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OP290
Precision, Low Power, Micropower Dual Op Amp
The OP290 is a high performance micropower dual op amp that operates from a single supply of
1.6 V to 36 V or form dual supplies of ±0.8 V to ±18 V. Input voltage range includes the negative rail
allowing the OP290 to accommodate input signals down to ground in single-supply operation. The
OP290’s output swing also includes ground when operating from a single supply, enabling “zero-in,
zero-out” operation.
Rochester Electronics
Manufactured Components
Rochester branded components are
manufactured using either die/wafers
purchased from the original suppliers
or Rochester wafers recreated from the
original IP. All recreations are done with
the approval of the OCM.
Parts are tested using original factory
test programs or Rochester developed
test solutions to guarantee product
meets or exceeds the OCM data sheet.
Quality Overview
•
•
•
•
ISO-9001
AS9120 certification
Qualified Manufacturers List (QML) MIL-PRF-38535
•
Class
Q Military
•
Class
V Space Level
Qualified Suppliers List of Distributors (QSLD)
•
Rochester
is a critical supplier to DLA and
meets all industry and DLA standards.
Rochester Electronics, LLC is committed to supplying
products that satisfy customer expectations for
quality and are equal to those originally supplied by
industry manufacturers.
The original manufacturer’s datasheet accompanying this document reflects the performance
and specifications of the Rochester manufactured version of this device. Rochester Electronics
guarantees the performance of its semiconductor products to the original OEM specifications.
‘Typical’ values are for reference purposes only. Certain minimum or maximum ratings may be
based on product characterization, design, simulation, or sample testing.
© 2014 Rochester Electronics, LLC. All Rights Reserved 01212014
To learn more, please visit www.rocelec.com
a
Precision, Low Power, Micropower
Dual Operational Amplifier
OP290
FEATURES
Single-/Dual-Supply Operation, 1.6 V to 36 V, ⴞ0.8 V to ⴞ18 V
True Single-Supply Operation; Input and Output Voltage
Ranges Include Ground
Low Supply Current (Per Amplifier), 20 ␮A Max
High Output Drive, 5 mA Min
Low Input Offset Voltage, 200 ␮V Max
High Open-Loop Gain, 700 V/mV Min
Outstanding PSRR, 5.6 ␮V/V Max
Industry Standard 8-Lead Dual Pinout
Available in Die Form
PIN CONNECTIONS
16-Lead SOL
(S-Suffix)
–IN A 1
16
+IN A 2
15 NC
+IN A
14 NC
NC 3
OP290
13 V+
TOP VIEW
NC 5 (Not to Scale) 12 NC
V– 4
GENERAL DESCRIPTION
+IN B 6
11 NC
The OP290 is a high performance micropower dual op amp that
operates from a single supply of 1.6 V to 36 V or from dual
supplies of ± 0.8 V to ± 18 V. Input voltage range includes the
negative rail allowing the OP290 to accommodate input signals
down to ground in single-supply operation. The OP290’s output swing also includes ground when operating from a single
supply, enabling “zero-in, zero-out” operation.
–IN B 7
10 OUT B
The OP290 draws less than 20 µA of quiescent supply current
per amplifier, while able to deliver over 5 mA of output current
to a load. Input offset voltage is below 200 µV eliminating the
need for external nulling. Gain exceeds 700,000 and common-mode
rejection is better than 100 dB. The power supply rejection ratio
of under 5.6 pV/V minimizes offset voltage changes experienced
in battery-powered systems. The low offset voltage and high gain
offered by the OP290 bring precision performance to micropower
applications. The minimal voltage and current requirements
of the OP290 suit it for battery- and solar-powered applications,
such as portable instruments, remote sensors, and satellites. For
a single op amp, see the OP90; for a quad, see the OP490.
NC 8
NC
9
NC = NO CONNECT
EPOXY MINI-DIP
(P-Suffix)
8-Lead HERMETIC DIP
(Z-Suffix)
OUT A
1
–IN A
2
+IN A
3
V–
4
A
B
OP290
8
V+
7
OUT B
6
–IN B
5
+IN B
V+
+IN
OUTPUT
–IN
NULL
NULL
V
ELECTRONICALLY ADJUSTED ON CHIP
FOR MINIMUM OFFSET VOLTAGE
Figure 1. Simplified Schematic (one of two amplifiers is shown)
REV. A
Information furnished by Analog Devices is believed to be accurate and
reliable. However, no responsibility is assumed by Analog Devices for its
use, nor for any infringements of patents or other rights of third parties that
may result from its use. No license is granted by implication or otherwise
under any patent or patent rights of Analog Devices.
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.
Tel: 781/329-4700
www.analog.com
Fax: 781/326-8703
© Analog Devices, Inc., 2002
OP290–SPECIFICATIONS
ELECTRICAL CHARACTERISTICS
(@ VS = ⴞ1.5 V to ⴞ15 V, TA = 25ⴗC, unless otherwise noted.)
OP290E
Parameter
Symbol
Conditions
Min
INPUT OFFSET VOLTAGE
VOS
OP290F
OP290G
Typ Max Min
Typ
Max Min
Typ
Max Unit
50
200
75
300
125
500
µV
INPUT OFFSET CURRENT
IOS
VCM = 0 V
0.1
3
0.1
5
0.1
5
nA
INPUT BIAS CURRENT
IB
VCM = 0 V
4.0
15
4.0
20
4.0
25
nA
LARGE-SIGNAL
VOLTAGE GAIN
AVO
INPUT VOLTAGE RANGE1
IVR
OUTPUT VOLTAGE SWING
VO
VOH
VOL
COMMON-MODE
REJECTION
CMR
POWER SUPPLY
REJECTION RATIO
PSRR
SUPPLY CURRENT
(All Amplifiers)
ISY
CAPACITIVE LOAD
STABILITY
INPUT NOISE VOLTAGE1
enp-p
INPUT RESISTANCE
DIFFERENTIAL-MODERIN
VS = ±15 V, VO = ±10 V
RL = 100 kΩ
RL = 10 kΩ
RL = 2 kΩ
V+ = 5V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kΩ
RL = 10 kΩ
700
350
125
1200
600
250
500
250
100
1000
500
200
400
200
100
600
400
200
200
100
400
180
125
75
300
140
100
70
250
140
V+ = 5 V, V– = 0 V
V S = ± 5 V1
0/4
–15/13.5
0/4
–15/13.5
0/4
–15/13.5
± 13.5± 14.2
± 10.5± 11.5
40
4.2
± 13.5± 14.2
± 10.5± 11.5
4.0
4.2
± 13.5 ± 14.2 V
± 10.5 ± 11.5
4.0
4.2
V
VS = ± 5 V
RL = 10 kΩ
RL = 2 kΩ
V+ = 5 V, V– = 0 V
V+ = 5 V, V– = 0 V
RL = 10kn
V
50
10
50
10
50
µV
ttS
80
100
80
100
dB
120
90
120
90
120
10
5.6
10
5.6
3.2
10
µV/V
VS = ± 1.5 V
VS = ± 15 V
19
25
30
40
19
25
30
40
19
25
30
40
µA
AV = +1
No Oscillations
650
650
650
PF
fO = 0.1 Hz to 10 Hz
VS = ± 15 V
3
3
3
µVp-p
VS = ±15 V
30
30
30
MΩ
20
20
20
GΩ
12
V/ms
20
kHz
150
dB
INPUT RESISTANCE
COMMON-MODE
RINCM
VS = ± 15 V
SLEW RATE
SR
AV = +1
VS = ± 15 V
GAIN BANDWIDTH
PRODUCT
GBWP
Vs = +15 V
VS = ± 15 V
CS
fO = 10 Hz
VO = 20 Vp-p
VS = ± 15 V2
CHANNEL
SEPARATION2
10
V+ = 5 V, V– = 0 V
0 V < VCM < 4 V
100
VS = ± 15 V,
–15 V < VCM < 13.5 V
V/mV
5
12
5
20
120
150
12
5
20
120
150
120
NOTES
1
Guaranteed by CMR test.
2
Guaranteed but not 100% tested.
Specifications subject to change without notice.
–2–
REV. A
OP290
ELECTRICAL CHARACTERISTICS
(@ VS = ⴞ1.5 V to ⴞ15 V, –55ⴗC ≤ TA ≤ 125ⴗC, unless otherwise noted.)
OP290A
Parameter
Symbol
INPUT OFFSET VOLTAGE
VOS
AVERAGE INPUT OFFSET
VOLTAGE DRIFT
TCVOS
INPUT OFFSET CURRENT
INPUT BIAS CURRENT
Typ
Max
Unit
80
500
µV
VS = 15 V
03
3
µV/°C
IOS
VCM = 0 V
0.1
5
nA
IB
VCM = 0 V
4.2
20
nA
AVO
VS = 15 V, VO = ± 10 V
RL = 100 kΩ
RL = 10 kΩ
RL = 2 kΩ
V+ = 5 V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kΩ
RL = 10 kΩ
LARGE-SIGNAL
VOLTAGE GAIN
Conditions
Min
INPUT VOLTAGE RANGE*
IVR
V+ = 5 V, V– = 0 V
VS = ± 15 V*
OUTPUT VOLTAGE SWING
VO
VS = ± 15 V
RL = 10 kΩ
RL = 2 kΩ
V+ = 5 V, V– = 0 V
RL = 2 kΩ
V+ = 5 V, V– = 0 V
RL = 10 kΩ
VOH
VOL
COMMON-MODE REJECTION
CMR
POWER SUPPLY
REJECTION RATIO
PSRR
SUPPLY CURRENT
(All Amplifiers)
IsY
V+ = 5 V, V– = 0 V, 0 V < VCM < 13.5 V
VS = ± 15 V, –15 V < VCM < 13.5 V
VS = ± 1.5 V
VS = ± 15 V
NOTES
*Guaranteed by CMR test.
Specifications subject to change without notice.
REV. A
–3–
225
125
50
400
240
110
V/mV
100
50
200
110
0/3.5
–15/13.5
V
± 13
± 10
V
± 14.1
± 11
10
80
90
100
105
115
V
µV
dB
3.2
10
µV/V
30
38
50
60
µA
OP290
ELECTRICAL CHARACTERISTICS
(@ VS = ⴞ1.5 V to ⴞ15 V, –40ⴞⴗC ≤ TA ≤ 85ⴗC for OP290E/OP290F/OP290G, unless
otherwise noted.)
OP290E
Parameter
Symbol Conditions
Min
OP290F
Typ Max
INPUT OFFSET VOLTAGE
VOS
Min
OP290G
Typ Max
Min
Typ Max Unit
70
400
115 600
200 750 µV
0.3
3
0.6
5
1.2
INPUT OFFSET CURRENT
IOS
VCM = 0 V
01
3
0.1
5
0.1
7
nA
INPUT BIAS CURRENT
IB
4.2
t5
4.2
20
4.2
25
nA
AVERAGE INPUT OFFSET
VOLTAGE DRIFT
TCVOS
LARGE-SIGNAL
VOLTAGE GAIN
AVO
VS = ± 15 V
VCM = 0 V
VS = ±5 V, VO = ±0 V
RL = 100 kΩ
RL = 10 kΩ
RL = 2 kΩ
V+ = 5 V, V– = 0 V,
1 V < VO < 4 V
RL = 100 kΩ
RL = 10 kΩ
INPUT VOLTAGE RANGE*
IVR
V+ = 5 V, V– = 0 V
VS = +15 V*
OUTPUT VOLTAGE SWING
VO
VS = ± 15 V
RL = 10 kΩ
RL = 2 kΩ
VOH
V+ = 5 V, V– = 0 V
RL = 2 kΩ
V+ = 5 V, V– = 0 V
VOL
RL = 10 kΩ
COMMON-MODE
REJECTION
CMR
V+ = 5 V, V– = 0 V,
0 V < VCM < 3.5 V
VS = ± 15 V
–15 V < VCM < 13.5 V
POWER SUPPLY
PSRR
REJECTION RATIO
SUPPLY CURRENT ISY
(All Amplifiers)
VS = ± 1.5 V
VS = ± 15 V
µV/°C
V/mV
500
250
100
800
400
200
350
175
75
700
350
150
300
150
75
600
250
125
150
75
280
140
100
50
220
110
80
40
160
90
0/3.5
–15/13.5
0/3.5
–15/13.5
0/3.5
–15/13.5
V
± 13
± 10
± 14
± 11
± 13
± 10
± 14
± 11
± 13
± 10
± 14
± 11
V
3.9
4.1
3.9
4.1
3.9
4.1
V
10
100
10
100
10
85
105
80
100
80
100
95
115
90
110
90
110
100 µV
dB
3.2
7.5
5.6
10
5.6
15
µV/V
24
31
50
60
24
31
50
60
24
31
50
60
µA
NOTE
*Guaranteed by CMR test.
Specifications subject to change without notice.
–4–
REV. A
OP290
ABSOLUTE MAXIMUM RATINGS 1
ORDERING GUIDE
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ± 18 V
Differential Input Voltage . . . [(V–) – 20 V] to [(V+) + 20 V]
Common-Mode Input Voltage . [(V–) – 20 V] to [(V+) + 20 V]
Output Short-Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range
P, S, Z Packages . . . . . . . . . . . . . . . . . . . . . –65°C to +150°C
Operating Temperature Range
OP290A . . . . . . . . . . . . . . . . . . . . . . . . . . . . –55°C to +125°C
OP290E, OP290F, OP290G . . . . . . . . . . . . . –40°C to +85°C
Junction Temperature (Tj) . . . . . . . . . . . . . –65°C to +150°C
Lead Temperature Range (Soldering, 60 sec) . . . . . . . 300°C
Package Type
␪jA2
␪jC
Unit
8-Lead Hermetic DIP (Z)
8-Lead Plastic DIP (P)
16-Lead SOL (S)
134
96
92
12
37
27
°C/W
°C/W
°C/W
NOTES
1
Absolute Maximum Ratings apply to both DICE and packaged parts, unless
otherwise noted.
2
␪jA is specified for worst-case mounting conditions, i.e., ␪jA is specified for
device in socket for CERDIP and P-DIP packages; ␪jA is specified for device
soldered to printed circuit board for SOL package.
TA = 25ⴗC
VOS Max
(mV)
200
200
300
500
500
Package
Cerdip
8-Lead
Plastic
OP290AZ*
OP290EZ*
OP290FZ*
OP290GP
OP290GS*
MIL
XIND
XIND
XIND
XIND
*Not for new designs. Obsolete April 2002.
For military processed devices, please refer to the Standard
Microcircuit Drawing (SMD) available at
www.dscc.dla.mil/programs.milspec./default.asp
SMD Part Number
ADI Part Number
5962-89783012A*
5962-8978301PA*
OP290ARCMDA
OP290AZMDA
*Not for new designs. Obsolete April 2002.
CAUTION
ESD (electrostatic discharge) sensitive device. Electrostatic charges as high as 4000 V readily
accumulate on the human body and test equipment and can discharge without detection. Although
the OP290 features proprietary ESD protection circuitry, permanent damage may occur on devices
subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are
recommended to avoid performance degradation or loss of functionality.
REV. A
Operating
Temperature
Range
–5–
WARNING!
ESD SENSITIVE DEVICE
OP290
60
40
20
4.4
INPUT BIAS CURRENT – nA
80
4.5
VS = 15V
0.14
0.12
0.1
0.08
0.06
0
0
25 50 75
–75 –50 –25
TEMPERATURE – C
VS = 15V
20
16
VS = 1.5V
12
TA = 85 C
400
300
TA = 125 C
200
GAIN
60
40
20
0
5
10
15
20
TEMPERATURE – C
25
0
30
20
0
5
OUTPUT VOLTAGE SWING – V
OUTPUT VOLTAGE SWING – V
40
100
1k
10k
FREQUENCY – Hz
100k
4
3
2
1
TPC 7. Closed-Loop Gain vs.
Frequency
0
100
1k
10k
LOAD RESISTANCE – ⍀
100k
TPC 8. Ouput Voltage Swing vs.
Load Resistance
–6–
10
15
20
FREQUENCY – Hz
25
30
14
12
10
8
6
4
2
–20
10
5
16
TA = 25 C
V+ = 5V, V– = 0V
TA = 25 C
Vs = 15V
0
TPC 6. Open-Loop Gain and Phase
Shift vs. Frequency
6
60
CLOSED-LOOP GAIN – dB
0
TPC 5. Open-Loop Gain vs.
Single-Supply Voltage
TPC 4. Supply Current vs.
Temperature
TA = 25 C
Vs = 15V
RL = 100k⍀
80
8
100 125
100 125
100
100
4
0
25
50
75
–75 –50 –25
TEMPERATURE – C
3.7
120
OPEN-LOOP GAIN – dB
OPEN-LOOP GAIN – V/mV
SUPPLY CURRENT – ␮A
32
28
3.9
3.8
140
TA = 25 C
500
36
4.0
TPC 3. Input Bias Current vs.
Temperature
RL = 10k⍀
NO LOAD
40
24
100 125
600
44
4.1
3.5
–75 –50 –25
0
25
50
75
TEMPERATURE – C
TPC 2. Input Offset Current vs.
Temperature
TPC 1. Input Offset Voltage vs.
Temperature
4.3
4.2
3.6
–75 –50 –25
0
25 50 75
TEMPERATURE – C
100 125
VS = 15V
PHASE SHIFT – Degrees
VS = 15V
INPUT OFFSET CURRENT – nA
INPUT OFFSET VOLTAGE – ␮V
100
0
100
TA = 25 C
Vs = 15V
1k
10k
LOAD RESISTANCE – ⍀
100k
TPC 9. Output Voltage Swing
vs. Load Resistance
REV. A
Typical Performance Characteristics–OP290
NEGATIVE SUPPLY
120
100
POSITIVE SUPPLY
80
60
120
100
60
40
1
10
100
FREQUENCY – Hz
1
1k
TPC 10. Power Supply Rejection
vs. Frequency
CURRENT NOISE DESTINY– nV/ Hz
1,000
10
100
FREQUENCY – Hz
10
0.1
1k
TPC 11. Common-Mode Rejection
vs. Frequency
100
100
90
90
10
100
FREQUENCY – Hz
1k
TA = 25 C
VS = 15V
AV = +1
RL = 10k⍀
CL = 500pF
TA = 25 C
VS = 15V
AV = +1
RL = 10k⍀
CL = 500pF
1
10
10
0%
0%
20mV
1
10
100
FREQUENCY – Hz
TPC 13. Current Noise Density
vs. Frequency
REV. A
1
TPC 12. Noise Voltage Density
vs. Frequency
TA = 25 C
VS = 15V
0.1
0.1
TA = 25 C
VS = 15V
100
80
40
10
TA = 25 C
VS = 15V
NOISE VOLTAGE DESTINY– nV/ Hz
140
TA = 25 C
COMMON MODE REJECTION – dB
POWER SUPPLY REJECTION – dB
140
100␮s
5V
1ms
1k
TPC 14. Small-Signal Transient
Response
–7–
TPC 15. Large-Signal Transient
Response
OP290
+18V
+15V
+15V
8
100k⍀
1/2
2
200⍀
3
1/2
OP290
OP290
1
A
1k⍀
V2
OP37A
9k⍀
6
1/2
5
OP290
10k⍀
100⍀
7
–15V
100k⍀
–15V
VIN
4
1/2
OP290
V1 20Vp-p @ 10Hz
B
V1
CHANNEL SEPARATION = 20 LOG V2/1000
–18V
Figure 3. Channel Separation Test Circuit
Figure 2. Burn-In Circuit
APPLICATIONS INFORMATION
BATTERY-POWERED APPLICATIONS
APPLICATIONS
TEMPERATURE TO 4–20 mA TRANSMITTER
The OP290 can be operated on a minimum supply voltage of
1.6 V, or with dual supplies of 0.8 V, and draws only 19 pA of
supply current. In many battery-powered circuits, the OP290
can be continuously operated for thousands of hours before
requiring battery replacement, reducing equipment downtime
and operating cost.
A simple temperature to 4–20 mA transmitter is shown in Figure 5.
After calibration, the transmitter is accurate to +0.5°C over the
–50°C to +150°C temperature range. The transmitter operates
from 8 V to 40 V with supply rejection better than 3 ppm/V.
One half of the OP290 is used to buffer the VTEMP pins while
the other half regulates the output current to satisfy the current
summation at its noninverting input.
High-performance portable equipment and instruments frequently use lithium cells because of their long shelf-life, light
weight, and high energy density relative to older primary cells.
Most lithium cells have a nominal output voltage of 3 V and are
noted for a flat discharge characteristic. The low supply voltage
requirement of the OP290, combined with the flat discharge
characteristic of the lithium cell, indicates that the OP290 can
be operated over the entire useful life of the cell. Figure 1 shows
the typical discharge characteristic of a 1 Ah lithium cell powering an OP290 with each amplifier, in turn, driving full output
swing into a 100 kΩ load.
IOUT =
VTEMP ( R6 + R7)
 R2 R6 R7 
– VSET 

R2 R10
 R2 R10 
LITHIUM SULPHUR DIOXIDE
CELL VOLTAGE – V
100
INPUT VOLTAGE PROTECTION
The OP290 uses a PNP input stage with protection resistors in
series with the inverting and noninverting inputs. The high
breakdown of the PNP transistors coupled with the protection
resistors provide a large amount of input protection, allowing
the inputs to be taken 20 V beyond either supply without damaging the amplifier.
80
60
40
20
0
SINGLE-SUPPLY OUTPUT VOLTAGE RANGE
In single-supply operation the OP290’s input and output ranges
include ground. This allows true “zero-in, zero-out” operation.
The output stage provides an active pull-down to around 0.8 V
above ground. Below this level, a load resistance of up to 1 MS2
to ground is required to pull the output down to zero.
0
500
1000
1500
2000
HOURS
2500
3000
3500
Figure 4. Lithium Sulphur Dioxide Cell Discharge
Characteristic with OP290 and 100 k⍀ Loads
The change in output current with temperature is the derivative
of the transfer function:
In the region from ground to 0.8 V, the OP290 has voltage gain
equal to the data sheet specification. Output current source capability is maintained over the entire voltage range including ground.
∆IOUT
=
∆T
–8–
∆VTEMP
(R6 + R7)
∆T
R2 R10
REV. A
OP290
VARIABLE SLEW RATE FILTER
From the formulas, it can be seen that if the span trim is adjusted
before the zero trim, the two trims are not interactive, which
greatly simplifies the calibration procedure.
The circuit shown in Figure 6 can be used to remove pulse noise
from an input signal without limiting the response rate to a genuine signal. The nonlinear filter has use in applications where
the input signal of interest is known to have physical limitations.
An example of this is a transducer output where a change of
temperature or pressure cannot exceed a certain rate due to
physical limitations of the environment. The filter consists of a
comparator which drives an integrator. The comparator compares the input voltage to the output voltage and forces the
integrator output to equal the input voltage. A1 acts as a comparator with its output high or low. Diodes D1 and D2 clamp
the voltage across R3 forcing a constant current to flow in or
out of C2. R3, C2, and A2 form an integrator with A2’s output
slewing at a maximum rate of:
Calibration of the transmitter is simple. First, the slope of the
output current versus temperature is calibrated by adjusting the
span trim, R7. A couple of iterations may be required to be sure
the slope is correct.
Once the span trim has been completed, the zero trim can be made.
Remember that adjusting the offset trim will not affect the gain.
The offset trim can be set at any known temperature by adjusting
R5 until the output current equals:


∆I FS
IOUT = 
– TMIN ) + 4 mA
 (T
 ∆TOPERATING  AMBIENT
0.6 V
VD
≈
R3 C 2 R3 C 2
For an input voltage slewing at a rate under this maximum slew
rate, the output simply follows the input with A1 operating in its
linear region.
Maximum slew rate =
Table I shows the values of R6 required for various temperature ranges.
Table I.
Temperature Range
R6 (k⍀)
0°C to +70°C
–40°C to +85°C
–55°C to +150°C
10
6.2
3
1N4002
V+
8V TO 40V
SPAN TRIM
VIN
REF-43BZ
VOUT
VTEMP
GND
2
1/2
3 R1
4
R4
20k⍀
2
6
10k⍀
R6
8
OP290EZ
1
VTEMP
R2
3k⍀
5
1k⍀
1/2
4
R5
5k⍀
R3
100k⍀
R7
5k⍀
VSET 6
ZERO
TRIM
OP290EZ
7
R8
1k⍀
2N1711
R9
100k⍀
R10
100⍀
1%, 1/2W
IOUT
RLOAD
Figure 5. Temperature to 4-20 mA Transmitter
REV. A
–9–
OP290
The 200 Ω variable resistor is used to trim the output voltage.
For the lowest temperature drift, parallel resistors can be used in
place of the variable resistor and taken out of the circuit as required
to adjust the output voltage.
+15V
R1
8
2
250k⍀
C1
0.1␮F
1/2
OP290GP
1
3
R2
100k⍀
V+
2
VIN
R3
1M⍀
REF-43FZ
C1
R4
D1
D2
25k⍀
5
6
OP290GP
8
2
1/2
GND
4700pF
OP290GP
7
1
2N2907A
3
4
1/2
6
VOUT
4
VOUT
VOUT
R2
4
R1A
2.37⍀
1%
–15V
R1B
200⍀
20-TURN
BOURNS 3006P-1-201
DIODES ARE 1N4148
Figure 6. Variable Slew Rate Filter
LOW OVERHEAD VOLTAGE REFERENCE
Figure 7 shows a voltage reference that requires only 0.1 V of
overhead voltage. As shown, the reference provides a stable
4.5 V output with a 4.6 V to 36 V supply. Output voltage drift is
only 12 ppm/°C. Line regulation of the reference is under 5 HV/V
with load regulation better than 10 µV/mA with up to 50 mA of
output current.
2k⍀
1%
C1
10␮F
C2
0.1␮F
Figure 7. Low Overhead Voltage Reference
The REF-43 provides a stable 2.5 V which is multiplied by the
OP290. The PNP output transistor enables the output voltage
to approach the supply voltage.
Resistors R1 and R2 determine the output voltage.
 R2 
VOUT = 2.5 V 1 +


R1 
–10–
REV. A
OP290
Revision History
Location
Page
Data Sheet changed from REV. 0 to REV. A.
Edits to ORDERING INFORMATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to PIN CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Edits to ABSOLUTE MAXIMUM RATINGS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Edits to PACKAGE TYPE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
Edits to WAFER TEST LIMITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Edits to DICE CHARACTERISTICS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
REV. A
–11–
–12–
PRINTED IN U.S.A.
C00327–0–1/02(A)