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OPA333, OPA2333
SBOS351E – MARCH 2006 – REVISED DECEMBER 2015
OPAx333 1.8-V, microPower, CMOS Operational Amplifiers, Zero-Drift Series
1 Features
•
•
•
•
•
•
•
•
1
3 Description
Low Offset Voltage: 10 μV (Maximum)
Zero Drift: 0.05 μV/°C (Maximum)
0.01-Hz to 10-Hz Noise: 1.1 μVPP
Quiescent Current: 17 μA
Single-Supply Operation
Supply Voltage: 1.8 V to 5.5 V
Rail-to-Rail Input/Output
microSize Packages: SC70 and SOT23
2 Applications
•
•
•
•
•
•
Transducers
Temperature Measurements
Electronic Scales
Medical Instrumentation
Battery-Powered Instruments
Handheld Test Equipment
The OPAx333 series of CMOS operational amplifiers
use a proprietary auto-calibration technique to
simultaneously provide very low offset voltage
(10 μV, maximum) and near-zero drift over time and
temperature. These miniature, high-precision, low
quiescent current amplifiers offer high-impedance
inputs that have a common-mode range 100 mV
beyond the rails, and rail-to-rail output that swings
within 50 mV of the rails. Single or dual supplies as
low as 1.8 V (±0.9 V) and up to 5.5 V (±2.75 V) can
be used. These devices are optimized for lowvoltage, single-supply operation.
The OPAx333 family offers excellent CMRR without
the
crossover
associated
with
traditional
complementary input stages. This design results in
superior performance for driving analog-to-digital
converters (ADCs) without degradation of differential
linearity.
The OPA333 (single version) is available in the 5-pin
SOT-23, SOT, and 8-pin SOIC packages, while the
OPA2333 (dual version) is available in the 8-pin
VSON, SOIC, and VSSOP packages. All versions are
specified for operation from –40°C to 125°C.
Device Information(1)
PART NUMBER
PACKAGE
OPA333
OPA2333
BODY SIZE (NOM)
SOT-23 (5)
2.90 mm × 1.60 mm
SOT (5)
2.00 mm x 1.25 mm
SOIC (8)
4.90 mm × 3.90 mm
VSON (8)
3.00 mm × 3.00 mm
SOIC (8)
4.90 mm × 3.90 mm
VSSOP (8)
3.00 mm × 3.00 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
0.1-Hz to 10-Hz Noise
OPAx333 Pinout Diagrams
500 nV/div
OPA333
OUT
1
V-
2
+IN
3
OPA333
5
4
V+
-IN
+IN
1
V-
2
-IN
3
SOT23-5
5
V+
4
OUT
SC70-5
OPA2333
1 s/div
OUT A
1
-IN A
2
+IN A
3
V-
4
Exposed
Thermal
Die Pad
on
Underside
8
V+
7
OUT B
6
-IN B
5
+IN B
DFN-8 (SON-8)
1
An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,
intellectual property matters and other important disclaimers. PRODUCTION DATA.
OPA333, OPA2333
SBOS351E – MARCH 2006 – REVISED DECEMBER 2015
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
1
1
1
2
3
5
6.1
6.2
6.3
6.4
6.5
6.6
6.7
5
5
5
6
6
7
8
Absolute Maximum Ratings ......................................
ESD Ratings..............................................................
Recommended Operating Conditions.......................
Thermal Information: OPA333 ..................................
Thermal Information: OPA2333 ................................
Electrical Characteristics...........................................
Typical Characteristics ..............................................
Detailed Description ............................................ 12
7.1
7.2
7.3
7.4
Overview .................................................................
Functional Block Diagram .......................................
Feature Description.................................................
Device Functional Modes........................................
12
12
12
14
8
Application and Implementation ........................ 15
8.1 Application Information............................................ 15
8.2 Typical Applications ............................................... 15
8.3 System Examples ................................................... 20
9 Power Supply Recommendations...................... 22
10 Layout................................................................... 23
10.1 Layout Guidelines ................................................. 23
10.2 Layout Example .................................................... 23
11 Device and Documentation Support ................. 24
11.1
11.2
11.3
11.4
11.5
11.6
11.7
Device Support......................................................
Documentation Support ........................................
Related Links ........................................................
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
24
24
24
24
24
24
25
12 Mechanical, Packaging, and Orderable
Information ........................................................... 25
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (November 2013) to Revision E
•
Page
Added Pin Configuration and Functions section, ESD Ratings and Thermal Information tables, Feature Description
section, Device Functional Modes, Application and Implementation section, Power Supply Recommendations
section, Layout section, Device and Documentation Support section, and Mechanical, Packaging, and Orderable
Information section ................................................................................................................................................................ 1
Changes from Revision C (May 2007) to Revision D
Page
•
Changed data sheet format to most current standard look and feel ...................................................................................... 1
•
Added OPA2333 DFN-8 pinout to front page......................................................................................................................... 1
•
Changed 2nd signal input terminals parameter in the Absolute Maximum Ratings from "voltage" to "current" (typo) .......... 5
•
Added Table 1 ........................................................................................................................................................................ 8
2
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SBOS351E – MARCH 2006 – REVISED DECEMBER 2015
5 Pin Configuration and Functions
OPA333 DBV Package
5-Pin SOT
Top View
OUT
1
V-
2
+IN
3
5
4
OPA333 DCK Package
5-Pin SC70
Top View
V+
+IN
1
V-
2
-IN
3
-IN
5
V+
4
OUT
OPA333 D Package
8-Pin SOIC
Top View
(1)
(1)
1
8
NC
-IN
2
7
V+
+IN
3
6
OUT
V-
4
5
NC
NC
(1)
Pin Functions: OPA333
PIN
NAME
I/O
DESCRIPTION
SOIC
SOT
SC70
+IN
3
3
1
I
Noninverting input
–IN
2
4
3
I
Inverting input
NC
1, 5, 8
—
—
—
No internal connection (can be left floating)
OUT
6
1
4
O
Output
V+
7
5
5
—
Positive (highest) power supply
V–
4
2
2
—
Negative (lowest) power supply
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OPA2333 DRB Package
8-Pin VSON With Exposed Thermal Pad
Top View
OUT A
1
-IN A
2
+IN A
3
V-
4
Exposed
Thermal
Die Pad
on
(2)
Underside
OPA2333 D or DGK Package
8-Pin SOIC or VSSOP
Top View
OUT A
8
V+
7
OUT B
6
-IN B
5
+IN B
1
8
V+
7
OUT B
A
-IN A
2
B
+IN A
3
6
-IN B
V-
4
5
+IN B
Pin Functions: OPA2333
PIN
NAME
I/O
DESCRIPTION
VSON
SOIC, VSSOP
+IN
—
—
I
Noninverting input
+IN A
3
3
I
Noninverting input, channel A
+IN B
5
5
I
Noninverting input, channel B
–IN
—
—
I
Inverting input
–IN A
2
2
I
Inverting input, channel A
–IN B
6
6
I
Inverting input, channel B
OUT
—
—
O
Output
OUT A
1
1
O
Output, channel A
OUT B
7
7
O
Output, channel B
V+
8
8
—
Positive (highest) power supply
V–
4
4
—
Negative (lowest) power supply
4
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SBOS351E – MARCH 2006 – REVISED DECEMBER 2015
6 Specifications
6.1 Absolute Maximum Ratings
See
(1)
MIN
Supply
Voltage
Current
MAX
Signal input terminals (2)
–0.3
(V+) + 0.3
Signal input terminals (2)
–1
1
Output short-circuit (3)
150
Operating temperature, TA
–40
150
Storage temperature, Tstg
–65
150
(2)
(3)
V
mA
Continuous
Operating junction temperature, TJ
(1)
UNIT
7
°C
Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings
only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended
Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.
Input terminals are diode-clamped to the power-supply rails. Input signals that can swing more than 0.3 V beyond the supply rails should
be current limited to 10 mA or less.
Short-circuit to ground, one amplifier per package.
6.2 ESD Ratings
VALUE
V(ESD)
(1)
(2)
Electrostatic
discharge
Human body model (HBM), per ANSI/ESDA/JEDEC JS-001 (1)
±4000
Charged-device model (CDM), per JEDEC specification JESD22-C101 (2)
±1000
UNIT
V
JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.
JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.
6.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
UNIT
Supply voltage, VS
1.8
5.5
V
Specified temperature
–40
125
°C
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6.4 Thermal Information: OPA333
OPA333
THERMAL METRIC (1)
D (SOIC)
DBV (SOT)
DCK (SC70)
8 PINS
5 PINS
5 PINS
140.1
220.8
298.4
°C/W
RθJC(top) Junction-to-case (top) thermal resistance
89.8
97.5
65.4
°C/W
RθJB
Junction-to-board thermal resistance
80.6
61.7
97.1
°C/W
ψJT
Junction-to-top characterization parameter
28.7
7.6
0.8
°C/W
ψJB
Junction-to-board characterization parameter
80.1
61.1
95.5
°C/W
—
—
—
°C/W
RθJA
Junction-to-ambient thermal resistance
RθJC(bot) Junction-to-case (bottom) thermal resistance
(1)
UNIT
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
6.5 Thermal Information: OPA2333
OPA2333
THERMAL METRIC
RθJA
(1)
Junction-to-ambient thermal resistance
D (SOIC)
DGK (VSSOP)
DRB (VSON)
8 PINS
8 PINS
8 PINS
UNIT
124.0
180.3
46.7
°C/W
RθJC(top) Junction-to-case (top) thermal resistance
73.7
48.1
26.3
°C/W
RθJB
Junction-to-board thermal resistance
64.4
100.9
22.2
°C/W
ψJT
Junction-to-top characterization parameter
18.0
2.4
1.6
°C/W
ψJB
Junction-to-board characterization parameter
63.9
99.3
22.3
°C/W
—
—
10.3
°C/W
RθJC(bot) Junction-to-case (bottom) thermal resistance
(1)
6
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report, SPRA953.
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6.6 Electrical Characteristics
At TA = 25°C, RL = 10 kΩ connected to VS / 2, VCM = VS / 2, and VOUT = VS / 2, unless otherwise noted.
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OFFSET VOLTAGE
VOS
Input offset voltage
VS = 5 V
dVOS/dT
Input offset voltage drift
TA = –40°C to 125°C
PSRR
Power-supply rejection ratio
VS = 1.8 V to 5.5 V, TA = –40°C to 125°C
Long-term stability (1)
10
0.05
μV/°C
1
5
μV/V
See note
Channel separation, dc
μV
2
0.02
(1)
µV
μV/V
0.1
INPUT BIAS CURRENT
IB
Input bias current
IOS
Input offset current
TA= 25°C
±70
TA = –40°C to 125°C
±200
±150
pA
±140
±400
NOISE
Input voltage noise
in
Input current noise
f = 0.01 Hz to 1 Hz
0.3
f = 0.1 Hz to 10 Hz
1.1
f = 10 Hz
100
μVPP
fA/√Hz
INPUT VOLTAGE
VCM
Common-mode voltage range
CMRR
Common-mode rejection ratio
(V–) – 0.1
(V–) – 0.1 V < VCM < (V+) + 0.1 V,
TA = –40°C to 125°C
106
(V+) + 0.1
V
130
dB
Differential
2
pF
Common-mode
4
pF
130
dB
INPUT CAPACITANCE
OPEN-LOOP GAIN
AOL
Open-loop voltage gain
(V–) + 100 mV < VO < (V+) – 100 mV,
RL = 10 kΩ, TA = –40°C to 125°C
106
FREQUENCY RESPONSE
GBW
Gain-bandwidth product
CL = 100 pF
350
kHz
SR
Slew rate
G = +1
0.16
V/μs
OUTPUT
Voltage output swing from rail
ISC
Short-circuit current
CL
Capacitive load drive
Open-loop output impedance
RL = 10 kΩ
30
RL = 10 kΩ, TA = –40°C to 125°C
50
70
±5
mV
mA
See Typical Characteristics
f = 350 kHz, IO = 0 A
2
kΩ
POWER SUPPLY
VS
IQ
Specified voltage range
Quiescent current per amplifier
Turn-on time
1.8
IO = 0 A
5.5
17
TA = –40°C to 125°C
25
28
VS = +5 V
V
μA
μs
100
TEMPERATURE
TA
Tstg
(1)
Specified range
–40
125
°C
Operating range
–40
150
°C
Storage range
–65
150
°C
300-hour life test at 150°C demonstrated randomly distributed variation of approximately 1 μV.
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6.7 Typical Characteristics
Table 1. List of Typical Characteristics
TITLE
FIGURE
Offset Voltage Production Distribution
Figure 1
Offset Voltage Drift Production Distribution
Figure 2
Open-Loop Gain vs Frequency
Figure 3
Common-Mode Rejection Ratio vs Frequency
Figure 4
Power-Supply Rejection Ratio vs Frequency
Figure 5
Output Voltage Swing vs Output Current
Figure 6
Input Bias Current vs Common-Mode Voltage
Figure 7
Input Bias Current vs Temperature
Figure 8
Quiescent Current vs Temperature
Figure 9
Large-Signal Step Response
Figure 10
Small-Signal Step Response
Figure 11
Positive Overvoltage Recovery
Figure 12
Negative Overvoltage Recovery
Figure 13
Settling Time vs Closed-Loop Gain
Figure 14
Small-Signal Overshoot vs Load Capacitance
Figure 15
0.1-Hz to 10-Hz Noise
Figure 16
Current and Voltage Noise Spectral Density vs Frequency
Figure 17
-10
-9
-8
-7
-6
-5
-4
-3
-2
-1
0
1
2
3
4
5
6
7
8
9
10
0
0.0025
0.0050
0.0075
0.0100
0.0125
0.0150
0.0175
0.0200
0.0225
0.0250
0.0275
0.0300
0.0325
0.0350
0.0375
0.0400
0.0425
0.0450
0.0475
0.0500
Population
Population
At TA = 25°C, VS = 5 V, and CL = 0 pF, unless otherwise noted.
Offset Voltage (mV)
Offset Voltage Drift (mV/°C)
Figure 1. Offset Voltage Production Distribution
8
Figure 2. Offset Voltage Drift Production Distribution
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At TA = 25°C, VS = 5 V, and CL = 0 pF, unless otherwise noted.
140
100
200
120
150
100
AOL (dB)
80
Phase
60
100
40
50
20
CMRR (dB)
250
Phase (°)
120
80
60
0
40
-50
20
-100
0
Gain
0
-20
10
100
1k
10k
100k
1
1M
10
100
1k
10k
100k
Figure 4. Common-Mode Rejection Ratio vs Frequency
Figure 3. Open-Loop Gain and Phase vs Frequency
120
3
VS = ±2.75 V
VS = ±0.9 V
+PSRR
2
-PSRR
Output Swing (V)
PSRR (dB)
100
80
60
40
20
0
10
100
1k
10k
100k
+25°C
+125°C
0
+25°C
-40°C
-1
+125°C
+25°C
-40°C
-3
1M
0
1
2
3
4
5
6
7
8
9
10
Frequency (Hz)
Output Current (mA)
Figure 5. Power-Supply Rejection Ratio vs Frequency
Figure 6. Output Voltage Swing vs Output Current
100
200
80
150
-IB
60
VS = 5.5 V
VS = 1.8 V
-IB
100
40
-IB
50
20
IB (pA)
IB (pA)
-40°C
1
-2
1
1M
Frequency (Hz)
Frequency (Hz)
0
-20
0
+IB
-50
-40
-100
-60
+IB
-100
0
1
+IB
-150
-80
2
3
4
5
-200
-50
-25
Common-Mode Voltage (V)
Figure 7. Input Bias Current vs Common-Mode Voltage
0
25
50
75
100
125
Temperature (°C)
Figure 8. Input Bias Current vs Temperature
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At TA = 25°C, VS = 5 V, and CL = 0 pF, unless otherwise noted.
25
G=1
RL = 10 kW
Output Voltage (1 V/div)
20
VS = 5.5 V
IQ (mA)
15
VS = 1.8 V
10
5
0
-50
-25
0
25
50
75
100
125
Time (50 ms/div)
Temperature (°C)
G = +1
RL = 10 kW
Output Voltage (50 mV/div)
Figure 10. Large-Signal Step Response
2 V/div
Figure 9. Quiescent Current vs Temperature
0
Input
Output
10 kW
+2.5 V
1 V/div
1 kW
0
OPA333
-2.5 V
Time (5 ms/div)
Time (50 ms/div)
Figure 11. Small-Signal Step Response
Figure 12. Positive Overvoltage Recovery
600
Input
0
0
10 kW
+2.5 V
Settling Time (ms)
1 V/div
2 V/div
4-V Step
500
400
300
200
0.001%
1 kW
Output
OPA333
100
-2.5 V
0
0.01%
1
10
10
100
Time (50 ms/div)
Gain (dB)
Figure 13. Negative Overvoltage Recovery
Figure 14. Settling Time vs Closed-Loop Gain
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At TA = 25°C, VS = 5 V, and CL = 0 pF, unless otherwise noted.
40
35
25
500nV/div
Overshoot (%)
30
20
15
10
5
0
100
1000
1s/div
Load Capacitance (pF)
Figure 16. 0.1-Hz to 10-Hz Noise
Figure 15. Small-Signal Overshoot
vs Load Capacitance
1000
Voltage Noise (nV/ÖHz)
1000
Continues with no 1/f (flicker) noise.
Current Noise
100
100
Voltage Noise
Current Noise (fA/ÖHz)
10
10
10
1
10
100
1k
10k
Frequency (Hz)
Figure 17. Current and Voltage Noise Spectral Density vs Frequency
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7 Detailed Description
7.1 Overview
The OPAx333 is a family of Zero-Drift, low-power, rail-to-rail input and output operational amplifiers. These
devices operate from 1.8 V to 5.5 V, are unity-gain stable, and are suitable for a wide range of general-purpose
applications. The Zero-Drift architecture provides ultra low offset voltage and near-zero offset voltage drift.
7.2 Functional Block Diagram
C2
CHOP1
GM1
CHOP2
Notch
Filter
GM2
GM3
+IN
OUT
-IN
C1
GM_FF
7.3 Feature Description
The OPA333 and OPA2333 are unity-gain stable and free from unexpected output phase reversal. These
devices use a proprietary auto-calibration technique to provide low offset voltage and very low drift over time and
temperature. For lowest offset voltage and precision performance, optimize circuit layout and mechanical
conditions. Avoid temperature gradients that create thermoelectric (Seebeck) effects in the thermocouple
junctions formed from connecting dissimilar conductors. Cancel these thermally-generated potentials by assuring
they are equal on both input terminals. Other layout and design considerations include:
• Use low thermoelectric-coefficient conditions (avoid dissimilar metals).
• Thermally isolate components from power supplies or other heat sources.
• Shield operational amplifier and input circuitry from air currents, such as cooling fans.
Following these guidelines reduces the likelihood of junctions being at different temperatures, which can cause
thermoelectric voltages of 0.1 μV/°C or higher, depending on materials used.
7.3.1 Operating Voltage
The OPA333 and OPA2333 operational amplifiers operate over a power-supply range of 1.8 V to 5.5 V (±0.9 V to
±2.75 V). Parameters that vary over supply voltage or temperature are shown in the Typical Characteristics
section.
CAUTION
Supply voltages higher than +7 V (absolute maximum) can permanently damage the
device.
12
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Feature Description (continued)
7.3.2 Input Voltage
The OPA333 and OPA2333 input common-mode voltage range extends 0.1 V beyond the supply rails. The
OPA333 is designed to cover the full range without the troublesome transition region found in some other rail-torail amplifiers.
Typically, input bias current is approximately 70 pA; however, input voltages that exceed the power supplies can
cause excessive current to flow into or out of the input pins. Momentary voltages greater than the power supply
can be tolerated if the input current is limited to 10 mA. This limitation is easily accomplished with an input
resistor, as shown in Figure 18.
Current-limiting resistor
required if input voltage
exceeds supply rails by
³ 0.5 V.
+5 V
IOVERLOAD
10 mA max
VOUT
OPA333
VIN
5 kW
Figure 18. Input Current Protection
7.3.3 Internal Offset Correction
The OPA333 and OPA2333 operational amplifiers use an auto-calibration technique with a time-continuous
350-kHz operational amplifier in the signal path. This amplifier is zero-corrected every 8 μs using a proprietary
technique. Upon power up, the amplifier requires approximately 100 μs to achieve specified VOS accuracy. This
design has no aliasing or flicker noise.
7.3.4 Achieving Output Swing to the Op Amp Negative Rail
Some applications require output voltage swings from 0 V to a positive full-scale voltage (such as 2.5 V) with
excellent accuracy. With most single-supply operational amplifiers, problems arise when the output signal
approaches 0 V, near the lower output swing limit of a single-supply operational amplifier. A good, single-supply
operational amplifier may swing close to single-supply ground, but does not reach ground. The output of the
OPA333 and OPA2333 can be made to swing to, or slightly below, ground on a single-supply power source. This
swing is achieved with the use of the use of another resistor and an additional, more negative power supply than
the operational amplifier negative supply. A pulldown resistor can be connected between the output and the
additional negative supply to pull the output down below the value that the output would otherwise achieve, as
shown in Figure 19.
V+ = +5 V
VOUT
OPA333
VIN
RP = 20 kW
Op Amp V- = GND
-5 V
Additional
Negative
Supply
Figure 19. VOUT Range to Ground
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Feature Description (continued)
The OPA333 and OPA2333 have an output stage that allows the output voltage to be pulled to the negative
supply rail, or slightly below, using the technique previously described. This technique only works with some
types of output stages. The OPA333 and OPA2333 are characterized to perform with this technique; the
recommended resistor value is approximately 20 kΩ.
NOTE
This configuration increases the current consumption by several hundreds of microamps.
Accuracy is excellent down to 0 V and as low as –2 mV. Limiting and nonlinearity occur below –2 mV, but
excellent accuracy returns after the output is again driven above –2 mV. Lowering the resistance of the pulldown
resistor allows the operational amplifier to swing even further below the negative rail. Resistances as low as
10 kΩ can be used to achieve excellent accuracy down to –10 mV.
7.3.5 DFN Package
The OPA2333 is offered in an DFN-8 package (also known as SON). The DFN is a QFN package with lead
contacts on only two sides of the bottom of the package. This leadless package maximizes board space and
enhances thermal and electrical characteristics through an exposed pad.
DFN packages are physically small, have a smaller routing area, improved thermal performance, and improved
electrical parasitics. Additionally, the absence of external leads eliminates bent-lead issues.
The DFN package can be easily mounted using standard PCB assembly techniques. See Application Reports
SLUA271, QFN/SON PCB Attachment and SCBA017, Quad Flatpack No-Lead Logic Packages, both are
available for download at www.ti.com.
NOTE
The exposed leadframe die pad on the bottom of the package should be connected to V–
or left unconnected.
7.4 Device Functional Modes
The OPAx333 device has a single functional mode. The device is powered on as long as the power supply
voltage is between 1.8 V (±0.9 V) and 5.5 V (±2.75 V).
14
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8 Application and Implementation
NOTE
Information in the following applications sections is not part of the TI component
specification, and TI does not warrant its accuracy or completeness. TI’s customers are
responsible for determining suitability of components for their purposes. Customers should
validate and test their design implementation to confirm system functionality.
8.1 Application Information
The OPAx333 family is a unity-gain stable, precision operational amplifier with very low offset voltage drift; these
devices are also free from output phase reversal. Applications with noisy or high-impedance power supplies
require decoupling capacitors close to the device power-supply pins. In most cases, 0.1-μF capacitors are
adequate.
8.2 Typical Applications
8.2.1 High-Side Voltage-to-Current (V-I) Converter
The circuit shown in Figure 20 is a high-side voltage-to-current (V-I) converter. It translates in input voltage of 0 V
to 2 V to and output current of 0 mA to 100 mA. Figure 21 shows the measured transfer function for this circuit.
The low offset voltage and offset drift of the OPA333 facilitate excellent dc accuracy for the circuit.
V+
RS2
RS3
IRS2
470
VRS2
IRS3
4.7
10 k
R4
VRS3
C7
2200 pF
R5
A2
+
V+
200
+
330
Q2
Q1
A1
R3
VIN
+
±
1000 pF
C6
10 k
VRS1
R2
RS1
2k
IRS1
VLOAD
RLOAD
ILOAD
Figure 20. High-Side Voltage-to-Current (V-I) Converter
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Typical Applications (continued)
8.2.1.1 Design Requirements
The design requirements are as follows:
• Supply Voltage: 5 V DC
• Input: 0 V to 2 V DC
• Output: 0 mA to 100 mA DC
8.2.1.2 Detailed Design Procedure
The V-I transfer function of the circuit is based on the relationship between the input voltage, VIN, and the three
current sensing resistors, RS1, RS2, and RS3. The relationship between VIN and RS1 determines the current that
flows through the first stage of the design. The current gain from the first stage to the second stage is based on
the relationship between RS2 and RS3.
For a successful design, pay close attention to the dc characteristics of the operational amplifier chosen for the
application. To meet the performance goals, this application benefits from an operational amplifier with low offset
voltage, low temperature drift, and rail-to-rail output. The OPA2333 CMOS operational amplifier is a highprecision, 5-uV offset, 0.05-μV/°C drift amplifier optimized for low-voltage, single-supply operation with an output
swing to within 50 mV of the positive rail. The OPA2333 family uses chopping techniques to provide low initial
offset voltage and near-zero drift over time and temperature. Low offset voltage and low drift reduce the offset
error in the system, making these devices appropriate for precise dc control. The rail-to-rail output stage of the
OPA2333 ensures that the output swing of the operational amplifier is able to fully control the gate of the
MOSFET devices within the supply rails.
A detailed error analysis, design procedure, and additional measured results are given in TIPD102.
8.2.1.3 Application Curve
0.1
Load
Output Current (A)
0.075
0.05
0.025
0
0
0.5
1
Input Voltage (V)
1.5
2
D001
Figure 21. Measured Transfer Function for High-Side V-I Converter
16
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Typical Applications (continued)
8.2.2 Precision, Low-Level Voltage-to-Current (V-I) Converter
The circuit shown in Figure 22 is a precision, low-level voltage-to-current (V-I) converter. The converter translates
in input voltage of 0 V to 5 V and output current of 0 µA to 5 µA. Figure 23 shows the measured transfer function
for this circuit. The low offset voltage and offset drift of the OPA333 facilitate excellent dc accuracy for the circuit.
Figure 24 shows the calibrated error for the entire range of the circuit.
R3 100 k
C1 10 nF
R4 100 k
5V
VOUT_OPA
OPA333
+R1
+
U2
INA326
R1
40.2 k
Rset
100 k
+
5V
VOUT_INA
R1
±
VIN
RLOAD
IOUT
R2
R2
200 k
C2 1 nF
+
A
AM1
Figure 22. Low-Level, Precision V-I Converter
8.2.2.1 Design Requirements
The design requirements are as follows:
• Supply Voltage: 5 V DC
• Input: 0 V to 5 V DC
• Output: 0 μA to 5 μA DC
8.2.2.2 Detailed Design Procedure
The V-I transfer function of the circuit is based on the relationship between the input voltage, VIN, RSET, and the
instrumentation amplifier (INA) gain. During operation, the input voltage divided by the INA gain appears across
the set resistor in Equation 1:
VSET = VIN/GINA
(1)
The current through RSET must flow through the load, so IOUT is VSET / RSET. IOUT remains a well-regulated current
as long as the total voltage across RSET and RLOAD does not violate the output limits of the operational amplifier
or the input common-mode limits of the INA. The voltage across the set resistor (VSET) is the input voltage
divided by the INA gain (that is, VSET = 1 V / 10 = 0.1 V). The current is determined by VSET and RSET shown in
Equation 2:
IOUT = VSET / RSET = 0.1 V / 100 kΩ = 1 μA
(2)
A detailed error analysis, design procedure, and additional measured results are given in TIPD107.
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Typical Applications (continued)
8.2.2.3 Application Curves
100
Measured Output Current Error (pA)
Output Current (µA)
0.1
0.075
0.05
0.025
0
0
80
60
40
20
0
–20
–40
–60
–80
–100
1
3
2
Input Voltage (V)
5
4
0
1
3
4
2
Desired Output Current, Iout_desired (µA)
D002
Figure 23. Measured Transfer Function for Low-Level
Precision V-I
5
D002
Figure 24. Calibrated Output Error for Low-Level V-I
8.2.3 Composite Amplifier
The circuit shown in Figure 25 is a composite amplifier used to drive the reference on the ADS8881. The
OPA333 provides excellent dc accuracy, and the THS4281 allows the output of the circuit to respond quickly to
the transient current requirements of a typical SAR data converter reference input. The ADS8881 system was
optimized for THD and achieved a measured performance of –110 dB. The linearity of the ADC is shown
Figure 26.
REFERENCE DRIVE CIRCUIT
20k
1µF
THS4281
+
-
1k
AVDD
+
0.2
1µF
AVDD
+
OPA333
+
Vout
AVDD
10µF
REF5045
1k
Vin
Temp
1µF
Trim Gnd
1µF
1K
1K
AVDD
AVDD
VIN+
THS4521
+ + -
VCM
-
10
REFP AVDD
AINP
V+
10nF
+
AINM
10
GND
CONVST
+
VIN-
CONVST
ADS8881
1K
1K
INPUT DRIVER
18-Bit 1MSPS
SAR ADC
Figure 25. Composite Amplifier Reference Driver Circuit
18
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Typical Applications (continued)
8.2.3.1 Design Requirements
The design requirements for this block design are:
• System Supply Voltage: 5 V DC
• ADC Supply Voltage: 3.3 V DC
• ADC Sampling Rate: 1 MSPS
• ADC Reference Voltage (VREF): 4.5 V DC
• ADC Input Signal: A differential input signal with amplitude of Vpk = 4.315 V (–0.4 dBFS to avoid clipping) and
frequency, fIN = 10 kHz are applied to each differential input of the ADC
8.2.3.2 Detailed Design Procedure
The two primary design considerations to maximize the performance of a high-resolution SAR ADC are the input
driver and the reference driver design. The circuit comprises the critical analog circuit blocks, the input driver,
anti-aliasing filter, and the reference driver. Each analog circuit block should be carefully designed based on the
ADC performance specifications in order to maximize the distortion and noise performance of the data
acquisition system while consuming low power. The diagram includes the most important specifications for each
individual analog block. This design systematically approaches the design of each analog circuit block to achieve
a 16-bit, low-noise and low-distortion data acquisition system for a 10-kHz sinusoidal input signal. The first step
in the design requires an understanding of the requirement of extremely low distortion input driver amplifier. This
understanding helps in the decision of an appropriate input driver configuration and selection of an input amplifier
to meet the system requirements. The next important step is the design of the anti-aliasing RC-filter to attenuate
ADC kick-back noise while maintaining the amplifier stability. The final design challenge is to design a highprecision reference driver circuit, which would provide the required value VREF with low offset, drift, and noise
contributions.
In designing a very low distortion data acquisition block, it is important to understand the sources of nonlinearity.
Both the ADC and the input driver introduce nonlinearity in a data acquisition block. To achieve the lowest
distortion, the input driver for a high-performance SAR ADC must have a distortion that is negligible against the
ADC distortion. This parameter requires the input driver distortion to be 10 dB lower than the ADC THD. This
stringent requirement ensures that overall THD of the system is not degraded by more than –0.5 dB.
THDAMP < THDADC – 10 dB
(3)
It is therefore important to choose an amplifier that meets the above criteria to avoid the system THD from being
limited by the input driver. The amplifier nonlinearity in a feedback system depends on the available loop gain. A
detailed error analysis, design procedure, and additional measured results are given in TIPD115.
8.2.3.3 Application Curve
Integral Non-Linearity Error (LSB)
1.5
1
0.5
0
–0.5
–1
–1.5
–4.5
–3.5 –2.5
–1.5 –0.5 0.5
1.5
ADC Differential Input
2.5
3.5
4.5
D002
Figure 26. Linearity of the ADC8881 System
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8.3 System Examples
8.3.1 Temperature Measurement Application
Figure 27 shows a temperature measurement application.
REF3140
+5 V
0.1 mF
4.096 V
+
R9
150 kW
R1
6.04 kW
R5
31.6 kW
D1
+5 V
0.1 mF
+
-
R2
2.94 kW
-
+ +
R2
549 W
R4
6.04 kW
VO
OPA333
R6
200 W
K-Type
Thermocouple
40.7 mV/°C
Zero
Adjust
R3
60.4 W
Figure 27. Temperature Measurementf
8.3.2 Single Operational Amplifier Bridge Amplifier Application
Figure 28 shows the basic configuration for a bridge amplifier.
VEX
R1
+5 V
R R
R R
VOUT
OPA333
R1
VREF
Figure 28. Single Operational Amplifier Bridge Amplifier
8.3.3 Low-Side Current Monitor Application
A low-side current shunt monitor is shown in Figure 29. RN are operational resistors used to isolate the ADS1100
from the noise of the digital I2C bus. The ADS1100 is a 16-bit converter; therefore, a precise reference is
essential for maximum accuracy. If absolute accuracy is not required and the 5-V power supply is sufficiently
stable, the REF3130 can be omitted.
3V
+5 V
REF3130
Load
R1
4.99 kW
R2
49.9 kW
R6
71.5 kW
V
ILOAD
RSHUNT
1W
RN
56 W
OPA333
R3
4.99 kW
Stray Ground-Loop Resistance
R4
48.7 kW
ADS1100
R7
1.18 kW
RN
56 W
2
IC
(PGA Gain = 4)
FS = 3.0 V
NOTE: 1% resistors provide adequate common-mode rejection at small ground-loop errors.
Figure 29. Low-Side Current Monitor
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8.3.4 Other Applications
Additional application ideas are shown in Figure 30 through Figure 33.
RG
zener
RSHUNT
(1)
V+
(2)
R1
10 kW
MOSFET rated to
stand-off supply voltage
such as BSS84 for
up to 50 V.
OPA333
+5V
V+
Two zener
biasing methods
(3)
are shown.
Output
Load
RBIAS
RL
(1)
Zener rated for op amp supply capability (that is, 5.1 V for OPA333).
(2)
Current-limiting resistor.
(3)
Choose zener biasing resistor or dual N-MOSFETs (FDG6301N, NTJD4001N, or Si1034).
Figure 30. High-Side Current Monitor
100 kW
1 MW
60 kW
3V
NTC
Thermistor
1 MW
OPA333
Figure 31. Thermistor Measurement
V1
-In
INA152
OPA333
R2
R1
2
5
6
VO
R2
3
1
OPA333
V2
+In
VO = (1 + 2R2 / R1) (V2 - V1)
Figure 32. Precision Instrumentation Amplifier
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+VS
R1
100 kW
fLPF = 150 Hz
C4
1.06 nF
1/2
OPA2333
RA
+VS
R2
100 kW
R6
100 kW
1/2
OPA2333
+VS
3
2
LL
7
INA321
(1)
4
5
R8
100 kW
+VS
ac
dc
R3
100 kW
1/2
OPA2333
GINA = 5
R12
5 kW
6
+VS
1
C3
1 mF
VOUT
OPA333
R13
318 kW
GOPA = 200
+VS
1/2
OPA2333
Wilson
LA
R14
1 MW
GTOT = 1 kV/V
R7
100 kW
VCENTRAL
C1
47 pF
(RA + LA + LL) / 3
fHPF = 0.5 Hz
(provides ac signal coupling)
1/2 VS
R5
390 kW
R9
20 kW
+VS
R4
100 kW
RL
1/2
OPA2333
Inverted
VCM
+VS
VS = +2.7 V to +5.5 V
BW = 0.5 Hz to 150 Hz
1/2
OPA2333
+VS
R10
1 MW
1/2 VS
C2
0.64 mF
R11
1 MW
fO = 0.5 Hz
(1)
Other instrumentation amplifiers can be used, such as the INA326, which has lower noise, but higher quiescent
current.
Figure 33. Single-Supply, Very Low Power, ECG Circuit
9 Power Supply Recommendations
The OPAx333 is specified for operation from 1.8 V to 5.5 V (±0.9 V to ±2.75 V); many specifications apply from
–40°C to 125°C. The Typical Characteristics presents parameters that can exhibit significant variance with regard
to operating voltage or temperature.
CAUTION
Supply voltages larger than 7 V can permanently damage the device (see the Absolute
Maximum Ratings).
TI recommends placing 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in
from noisy or high-impedance power supplies. For more detailed information on bypass capacitor placement,
refer to the Layout section.
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10 Layout
10.1 Layout Guidelines
10.1.1 General Layout Guidelines
Pay attention to good layout practices. Keep traces short and when possible, use a printed-circuit-board (PCB)
ground plane with surface-mount components placed as close to the device pins as possible. Place a 0.1-μF
capacitor closely across the supply pins. Apply these guidelines throughout the analog circuit to improve
performance and provide benefits, such as reducing the electromagnetic interference (EMI) susceptibility.
Operational amplifiers vary in susceptibility to radio frequency interference (RFI). RFI can generally be identified
as a variation in offset voltage or DC signal levels with changes in the interfering RF signal. The OPA333 is
specifically designed to minimize susceptibility to RFI and demonstrates remarkably low sensitivity compared to
previous generation devices. Strong RF fields may still cause varying offset levels.
10.1.2 DFN Layout Guidelines
Solder the exposed leadframe die pad on the DFN package to a thermal pad on the PCB. A mechanical drawing
showing an example layout is attached at the end of this data sheet. Refinements to this layout may be
necessary based on assembly process requirements. Mechanical drawings located at the end of this data sheet
list the physical dimensions for the package and pad. The five holes in the landing pattern are optional, and are
intended for use with thermal vias that connect the leadframe die pad to the heatsink area on the PCB.
Soldering the exposed pad significantly improves board-level reliability during temperature cycling, key push,
package shear, and similar board-level tests. Even with applications that have low-power dissipation, the
exposed pad must be soldered to the PCB to provide structural integrity and long-term reliability.
10.2 Layout Example
+
VIN
VOUT
RG
RF
(Schematic Representation)
Run the input traces
as far away from
the supply lines
as possible
Place components
close to device and to
each other to reduce
parasitic errors
VS+
RF
N/C
N/C
GND
±IN
V+
VIN
+IN
OUTPUT
V±
N/C
RG
Use low-ESR,
ceramic bypass
capacitor
GND
VS±
GND
Use low-ESR, ceramic
bypass capacitor
VOUT
Ground (GND) plane on another layer
Figure 34. Layout Example
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11 Device and Documentation Support
11.1 Device Support
11.1.1 Development Support
For development support on this product, see the following:
• High-Side V-I Converter, 0 V to 2 V to 0 mA to 100 mA, 1% Full-Scale Error, TIPD102
• Low-Level V-to-I Converter Reference Design, 0-V to 5-V Input to 0-µA to 5-µA Output, TIPD107
• 18-Bit, 1-MSPS, Serial Interface, microPower, Truly-Differential Input, SAR ADC, ADS8881
• Very Low-Power, High-Speed, Rail-To-Rail Input/Output, Voltage Feedback Operational Amplifier, THS4281
• Data Acquisition Optimized for Lowest Distortion, Lowest Noise, 18-bit, 1-MSPS Reference Design, TIPD115
• Self-Calibrating, 16-Bit Analog-to-Digital Converter, ADS1100
• 20-ppm/Degrees C Max, 100-µA, SOT23-3 Series Voltage Reference, REF3130
• Precision, Low Drift, CMOS Instrumentation Amplifier, INA326, INA326
11.2 Documentation Support
11.2.1 Related Documentation
For related documentation, see the following:
• QFN/SON PCB Attachment, SLUA271
• Quad Flatpack No-Lead Logic Packages, SCBA017
11.3 Related Links
Table 2 lists quick access links. Categories include technical documents, support and community resources,
tools and software, and quick access to sample or buy.
Table 2. Related Links
PARTS
PRODUCT FOLDER
SAMPLE & BUY
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
OPA333
Click here
Click here
Click here
Click here
Click here
OPA2333
Click here
Click here
Click here
Click here
Click here
11.4 Community Resources
The following links connect to TI community resources. Linked contents are provided "AS IS" by the respective
contributors. They do not constitute TI specifications and do not necessarily reflect TI's views; see TI's Terms of
Use.
TI E2E™ Online Community TI's Engineer-to-Engineer (E2E) Community. Created to foster collaboration
among engineers. At e2e.ti.com, you can ask questions, share knowledge, explore ideas and help
solve problems with fellow engineers.
Design Support TI's Design Support Quickly find helpful E2E forums along with design support tools and
contact information for technical support.
11.5 Trademarks
E2E is a trademark of Texas Instruments.
All other trademarks are the property of their respective owners.
11.6 Electrostatic Discharge Caution
These devices have limited built-in ESD protection. The leads should be shorted together or the device placed in conductive foam
during storage or handling to prevent electrostatic damage to the MOS gates.
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11.7 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
12 Mechanical, Packaging, and Orderable Information
The following pages include mechanical, packaging, and orderable information. This information is the most
current data available for the designated devices. This data is subject to change without notice and revision of
this document. For browser-based versions of this data sheet, refer to the left-hand navigation.
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PACKAGE OPTION ADDENDUM
www.ti.com
11-Aug-2021
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
OPA2333AID
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
O2333A
OPA2333AIDG4
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
O2333A
OPA2333AIDGKR
ACTIVE
VSSOP
DGK
8
2500
RoHS & Green
NIPDAUAG
Level-1-260C-UNLIM
-40 to 125
OBAQ
OPA2333AIDGKRG4
ACTIVE
VSSOP
DGK
8
2500
RoHS & Green
NIPDAUAG
Level-1-260C-UNLIM
-40 to 125
OBAQ
OPA2333AIDGKT
ACTIVE
VSSOP
DGK
8
250
RoHS & Green
NIPDAUAG
Level-1-260C-UNLIM
-40 to 125
OBAQ
OPA2333AIDGKTG4
ACTIVE
VSSOP
DGK
8
250
RoHS & Green
NIPDAUAG
Level-1-260C-UNLIM
-40 to 125
OBAQ
OPA2333AIDR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
O2333A
OPA2333AIDRBR
ACTIVE
SON
DRB
8
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BQZ
OPA2333AIDRBT
ACTIVE
SON
DRB
8
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BQZ
OPA2333AIDRBTG4
ACTIVE
SON
DRB
8
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
BQZ
OPA2333AIDRG4
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
O2333A
OPA333AID
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
O333A
OPA333AIDBVR
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
OAXQ
OPA333AIDBVRG4
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
OAXQ
OPA333AIDBVT
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
OAXQ
OPA333AIDBVTG4
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
OAXQ
OPA333AIDCKR
ACTIVE
SC70
DCK
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
BQY
OPA333AIDCKRG4
ACTIVE
SC70
DCK
5
3000
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
BQY
OPA333AIDCKT
ACTIVE
SC70
DCK
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
BQY
OPA333AIDCKTG4
ACTIVE
SC70
DCK
5
250
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
BQY
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
11-Aug-2021
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
(2)
Lead finish/
Ball material
MSL Peak Temp
Op Temp (°C)
Device Marking
(3)
(4/5)
(6)
OPA333AIDG4
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
O333A
OPA333AIDR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-1-260C-UNLIM
-40 to 125
O333A
(1)
The marketing status values are defined as follows:
ACTIVE: Product device recommended for new designs.
LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.
NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.
PREVIEW: Device has been announced but is not in production. Samples may or may not be available.
OBSOLETE: TI has discontinued the production of the device.
(2)
RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance
do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may
reference these types of products as "Pb-Free".
RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.
Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of
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