = 0 psig.
Pressure measurements are with pressure applied to Port B.
Note 2: The voltage added to the offset voltage at full scale pressure. Nominally the output voltage range is 0.25 to 4.25 volts.
Note 3: Shift is relative to 25
C.
Note 4: Shift is within the first hour of excitation applied to the device.
Note 5: Measured at one-half full scale rated pressure using best straight line curve fit.
Ratiometric 4-Volt Output
High Accuracy Compensation
1 in. H
2
O Full Scale Pressure
DCAL401GN
DCAL Series
SURSENSE
TM
Ultra Low Pressure Sensors
Ratiometric 4-Volt Output
High Accuracy Compensation
1 in. H
2
O Full Scale Pressure
DCAL401DN
MAXIMUM RATINGS
PARAMETER
MINIMUM
MAXIMUM
UNITS
Operating Temperature Range
25
85
C
Storage Temperature
40
125
C
Proof Pressure
100
in H
2
O
Burst Pressure
200
in H
2
O
Supply Current
Output Source Current
Output Sink Current
Excitation Voltage
3
16
V
Common Mode Pressure
50
psig
ELECTRICAL SPECIFICATIONS
PARAMETER,
note 1
MINIMUM
NORMAL
MAXIMUM
UNITS
Operating Range, differential pressure
1.0
in. H
2
O
Output Span, note 2
1.90
2.0
2.10
V
Offset Voltage @ zero differential pressure
2.15
2.25
2.35
V
Temperature Effect on Offset (0
C50
C), note 3
40
mV
Combined Temperature Effect on Span (0
C50
C),
2
%Span
note 3
Offset Warm-up Shift, note 4
20
mV
Offset Position Sensitivity (
1g)
10
mV
Offset Long Term Drift (one year)
10
mV
Combined Linearity and Hysteresis Error, note 5
0.05
0.25
%FS
Note 1: Reference conditions (unless otherwise noted): Supply Voltage, V
S
= 5V
DC
, TA = 25
C, Common Mode Line Pressure = 0 psig.
Pressure measurements are with pressure applied to Port B.
Note 2: The voltage added to the offset voltage at full scale pressure. Nominally the output voltage range is 0.25 to 4.25 volts.
Note 3: Shift is relative to 25
C.
Note 4: Shift is within the first hour of excitation applied to the device.
Note 5: Measured at one-half full scale rated pressure using best straight line curve fit.
DCAL Series
SURSENSE
TM
Ultra Low Pressure Sensors
Ratiometric 4-Volt Output
High Accuracy Compensation
5 in. H
2
O Full Scale Pressure
DCAL405GN
MAXIMUM RATINGS
PARAMETER
MINIMUM
MAXIMUM
UNITS
Operating Temperature Range
25
85
C
Storage Temperature
40
125
C
Proof Pressure
150
in. H
2
O
Burst Pressure
300
in. H
2
O
Output Source Current
Output Sink Current
Excitation Voltage
3
16
V
Common Mode Pressure
50
psig
ELECTRICAL SPECIFICATIONS
PARAMETER,
note 1
MINIMUM
NORMAL
MAXIMUM
UNITS
Operating Pressure Range, gage pressure
5.0
in. H
2
O
Output Span, note 2
3.9
4.0
4.1
V
Offset Voltage
0.15
0.25
0.35
V
Temperature Effect on Offset (0
C50
C), note 3
10
40
mV
Combined Temperature Effect on Span (0
C50
C),
1
%Span
note 3
Offset Warm-up Shift, note 4
5
mV
Offset Position Sensitivity (
1g)
5
mV
Offset Long Term Drift (one year)
10
mV
Combined Linearity and Hysteresis Error, note 5
0.05
0.25
%FS
Note 1: Reference conditions (unless otherwise noted): Supply Voltage, V
S
= 5V
DC
, TA = 25
C, Common Mode Line Pressure = 0 psig.
Pressure measurements are with pressure applied to Port B.
Note 2: The voltage added to the offset voltage at full scale pressure. Nominally the output voltage range is 0.25 to 4.25 volts.
Note 3: Shift is relative to 25
C.
Note 4: Shift is within the first hour of excitation applied to the device.
Note 5: Measured at one-half full scale rated pressure using best straight line curve fit.
DCAL Series
SURSENSE
TM
Ultra Low Pressure Sensors
Ratiometric 4-Volt Output
High Accuracy Compensation
5 in. H
2
O Full Scale Pressure
DCAL405DN
MAXIMUM RATINGS
PARAMETER
MINIMUM
MAXIMUM
UNITS
Operating Temperature Range
25
85
C
Storage Temperature
40
125
C
Proof Pressure
150
in. H
2
O
Burst Pressure
300
in. H
2
O
Output Source Current
Output Sink Current
Excitation Voltage
3
16
V
Common Mode Pressure
50
psig
ELECTRICAL SPECIFICATIONS
PARAMETER,
note 1
MINIMUM
NORMAL
MAXIMUM
UNITS
Operating Range, differential pressure
5.0
in. H
2
O
Output Span, note 2
1.90
2.0
2.10
V
Offset Voltage
2.15
2.25
2.35
V
Temperature Effect on Offset (0
C50
C), note 3
+1
20
mV
Combined Temperature Effect on Span (0
C50
C),
1
%Span
note 3
Offset Warm-up shift, note 4
5
mV
Offset Position Sensitivity (
1g)
5
mV
Offset Long Term Drift (one year)
10
mV
Combined Linearity and Hysteresis Error, note 5
0.05
0.25
%FS
Note 1: Reference conditions (unless otherwise noted): Supply Voltage, V
S
= 5V
DC
, TA = 25
C, Common Mode Line Pressure = 0 psig.
Pressure measurements are with pressure applied to Port B.
Note 2: The voltage added to the offset voltage at full scale pressure. Nominally the output voltage range is 0.25 to 4.25 volts.
Note 3: Shift is relative to 25
C.
Note 4: Shift is within the first hour of excitation applied to the device.
Note 5: Measured at one-half full scale rated pressure using best straight line curve fit.
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