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OPA202, OPA2202, OPA4202
SBOS812H – OCTOBER 2017 – REVISED MAY 2020
OPAx202 Precision, Low-Noise, Heavy Capacitive Drive, 36-V Operational Amplifiers
1 Features
3 Description
•
The OPA202, OPA2202, and OPA4202 (OPAx202)
are a family of devices built on TI's industry-leading
precision
super-beta,
complementary,
bipolar
semiconductor process. This process offers ultra-low
flicker noise, low offset voltage, low offset voltage
temperature drift, and excellent linearity with
common-mode and power-supply variation. These
devices offer an exceptional combination of dc
precision, heavy capacitive load drive, and protection
against external EMI, thermal, and short-circuit
events.
•
•
•
•
•
•
•
Precision super-beta performance:
– Low offset voltage: 200 µV (maximum)
– Ultra-low drift: 1 µV/°C (maximum)
Excellent efficiency:
– Quiescent current: 580 µA (typical)
– Gain-bandwidth product: 1 MHz
– Low input voltage noise: 9 nV/√Hz
Ease of use, design simplicity:
– Heavy capacitive load drive: 5-µs settling time
with 25 nF
– Ultra-high input impedance: 3000 GΩ and
0.5 pF
– EMI hardened, thermal, and short-circuit
protection
Stable Performance:
– High CMRR and AOL: 126 dB (minimum)
– High PSRR: 126 dB (minimum)
Low bias current: 2 nA (maximum)
Low 0.1-Hz to 10-Hz noise: 0.2 µVPP
Wide supply voltage: ±2.25 V to ±18 V
Replaces OP-07 and OP-27
The supply current is 580 µA at ±18 V. The OPAx202
do not exhibit phase inversion, and the series is
stable with high capacitive loads. The OPAx202 are
fully specified with a temperature range from –40°C
to +105°C.
Device Information(1)
PART NUMBER
OPA202
OPA2202
OPA4202
2 Applications
•
•
•
•
•
BODY SIZE (NOM)
4.90 mm × 3.91 mm
SOT-23 (5)
2.90 mm × 1.60 mm
VSSOP (8)
3.00 mm × 3.00 mm
VSSOP (8)
3.00 mm × 3.00 mm
SOIC (8)
4.90 mm × 3.91 mm
SOIC (14)
8.65 mm × 3.91 mm
TSSOP (14)
5.00 mm × 4.40 mm
(1) For all available packages, see the package option addendum
at the end of the data sheet.
Data acquisition (DAQ)
Lab and field instrumentation
Merchant network and server PSU
Multiparameter patient monitor
String inverter
OPAx202 Excel Even When Directly Driving Heavy
Capacitive Loads
Input Voltage Noise and Current Noise Spectral
Density vs Frequency
1000
Voltage Noise Spectral Density (nV/—Hz)
10
8
6
Output Voltage (mV)
PACKAGE
SOIC (8)
4
2
25000 pF
0
±2
±4
±6
±8
0
1
2
3
Time ( s)
4
100
100
10
10
Voltage Noise
Current Noise
1
10m
CL = 28 pF to 25000 pF
±10
1000
100m
1
10
100
1k
Frequency (Hz)
10k
100k
Current Noise Spectral Density (fA/—Hz)
1
1
1M
5
C003
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.
OPA202, OPA2202, OPA4202
SBOS812H – OCTOBER 2017 – REVISED MAY 2020
www.ti.com
Table of Contents
1
2
3
4
5
6
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Pin Configuration and Functions .........................
Specifications.........................................................
6.1
6.2
6.3
6.4
6.5
6.6
6.7
6.8
6.9
7
1
1
1
2
4
7
Absolute Maximum Ratings ...................................... 7
ESD Ratings.............................................................. 7
Recommended Operating Conditions....................... 7
Thermal Information: OPA202 .................................. 8
Thermal Information: OPA2202 ................................ 8
Thermal Information: OPA4202 ................................ 8
Electrical Characteristics........................................... 9
Typical Characteristics ............................................ 11
Typical Characteristics ............................................ 12
Detailed Description ............................................ 19
7.1 Overview ................................................................. 19
7.2 Functional Block Diagram ....................................... 19
7.3 Feature Description................................................. 20
7.4 Device Functional Modes........................................ 26
8
Application and Implementation ........................ 27
8.1 Application Information............................................ 27
8.2 Typical Application ................................................. 29
9 Power Supply Recommendations...................... 30
10 Layout................................................................... 31
10.1 Layout Guidelines ................................................. 31
10.2 Layout Example .................................................... 31
11 Device and Documentation Support ................. 32
11.1
11.2
11.3
11.4
11.5
11.6
11.7
11.8
Device Support......................................................
Documentation Support ........................................
Related Links ........................................................
Receiving Notification of Documentation Updates
Support Resources ...............................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
32
32
33
33
33
33
33
33
12 Mechanical, Packaging, and Orderable
Information ........................................................... 33
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision G (March 2020) to Revision H
•
Page
Changed OPA202 VSSOP (DGK) and OPA2202 SOIC (D) packages from preview to production data (active) ................. 1
Changes from Revision F (February 2020) to Revision G
Page
•
Changed OPA4202 14-pin TSSOP (PW) package from preview to production data (active) ............................................... 1
•
Added OPA2202 8-pin SOIC (D) preview package and associated content to data sheet ................................................... 1
Changes from Revision E (February 2020) to Revision F
Page
•
Added OPA4202 14-pin TSSOP (PW) preview package and associated content to data sheet........................................... 1
•
Changed Figure 19, Input Voltage Noise and Current Noise Spectral Density vs Frequency, to more accurately
represent the input current noise behavior of the device ..................................................................................................... 15
Changes from Revision D (December 2019) to Revision E
•
Page
Added OPA202 8-pin VSSOP (DGK) preview package and associated content to data sheet............................................. 1
Changes from Revision C (October 2018) to Revision D
•
Page
Changed OPA2202 and OPA4202 devices from advanced information (preview) to production data (active) .................... 1
Changes from Revision B (December 2018) to Revision C
Page
•
Added OPA2202 and OPA4202 preview devices and associated content to data sheet ...................................................... 1
•
Deleted Operating Voltage section; redundant information.................................................................................................. 20
2
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SBOS812H – OCTOBER 2017 – REVISED MAY 2020
Changes from Revision A (September 2018) to Revision B
•
Page
Changed SOT-23 package from preview to production data ................................................................................................. 1
Changes from Original (October 2017) to Revision A
•
Page
Added preview content for SOT-23 package offering ........................................................................................................... 1
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Product Folder Links: OPA202 OPA2202 OPA4202
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3
OPA202, OPA2202, OPA4202
SBOS812H – OCTOBER 2017 – REVISED MAY 2020
www.ti.com
5 Pin Configuration and Functions
OPA202 D and DGK Packages
8-Pin SOIC and 8-Pin VSSOP
Top View
±IN
2
+IN
3
V±
4
8
NC
±
7
V+
+
6
OUT
5
NC
OUT
1
V±
2
+IN
3
Not to scale
5
V+
4
±IN
±
1
+
NC
OPA202 DBV Package
5-Pin SOT-23
Top View
Not to scale
Pin Functions: OPA202
PIN
NO.
NAME
I/O
DESCRIPTION
D (SOIC)
DGK (VSSOP)
DBV (SOT-23)
–IN
2
4
I
Inverting input
+IN
3
3
I
Noninverting input
NC
1, 5, 8
—
—
No internal connection (can be left floating)
OUT
6
1
O
Output
V–
4
2
—
Negative (lowest) power supply
V+
7
5
—
Positive (highest) power supply
4
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SBOS812H – OCTOBER 2017 – REVISED MAY 2020
OPA2202 D and DGK Packages
8-Pin SOIC VSSOP
Top View
OUT A
1
8
V+
±IN A
2
7
OUT B
+IN A
3
6
±IN B
V±
4
5
+IN B
Not to scale
Pin Functions: OPA2202
PIN
I/O
DESCRIPTION
NAME
NO.
–IN A
2
I
Inverting input channel A
+IN A
3
I
Noninverting input channel A
–IN B
6
I
Inverting input channel B
+IN B
5
I
Noninverting input channel B
OUT A
1
O
Output channel A
OUT B
7
O
Output channel B
V–
4
—
Negative supply
V+
8
—
Positive supply
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SBOS812H – OCTOBER 2017 – REVISED MAY 2020
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OPA4202 D and PW Packages
14-Pin SOIC and 14-Pin TSSOP
Top View
OUT A
1
14
OUT D
±IN A
2
13
±IN D
+IN A
3
12
+IN D
V+
4
11
V±
+IN B
5
10
+IN C
±IN B
6
9
±IN C
OUT B
7
8
OUT C
Not to scale
Pin Functions: OPA4202
PIN
I/O
DESCRIPTION
NAME
NO.
–IN A
2
I
Inverting input channel A
+IN A
3
I
Noninverting input channel A
–IN B
6
I
Inverting input channel B
+IN B
5
I
Noninverting input channel B
–IN C
9
I
Inverting input channel C
+IN C
10
I
Noninverting input channel C
–IN D
13
I
Inverting input channel D
+IN D
12
I
Noninverting input channel D
OUT A
1
O
Output channel A
OUT B
7
O
Output channel B
OUT C
8
O
Output channel C
OUT D
14
O
Output channel D
V–
11
—
Negative supply
V+
4
—
Positive supply
6
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SBOS812H – OCTOBER 2017 – REVISED MAY 2020
6 Specifications
6.1 Absolute Maximum Ratings
over operating free-air temperature range (unless otherwise noted) (1)
MIN
Supply voltage,
VS = (V+) – (V–)
Signal input pins
MAX
Single-supply
Dual-supply
±20
Common-mode (2)
Voltage
(V–) – 0.5
±0.5
Current
±10
–40
125
Junction temperature, TJ
125
Storage temperature, Tstg
(3)
(4)
mA
Continuous
Operating temperature, TA
(2)
V
(V+) + 0.5
Differential (3)
Output short current (4)
(1)
UNIT
40
–65
°C
150
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 swing more than 0.5 V beyond the supply rails must be
current-limited to 10 mA or less.
Input terminals are anti-parallel diode-clamped to each other. Input signals that cause differential voltages of swing more than ± 0.5 V
must 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)
±2500
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
VS
Supply voltage, [ (V+) – (V–) ]
TA
Specified temperature
Single-supply
Dual-supply
NOM
MAX
4.5
36
±2.25
±18
–40
105
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UNIT
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V
°C
7
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SBOS812H – OCTOBER 2017 – REVISED MAY 2020
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6.4 Thermal Information: OPA202
OPA202
THERMAL METRIC (1)
D (SOIC)
DGK (VSSOP)
DBV (SOT-23)
8 PINS
8 PINS
5 PINS
UNIT
190.8
206.0
°C/W
RθJA
Junction-to-ambient thermal resistance
136
RθJC(top)
Junction-to-case (top) thermal resistance
74
82.3
121.8
°C/W
RθJB
Junction-to-board thermal resistance
62
113.0
65.9
°C/W
ΨJT
Junction-to-top characterization parameter
19.7
19.0
39.0
°C/W
ΨJB
Junction-to-board characterization parameter
54.8
111.2
65.6
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
N/A
N/A
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.5 Thermal Information: OPA2202
OPA2202
THERMAL METRIC
(1)
DGK (VSSOP)
D (SOIC)
8 PINS
8 PINS
UNIT
180.1
121.5
°C/W
RθJA
Junction-to-ambient thermal resistance
RθJC(top)
Junction-to-case (top) thermal resistance
68.3
64.3
°C/W
RθJB
Junction-to-board thermal resistance
101.4
65
°C/W
ΨJT
Junction-to-top characterization parameter
10.5
18.2
°C/W
ΨJB
Junction-to-board characterization parameter
99.8
64.3
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
N/A
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
6.6 Thermal Information: OPA4202
OPA4202
THERMAL METRIC
(1)
D (SOIC)
PW (TSSOP)
14 PINS
14 PINS
UNIT
RθJA
Junction-to-ambient thermal resistance
87.9
116.6
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
42.7
39.5
°C/W
RθJB
Junction-to-board thermal resistance
44.6
61.4
°C/W
ΨJT
Junction-to-top characterization parameter
8.9
3.6
°C/W
ΨJB
Junction-to-board characterization parameter
44.1
60.6
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
N/A
N/A
°C/W
(1)
8
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
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SBOS812H – OCTOBER 2017 – REVISED MAY 2020
6.7 Electrical Characteristics
at TA = 25°C, VS = ±18 V, VCM = VS / 2, and VOUT = VS / 2, RL = 10 kΩ connected to VS / 2 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
±20
±200
UNIT
OFFSET VOLTAGE
VOS
Input offset voltage
dVOS/dT
Input offset voltage drift
PSRR
Input offset voltage
versus power supply
VS = ±18 V
VS = ±18 V, TA = –40°C to +105°C
µV
±250
OPA202, OPA4202
TA = –40°C to +105°C
±0.5
±1
µV/°C
OPA2202
TA = –40°C to +105°C
±0.5
±1.5
µV/°C
±0.1
±0.5
VS = ±2.25 V to ±18 V
VS = ±2.25 V to ±18 V, TA = –40°C to +105°C
µV/V
±0.5
INPUT BIAS CURRENT
IB
Input bias current
±0.25
TA = –40°C to +105°C
OPA202 (D, DBV)
IOS
Input offset current
OPA202 (DGK),
OPA2202, OPA4202
±2
nA
±2.1
±15
TA = –40°C to +105°C
±150
±700
±25
TA = –40°C to +105°C
pA
±250
±700
NOISE
Input voltage noise
en
in
Input voltage noise
density
Input current noise
f = 0.1 Hz to 10 Hz
0.2
µVPP
0.03
µVRMS
f = 10 Hz
9.5
f = 100 Hz
9.1
f = 1 kHz
9
f = 1 kHz
0.076
nV/√Hz
pA/√Hz
INPUT VOLTAGE RANGE
VCM
Common-mode voltage
range
(V–) + 1.5
VS = ±2.25 V
CMRR
Common-mode rejection
ratio
VS = ±18 V
(V–) + 1.5 V < VCM < (V+) – 1.5 V
114
(V–) + 1.5 V < VCM < (V+) – 1.5 V,
TA = –40°C to +105°C
114
(V–) + 1.5 V < VCM < (V+) – 1.5 V
126
(V–) + 1.5 V < VCM < (V+) – 1.5 V,
TA = –40°C to +105°C
119
(V+) – 1.5
V
131
dB
148
INPUT CAPACITANCE
Differential
Common-mode
10 || 3.3
MΩ || pF
3 || 0.5
TΩ || pF
OPEN-LOOP GAIN
VS = ±2.25 V
VS = ±18 V
AOL
Open-loop voltage gain
VS = ±2.25 V
VS = ±18 V
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 10 kΩ
120
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 10 kΩ, TA = –40℃ to +105℃
119
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 10 kΩ
126
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 10 kΩ, TA = –40℃ to +105℃
126
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 2 kΩ
120
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 2 kΩ, TA = –40℃ to +105℃
119
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 2 kΩ
126
(V–) + 1.25 V ≤ VO ≤ (V+) – 1.25 V,
RL = 2 kΩ, TA = –40℃ to +105℃
126
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135
150
dB
133
150
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Electrical Characteristics (continued)
at TA = 25°C, VS = ±18 V, VCM = VS / 2, and VOUT = VS / 2, RL = 10 kΩ connected to VS / 2 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
FREQUENCY RESPONSE
GBW
Gain-bandwidth product
SR
Slew rate
tS
Settling time
THD+N
10-V step, G = 1
1
MHz
0.35
V/µs
To 0.1%, 10-V step , G = 1
30
To 0.01%, 10-V step , G = 1
32
Overload recovery time
VIN × gain > VS
Total harmonic distortion
+ noise
VO = 3 VRMS, G = 1, f = 1 kHz, RL = 10 kΩ
µs
4
µs
0.0002%
OUTPUT
Voltage output swing
from rail
VS = ±18 V
TA = 25°C, No Load
650
750
TA = 25°C, RL = 10 kΩ
800
900
TA = 25°C, RL = 2 kΩ
1.05
1.15
TA = –40°C to +105°C, RL = 10 kΩ
1
AOL > 120 dB, RL = 10 kΩ
1.05
AOL > 120 dB, RL = 2 kΩ
ISC
Short-circuit current
CLOAD
Capacitive load drive
ZO
Open-loop output
impedance
mV
V
1.25
Sinking
35
Sourcing
35
mA
Figure 28
IO = 0 mA, f = 1 MHz; see Figure 27
Ω
50
POWER SUPPLY
IQ
10
Quiescent current per
amplifier
IO = 0 mA
580
IO = 0 mA, TA = –40°C to +105°C
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800
900
µA
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6.8 Typical Characteristics
Table 1. Table of Graphs
DESCRIPTION
FIGURE
Offset Voltage Production Distribution
Figure 1
Offset Voltage Drift Distribution From –40°C to +105°C
Figure 2
Input Bias Current Production Distribution
Figure 3
Input Offset Current Production Distribution
Figure 4
Offset Voltage vs Temperature
Figure 5
Offset Voltage vs Common-Mode Voltage
Figure 6
Offset Voltage vs Supply Voltage
Figure 7
Open-Loop Gain and Phase vs Frequency
Figure 8
Closed-Loop Gain vs Frequency
Figure 9
Input Bias Current vs Common-Mode Voltage
Figure 10
Input Bias Current and Offset vs Temperature
Figure 11
Output Voltage Swing vs Output Current
Figure 12
Output Voltage Swing vs Output Current (Sourcing)
Figure 13
Output Voltage Swing vs Output Current (Sinking)
Figure 14
CMRR and PSRR vs Frequency
Figure 15
CMRR vs Temperature
Figure 16
PSRR vs Temperature
Figure 17
0.1-Hz to 10-Hz Voltage Noise
Figure 18
Input Voltage Noise Spectral Density vs Frequency
Figure 19
THD+N Ratio vs Frequency
Figure 20
THD+N vs Output Amplitude
Figure 21
Quiescent Current vs Supply Voltage
Figure 22
Quiescent Current vs Temperature
Figure 23
Open-Loop Gain vs Temperature (10-kΩ)
Figure 24
Open-Loop Gain vs Output Voltage Swing to Supply
Figure 25, Figure 26
Open-Loop Output Impedance vs Frequency
Figure 27
Small-Signal Overshoot vs Capacitive Load (10-mV Step)
Figure 28
No Phase Reversal
Figure 29
Positive Overload Recovery
Figure 30
Negative Overload Recovery
Figure 31
Small-Signal Step Response (10-mV Step)
Figure 32, Figure 33
Large-Signal Step Response (10-V Step)
Figure 34, Figure 35
Settling Time (10-V Step)
Figure 36
Short-Circuit Current vs Temperature
Figure 37
Maximum Output Voltage vs Frequency
Figure 38
EMIRR vs Frequency
Figure 39
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6.9 Typical Characteristics
at TA = 25°C, VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF (unless otherwise noted)
20
30
25
Amplifiers (%)
Amplifiers (%)
15
10
20
15
10
5
5
σ = 32.09 µV
µ = –18.23 nV/°C
TA = –40°C to +105°C
N = 252
1
±IN Bias Current
16
30
12
25
8
Amplifiers (%)
4
4
8
20
15
10
12
5
50
40
30
20
10
0
-10
-20
-50
Input Offset Current (pA)
Input Bias Current (pA)
µ–IN = 112.335 pA
µ+IN = 112.448 pA
0
600
500
400
200
100
0
-100
-200
-300
-400
-500
-600
20
300
+IN Bias Current
-30
16
-40
Amplifiers (%)
N = 252
Figure 2. Offset Voltage Drift Distribution
0
Amplifiers (%)
σ = 177.41 nV/°C
35
20
C013
C013
σ–IN = 154.946 pA
σ+IN = 152.739 pA
µ = 0.112 pA
N = 90
σ = 15.023 pA
N = 90
Figure 4. Input Offset Current Production Distribution
Figure 3. Input Bias Current Production Distribution
400
120
300
Input Offset Voltage ( V)
Input-referred Offset Voltage ( V)
0.5
C001
C002
Figure 1. Offset Voltage Production Distribution
200
100
0
±100
±200
80
40
0
±40
±80
±300
VCM = 16.5 V
VCM = ± 16.5 V
±400
±120
±75
±50
±25
0
25
50
75
100
125
Temperature (ƒC)
150
C001
±20
±15
±10
0
5
10
15
20
C003
5 typical units
Figure 5. Offset Voltage vs Temperature
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±5
Input Common-mode Voltage (V)
5 typical units
12
0
-1
200
150
50
0
-50
-100
-150
-200
100
Input Offset Voltage Drift (µV/ƒC)
Input Offset Voltage (µV)
µ = –3.56 µV
-0.5
0
0
Figure 6. Offset Voltage vs Common-Mode Voltage
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Typical Characteristics (continued)
at TA = 25°C, VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF (unless otherwise noted)
150
120
VS = 4.5 V
100
Gain (dB)
50
0
±100
±150
0
9
18
27
120
60
90
60
Phase
20
30
0
0
±20
36
Supply Voltage (V)
80
40
±50
150
1
10
100
Phase (ƒ)
Input Offset Voltage ( V)
100
180
Magnitude
1k
10k
100k
1M
-30
10M
Frequency (Hz)
C001
C022
5 typical units
Figure 7. Offset Voltage vs Supply Voltage
Figure 8. Open-Loop Gain and Phase vs Frequency
25
40
Gain (dB)
20
Normalized Input Bias Current (pA)
G = +1
G= -1
G= +10
0
-20
-40
100
1k
10k
100k
1M
15
10
5
0
±5
±10
±15
±20
±25
10M
Frequency (Hz)
20
±20
±15
±10
±5
0
5
Figure 9. Closed-Loop Gain vs Frequency
15
20
C001
Figure 10. Input Bias Current vs Common-Mode Voltage
10V
1.0
Output Saturation Voltage (V)
125°C
0.8
Input Current (nA)
10
Input Common-mode Voltage (V)
C004
0.5
IBN
0.3
0.0
IBP
±0.3
85°C
25°C
-40°C
1V
IOS
100mV
±0.5
±75
±50
±25
0
25
50
75
Temperature (ƒC)
100
125
150
1
Figure 11. Input Bias Current and Offset vs Temperature
10
Output Current (mA)
C001
100
C019
Figure 12. Output Voltage Swing vs Output Current
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Typical Characteristics (continued)
18
-14
17.5
-14.5
17
Output Voltage (V)
Output Voltage (V)
at TA = 25°C, VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF (unless otherwise noted)
16.5
16
15.5
15
25°C
85°C
14.5
125°C
-15
±40°C
-16.5
-17
-17.5
±40°C
5
10
15
20
25
30
35
40
45
0
50
Output Current (mA)
5
10
15
20
25
30
35
40
45
Common-Mode Rejection Ratio (dB)
+PSRR
120
±PSRR
100
80
60
40
20
0.01
150
140
0.1
130
1
120
110
100
0
1
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
130
1
±50
±25
0
25
50
75
100
125
Temperature (ƒC)
75
100 125 150
C001
Time (1 s/div)
150
C017
C001
Figure 17. PSRR vs Temperature
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50
Input-referred Voltage Noise (50 nV/div)
0.1
Power Supply Rejection Ratio (µV/V)
150
120
25
Figure 16. CMRR vs Temperature
0.01
140
0
Temperature (ƒC)
Figure 15. CMRR and PSRR vs Frequency
±75
10
±75 ±50 ±25
C004
160
Common-mode Rejection Ratio (µV/V)
160
140
C001
Figure 14. Output Voltage Swing vs Output Current
(Sinking)
160
CMRR
50
Output Current (mA)
C001
Figure 13. Output Voltage Swing vs Output Current
(Sourcing)
Rejection Ratio (dB)
125°C
-18
0
Power Supply Rejection Ratio (dB)
25°C
-16
14
14
85°C
-15.5
Figure 18. 0.1-Hz to 10-Hz Voltage Noise
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Typical Characteristics (continued)
100
100
10
10
Voltage Noise
Current Noise
1
10m
100m
1
10
100
1k
Frequency (Hz)
10k
1
1M
100k
Total Harmonic Distortion + Noise (%)
1000
1
-40
G = -1, 2-k Load
G = -1, 600- Load
G = -1, 10-k Load
G = +1, 2-k Load
G = +1, 600- Load
G = +1, 10-k Load
0.1
0.01
-60
-80
0.001
-100
0.0001
-120
0.00001
20
200
-140
20k
2k
Frequency (Hz)
VOUT = 3.5 VRMS
700
0.01
-80
0.001
-100
0.0001
0.00001
0.001
G = -1, 600- Load
G = -1, 2-k Load
G = -1, 10-k Load
G = +1, 600- Load
G = +1, 2-k Load
G = +1, 10-k Load
0.01
0.1
-120
-140
1
500
400
300
100
0
0
9
18
27
36
Supply Voltage (V)
C004
C001
BW = 90 kHz
Figure 21. THD+N vs Output Amplitude
Figure 22. Quiescent Current vs Supply Voltage
1000
180
900
0.001
170
800
700
Open-loop Gain (dB)
VS = ± 18 V
600
500
VS = ± 2.25 V
400
300
200
160
0.01
VS = ± 18 V
150
140
0.1
130
VS = ± 2.25 V
120
1
Open-loop Gain (µV/V)
Quiescent Current (µA)
VS = 4.5 V
200
10
Output Amplitude (VRMS)
f = 1 kHz
600
Quiescent Current (µA)
-60
0.1
C004
BW = 90 kHz
Figure 20. THD+N Ratio vs Frequency
Total Harmonic Distortion + Noise (dB)
Total Harmonic Distortion + Noise (%)
Figure 19. Input Voltage Noise and Current Noise Spectral
Density vs Frequency
Total Harmonic Distortion + Noise (dB)
Voltage Noise Spectral Density (nV/—Hz)
1000
Current Noise Spectral Density (fA/—Hz)
at TA = 25°C, VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF (unless otherwise noted)
110
100
100
0
±75
±50
±25
0
25
50
75
100
125
Temperature (ƒC)
Figure 23. Quiescent Current vs Temperature
150
10
±50
±25
0
25
50
75
100
125
150
Temperature (ƒC)
C001
C001
Figure 24. Open-Loop Gain vs Temperature
(With 10-kΩ Load)
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Typical Characteristics (continued)
at TA = 25°C, VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF (unless otherwise noted)
140
DC Open-loop Gain (dB)
DC Open-loop Gain (dB)
140
120
100
80
60
120
100
80
60
40
0
0.5
1
1.5
2
Output Voltage Swing from Rail (V)
0
0.5
VS = ±18 V
C001
Figure 26. Open-Loop Gain vs Output Voltage Swing to
Supply
1k
50
G = -1, RISO = 0
G = -1, RISO = 25
G = -1, RISO = 50
G = +1, RISO = 0
G = +1, RISO = 25
G = +1, RISO = 50
45
Overshoot (%)
40
100
35
30
25
20
15
10
5
10
0
1
10
100
1k
10k
100k
1M
Frequency (Hz)
10M
100M
25
250
2500
Capacitive Load (pF)
C021
Unity-gain bandwidth = 1 MHz
25000
C004
10-mV step
Output Voltage (5 V/div)
Figure 27. Open-Loop Output Impedance vs Frequency
Figure 28. Small-Signal Overshoot vs Capacitive Load
VOUT
5 V/div
VIN
Time (1 ms/div)
Time (2 µs/div)
C017
C017
Figure 29. No Phase Reversal
16
1.5
VS = ±2.25 V
Figure 25. Open-Loop Gain vs Output Voltage
Swing to Supply
Open-loop Output Impedance (Ÿ)
1
Output Voltage Swing from Rail (V)
C001
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Figure 30. Positive Overload Recovery
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Typical Characteristics (continued)
at TA = 25°C, VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF (unless otherwise noted)
5 V/div
2.5 mV/div
VIN
VOUT
Input
Output
Time (25 µs/div)
Time (2 µs/div)
C017
C017
G = +1
Figure 32. Small-Signal Step Response (10-mV Step)
2 V/div
2.5 mV/div
Figure 31. Negative Overload Recovery
Output
Input
Output
Input
Time (10 µs/div)
Time (25 µs/div)
C017
C017
G = –1
G = –1
Figure 33. Small-Signal Step Response (10-mV Step)
10-V step
Figure 34. Large-Signal Step Response
2 V/div
1 mV/div
.01% Settling = “1 mV
Output
Input
Time (10 µs/div)
Time (5 µs/div)
C017
G = +1
C017
10-V step
10-V step
Figure 35. Large-Signal Step Response
Figure 36. Settling Time
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Typical Characteristics (continued)
at TA = 25°C, VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF (unless otherwise noted)
50
40
Maximum output voltage without
slew-rate induced distortion.
35
40
Output Voltage (VPP)
Short Circuit Current (mA)
Sinking
30
Sourcing
20
VS = ±18 V
30
25
20
15
10
10
VS = ±2.25 V
5
0
0
±75
±50
±25
0
25
50
75
100
125
100
150
Temperature (ƒC)
1k
10k
Frequency (Hz)
C001
Figure 37. Short-Circuit Current vs Temperature
100k
1M
C001
Figure 38. Maximum Output Voltage Amplitude vs
Frequency
100
EMIRR IN+ (dB)
80
60
40
20
0
10M
100M
1000M
Frequency (Hz)
C004
PRF = –10 dBm
Figure 39. EMIRR vs Frequency
18
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7 Detailed Description
7.1 Overview
The OPA202, OPA2202, and OPA4202 (OPAx202) family of devices is a series of low-power, super-beta, bipolar
junction transistor (super-β BJT), input amplifiers that features superior drift performance and low input bias
current. The low output impedance and heavy capacitive load drive abilities allow designers to interface to
modern, fast-acquisition, precision analog-to-digital converters (ADCs) and buffer precision voltage references
and drive power supply decoupling capacitors. The OPAx202 achieve a 1-MHz gain-bandwidth product and a
0.35-V/μs slew rate, and consumes only 580 µA (typical) of quiescent current, making the devices a great choice
for low-power applications. These devices operate on a single 4.5-V to 36-V supply, or dual ±2.25-V to ±18-V
supplies.
All versions are fully specified from –40°C to +105°C for use in the most challenging environments. The singlechannel OPA202 is available in 8-pin SOIC, 8-pin VSSOP, and 5-pin SOT-23 packages. The dual-channel
OPA2202 is available in an 8-pin VSSOP package. The quad-channel OPA4202 is available in 14-pin SOIC and
TSSOP packages.
The Functional Block Diagram shows the simplified diagram of the OPAx202.
7.2 Functional Block Diagram
V+
gm1
+IN
OUT
±IN
V±
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7.3 Feature Description
7.3.1 Capacitive Load and Stability
The dynamic characteristics of the OPAx202 are optimized for commonly encountered gains, loads, and
operating conditions. The OPAx202 feature a patented output stage capable of driving large capacitive loads. In
a unity-gain configuration, the series is capable of directly driving to 25 nF of pure capacitive load. Increase the
gain to enhance the ability of the devices to drive greater capacitive loads. The particular op amp circuit
configuration, layout, gain, and output loading are some of the factors to consider when establishing whether an
amplifier is stable in operation.
The combination of low closed-loop gain and high capacitive loads decreases the phase margin of the amplifier,
and can lead to gain peaking or oscillations. As a result, heavier capacitive loads must be isolated from the
output. Add a small resistor (ROUT equal to 50 Ω, for example) in series with the output to achieve isolation.
Figure 40 shows the effects on small-signal overshoot for several capacitive loads and combinations of isolation
resistance. See the Feedback Plots Define Op Amp AC Performance application bulletin for details of analysis
techniques and application circuits, available for download from the www.TI.com. By using isolation resistors,
driving capacitive loads of 100 nF and beyond is possible.
50
G = -1, RISO = 0
G = -1, RISO = 25
G = -1, RISO = 50
G = +1, RISO = 0
G = +1, RISO = 25
G = +1, RISO = 50
45
Overshoot (%)
40
35
30
25
20
15
10
5
0
25
250
2500
25000
Capacitive Load (pF)
C004
Figure 40. Small-Signal Overshoot vs Capacitive Load (10-mV Output Step)
20
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Feature Description (continued)
For additional drive capability in unity-gain configurations, insert a small (10 Ω to 20 Ω) resistor (RISO) in series
with the output to improve capacitive load drive, as shown in Figure 41. This resistor reduces ringing and
maintains dc performance for purely capacitive loads. However, if a resistive load is in parallel with the capacitive
load, then a voltage divider is created, which introduces a gain error at the output and reduces the output swing.
The error is proportional to the ratio RISO / RL, and is generally negligible at low output levels. A high capacitive
load drive makes the OPAx202 a great choice for applications such as reference buffers, MOSFET gate drives,
and cable-shield drives. The circuit shown in Figure 41 uses an isolation resistor (RISO) to stabilize the output of
an op amp. RISO modifies the open-loop gain of the system for increased phase margin. Table 2 lists the results
using the OPAx202. For additional information on techniques to optimize and design using this circuit, TI
Precision Design TIPD128 details complete design goals, simulation, and test results.
+Vs
Vout
Riso
+
Vin
Cload
+
±
-Vs
Figure 41. Extending Capacitive Load Drive With the OPAx202
Table 2. OPAx202 Capacitive Load Drive Solution Using Isolation Resistor Measured Results
MEASURED OVERSHOOT (%)
PARAMETER
INVERTING CONFIGURATION
NONINVERTING CONFIGURATION
CLOAD (pF)
RISO = 0 Ω
RISO = 25 Ω
RISO = 50 Ω
RISO = 0 Ω
RISO = 25 Ω
RISO = 50 Ω
31
8.6
6.6
6.6
9.3
9
9.4
251
6.7
6.4
6.7
8.9
8.9
8.9
421
6.4
6.3
6.6
8.8
8.8
8.7
641
6.7
6.3
6.5
8.1
8.8
8.5
1079
6.1
6.1
6.4
8.6
8.7
9.8
1539
6.4
6.3
6.1
8.9
10.3
10.1
2579
6.1
6.3
6.9
16
13.3
12
3949
8.1
7.9
8.3
25
16
14.1
6269
14.9
10.8
9.9
33.1
18.1
14.5
10139
21.8
13.5
10.8
40.2
19.1
15.4
15729
29.4
15.2
11.6
46.2
19.6
14.5
25069
37
16.5
12.3
52.6
19.2
13.9
For step-by-step design procedure, circuit schematics, bill of materials, printed circuit board (PCB) files, simulation results, and test results,
see TIPD128, Capacitive Load Drive Solution Using an Isolation Resistor verified reference design.
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7.3.2 Output Current Limit
The output current of the OPAx202 is limited by internal circuitry to ±35 mA (sinking or sourcing) to protect the
device if the output is accidentally shorted. This short-circuit current depends on temperature, as Figure 37
shows.
7.3.3 Noise Performance
Figure 42 shows the total circuit noise for varying source impedances with the operational amplifier in a unitygain configuration (with no feedback resistor network and therefore no additional noise contributions). The
OPAx202 and OPA211 are shown with total circuit noise calculated. The op amp itself contributes a voltage
noise component and a current noise component. The voltage noise is commonly modeled as a time-varying
component of the offset voltage. The current noise is modeled as the time-varying component of the input bias
current and reacts with the source resistance to create a voltage component of noise. Therefore, the lowest noise
op amp for a given application depends on the source impedance. For low source impedance, current noise is
negligible and voltage noise dominates. The OPAx202 have both low voltage noise and low current noise
because of the super-beta bipolar junction transistor (super-β BJT) input of the op amp. As a result, the current
noise contribution of the OPAx202 is negligible for most practical source impedances, which makes the series
the better choice for applications with high source impedance.
The equation in Figure 42 shows the calculation of the total circuit noise with these parameters:
• en = voltage noise
• In = current noise
• RS = source impedance
• k = Boltzmann's constant = 1.38 × 10–23 J/K
• T = temperature in kelvins (K)
Voltage Noise Spectral Density, EO (V/Hz1/2)
For more details on calculating noise, see Basic Noise Calculations.
10µ
OPA211
1µ
100n
OPA202
10n
1n
RS = 6 kŸ
Resistor Noise
0.1n
1
10
100
1k
10k
100k
1M
Source Resistance, RS (Ÿ)
10M
C003
NOTE: For source resistances (RS) greater than 6 kΩ, the OPAx202 is a lower-noise option compared to the
OPA211, as shown in Figure 42.
Figure 42. Noise Performance of the OPAx202 vs the OPA211 in a Unity-Gain Buffer Configuration
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7.3.4 Phase-Reversal Protection
The OPAx202 family has internal phase-reversal protection. Many FET- and bipolar-input op amps exhibit a
phase reversal when the input is driven beyond its linear common-mode range. This condition is most often
encountered in noninverting circuits when the input is driven beyond the specified common-mode voltage range,
causing the output to reverse into the opposite rail. The input circuitry of the OPAx202 prevents phase reversal
with excessive common-mode voltage; instead, the output limits into the appropriate rail (see Figure 29).
7.3.5 Thermal Protection
The OPAx202 family of op amps is capable of driving 2-kΩ loads with power-supply voltages of up to ±18 V
across the specified temperature range. In a single-supply configuration, where the load is connected to the
negative supply voltage, the minimum load resistance is 1.1 kΩ at a supply voltage of 36 V. For lower supply
voltages (either single-supply or symmetrical supplies), a lower load resistance may be used as long as the
output current does not exceed 35 mA; otherwise, the device short-circuit current protection circuit may activate.
Internal power dissipation increases when operating at high supply voltages. Copper leadframe construction
used in the OPAx202 devices improves heat dissipation. Printed-circuit-board (PCB) layout helps reduce a
possible increase in junction temperature. Wide copper traces help dissipate the heat by acting as an additional
heat sink. An increase in temperature is further minimized by soldering the devices directly to the PCB rather
than using a socket.
Although the output current is limited by internal protection circuitry, accidental shorting of one or more output
channels of a device can result in excessive heating. For instance, when an output is shorted to midsupply, the
typical short-circuit current of 35 mA leads to an internal power dissipation of over 600 mW at a supply of ±18 V.
To prevent excessive heating, the OPAx202 have an internal thermal shutdown circuit that shuts down the
device if the die temperature exceeds approximately 135°C. When this thermal shutdown circuit activates, a builtin hysteresis of 10°C makes sure that the die temperature drops to approximately 125°C before the device
switches on again. Additional consideration must be given to the combination of maximum operating voltage,
maximum operating temperature, load, and package type.
7.3.6 Electrical Overstress
Designers often ask questions about the capability of an operational amplifier to withstand electrical overstress.
These questions tend to focus on the device inputs, but may involve the supply voltage pins or even the output
pin. Each of these different pin functions have electrical stress limits determined by the voltage breakdown
characteristics of the particular semiconductor fabrication process and specific circuits connected to the pin.
Additionally, internal electrostatic discharge (ESD) protection is built into these circuits to protect them from
accidental ESD events both before and during product assembly.
It is helpful to have a good understanding of this basic ESD circuitry and the relevance to an electrical overstress
event. See Figure 43 for an illustration of the ESD circuits contained in the OPAx202 (indicated by the dashed
line area). The ESD protection circuitry involves several current-steering diodes connected from the input and
output pins and routed back to the internal power-supply lines, where they meet at an absorption device internal
to the operational amplifier. This protection circuitry is intended to remain inactive during normal circuit operation.
An ESD event produces a short duration, high-voltage pulse that is transformed into a short duration, highcurrent pulse as the pulse discharges through a semiconductor device. The ESD protection circuits are designed
to provide a current path around the operational amplifier core to protect the core from damage. The energy
absorbed by the protection circuitry is then dissipated as heat.
When an ESD voltage develops across two or more of the amplifier device pins, current flows through one or
more of the steering diodes. Depending on the path that the current takes, the absorption device may activate.
The absorption device has a trigger, or threshold voltage, that is above the normal operating voltage of the
OPAx202 but below the device breakdown voltage level. Once this threshold is exceeded, the absorption device
quickly activates and clamps the voltage across the supply rails to a safe level.
When the operational amplifier connects into a circuit (such as the one Figure 43 shows), the ESD protection
components are intended to remain inactive and not become involved in the application circuit operation.
However, circumstances may arise where an applied voltage exceeds the operating voltage range of a given pin.
If this condition occurs, there is a risk that some of the internal ESD protection circuits may be biased on and
conduct current. Any such current flow occurs through steering diode paths and rarely involves the absorption
device.
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Figure 43 shows a specific example where the input voltage, VIN, exceeds the positive supply voltage (+VS) by
500 mV or more. Much of what happens in the circuit depends on the supply characteristics. If +VS can sink the
current, one of the upper input steering diodes conducts and directs current to +VS. Excessively high current
levels can flow with increasingly higher VIN. As a result, the data sheet specifications recommend that
applications limit the input current to 10 mA.
If the supply is not capable of sinking the current, VIN may begin sourcing current to the operational amplifier, and
then take over as the source of positive supply voltage. The danger in this case is that the voltage can rise to
levels that exceed the operational amplifier absolute maximum ratings.
Another common question involves what happens to the amplifier if an input signal is applied to the input while
the power supplies +VS or –VS are at 0 V.
It depends on the supply characteristic while at 0 V, or at a level below the input signal amplitude. If the supplies
appear as high impedance, then the operational amplifier supply current may be supplied by the input source
through the current steering diodes. This state is not a normal bias condition; the amplifier most likely does not
operate normally. If the supplies are low impedance, then the current through the steering diodes can become
quite high. The current level depends on the ability of the input source to deliver current, and any resistance in
the input path.
If there is an uncertainty about the ability of the supply to absorb this current, external Zener diodes may be
added to the supply pins as shown in Figure 43. The Zener voltage must be selected such that the diode does
not turn on during normal operation.
However, the Zener voltage must be low enough so that the Zener diode conducts if the supply pin rises above
the safe operating supply voltage level.
(2)
TVS
RF
V+
RI
RS
IN
(3)
+IN
+VS
100
100
ESD CurrentSteering Diodes
Op Amp
Core
Edge-Triggered ESD
Absorption Circuit
ID
VIN
OUT
RL
(1)
V±
VS
(2)
TVS
Copyright © 2017, Texas Instruments Incorporated
(1)
VIN = +VS + 500 mV.
(2)
TVS: +VS(max) > VTVSBR (Min) > +VS
(3)
Suggested value is approximately 5 kΩ in overvoltage conditions.
Figure 43. Equivalent Internal ESD Circuitry in a Typical Application Circuit
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7.3.7 EMI Rejection
The electromagnetic interference (EMI) rejection ratio, or EMIRR, describes the EMI immunity of operational
amplifiers. An adverse effect that is common to many op amps is a change in the offset voltage as a result of RF
signal rectification. An op amp that is more efficient at rejecting this change in offset as a result of EMI has a
higher EMIRR and is quantified by a decibel value. Measuring EMIRR is performed in many ways, but this
section provides the EMIRR IN+, which specifically describes the EMIRR performance when the RF signal is
applied to the noninverting input pin of the op amp. In general, only the noninverting input is tested for EMIRR for
the following three reasons:
• Op amp input pins are known to be the most sensitive to EMI, and typically rectify RF signals better than the
supply or output pins.
• The noninverting and inverting op amp inputs have symmetrical physical layouts and exhibit matching EMIRR
performance
• EMIRR is easier to measure on noninverting pins than on other pins because the noninverting input pin can
be isolated on a PCB. This isolation allows the RF signal to be applied directly to the noninverting input pin
with no complex interactions from other components or connecting PCB traces.
High-frequency signals conducted or radiated to any pin of the operational amplifier may result in adverse
effects, as the amplifier does not have sufficient loop gain to correct for signals with spectral content outside
the bandwidth. Conducted or radiated EMI on inputs, power supply, or output may result in unexpected DC
offsets, transient voltages, or other unknown behavior. Take care to properly shield and isolate sensitive
analog nodes from noisy radio signals and digital clocks and interfaces. shows the effect of conducted EMI to
the power supplies on the input offset voltage of OPAx202.
The EMIRR IN+ of the OPAx202 is plotted versus frequency, as shown in Figure 44. If available, any dual
and quad op-amp device versions have similar EMIRR IN+ performance. The OPAx202 unity-gain bandwidth
is 1 MHz. EMIRR performance less than this frequency denotes interfering signals that fall within the op-amp
bandwidth.
See the EMI Rejection Ratio of Operational Amplifiers application report, available for download from
www.ti.com.
100
EMIRR IN+ (dB)
80
60
40
20
0
10M
100M
1000M
Frequency (Hz)
C004
Figure 44. OPAx202 EMIRR IN+
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Table 3 lists the EMIRR IN+ values for the OPAx202 at particular frequencies commonly encountered in realworld applications. Table 3 lists applications that may be centered on or operated near the particular frequency
shown. This information may be of special interest to designers working with these types of applications, or
working in other fields likely to encounter RF interference from broad sources, such as the industrial, scientific,
and medical (ISM) radio band.
Table 3. OPAx202 EMIRR IN+ for Frequencies of Interest
FREQUENCY
APPLICATION OR ALLOCATION
EMIRR IN+
400 MHz
Mobile radio, mobile satellite, space operation, weather, radar, ultra-high frequency (UHF)
applications
41 dB
900 MHz
Global system for mobile communications (GSM) applications, radio communication, navigation,
GPS (to 1.6 GHz), GSM, aeronautical mobile, UHF applications
47 dB
1.8 GHz
GSM applications, mobile personal communications, broadband, satellite, L-band (1 GHz to 2 GHz)
54 dB
2.4 GHz
802.11b, 802.11g, 802.11n, Bluetooth®, mobile personal communications, industrial, scientific and
medical (ISM) radio band, amateur radio and satellite, S-band (2 GHz to 4 GHz)
67 dB
3.6 GHz
Radiolocation, aero communication and navigation, satellite, mobile, S-band
67 dB
802.11a, 802.11n, aero communication and navigation, mobile communication, space and satellite
operation, C-band (4 GHz to 8 GHz)
81 dB
5 GHz
7.3.8 EMIRR +IN Test Configuration
Figure 45 shows the circuit configuration for testing the EMIRR IN+. An RF source is connected to the op amp
noninverting input pin using a transmission line. The op amp is configured in a unity-gain buffer topology with the
output connected to a low-pass filter (LPF) and a digital multimeter (DMM). A large impedance mismatch at the
op amp input causes a voltage reflection; however, this effect is characterized and accounted for when
determining the EMIRR IN+. The resulting DC offset voltage is sampled and measured by the multimeter. The
LPF isolates the multimeter from residual RF signals that may interfere with multimeter accuracy.
Ambient temperature: 25Û&
+VS
±
50
Low-Pass Filter
+
RF source
DC Bias: 0 V
Modulation: None (CW)
Frequency Sweep: 201 pt. Log
-VS
Sample /
Averaging
Not shown: 0.1 µF and 10 µF
supply decoupling
Digital Multimeter
Figure 45. EMIRR +IN Test Configuration
7.4 Device Functional Modes
The OPAx202 have a single functional mode and are operational when the power-supply voltage is greater than
4.5 V (±2.25 V). The maximum power supply voltage for the OPAx202 is 36 V (±18 V).
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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 OPA202, OPA2202, and OPA4202 (OPAx202) are unity-gain stable operational amplifiers with low noise,
low input bias current, and low input offset voltage. Applications with noisy or high-impedance power supplies
require decoupling capacitors placed close to the device pins. In most cases, 0.1-µF capacitors are adequate.
Designers can use the low output impedance and heavy capacitive load drive abilities to interface to modern,
fast-acquisition, precision analog-to-digital converters (ADCs) and buffer precision voltage references and drive
power supply decoupling capacitors.
8.1.1 Basic Noise Calculations
Low-noise circuit design requires careful analysis of all noise sources. External noise sources dominates in many
cases; consider the effect of source resistance on overall op amp noise performance. Total noise of the circuit is
the root-sum-square combination of all noise components.
The resistive portion of the source impedance produces thermal noise proportional to the square root of the
resistance. Figure 42 shows this function. The source impedance is usually fixed; consequently, select the op
amp and the feedback resistors to minimize the respective contributions to the total noise.
Figure 46 shows noninverting (A) and inverting (B) op amp circuit configurations with gain. In circuit
configurations with gain, the feedback network resistors contribute noise. Typically, the current noise of the op
amp reacts with the feedback resistors to create additional noise components. However, the extremely low
current noise of the OPAx202 means that the current noise contribution is neglected.
The feedback resistor values are typically selected to make these noise sources negligible. Low impedance
feedback resistors load the output of the amplifier. The equations for total noise are shown for both
configurations.
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Application Information (continued)
(A) Noise in Noninverting Gain Configuration
R1
Noise at the output is given as EO, where
R2
GND
±
EO
+
RS
+
±
VS
Source
GND
'1 = l1 +
:2;
A5 = ¥4 „ G$ „ 6(-) „ 45
d
:3;
A41 æ42 = ¨4 „ G$ „ 6(-) „ d
8
41 „ 42
h d
h
41 + 42
¾*V
Thermal noise of R1 || R2
:4;
G$ = 1.38065 „ 10F23
Boltzmann Constant
:5;
,
h
-
6(-) = 237.15 + 6(°%)
(B) Noise in Inverting Gain Configuration
R1
RS
R2
h
Thermal noise of RS
>-?
Temperature in kelvins
:45 + 41 ; „ 42
42
2
p „ ¨:A0 ;2 + kA41 +45 æ42 o + FE0 „ H
IG
45 + 41
45 + 41 + 42
:6;
'1 = l1 +
+
:7;
:45 + 41 ; „ 42
8
I d
A41 +45 æ42 = ¨4 „ G$ „ 6(-) „ H
h
45 + 41 + 42
¾*V Thermal noise of (R1 + RS) || R2
GND
:8;
G$ = 1.38065 „ 10F23
:9;
6(-) = 237.15 + 6(°%)
±
+
±
d
8
¾*V
> 84/5 ?
Noise at the output is given as EO, where
EO
VS
42
41 „ 42 2
2
p „ ¨:A5 ;2 + :A0 ;2 + kA41 æ42 o + :E0 „ 45 ;2 + lE0 „ d
hp
41
41 + 42
:1;
Source
GND
d
,
h
-
2
> 84/5 ?
Boltzmann Constant
>-?
Temperature in kelvins
Copyright © 2017, Texas Instruments Incorporated
(1)
eN = the voltage noise of the amplifier = 9 nV/√Hz at 1 kHz.
(2)
iN = the current noise of the amplifier = 76 fA/√Hz at 1 kHz.
(3)
For additional resources on noise calculations, visit TI's Precision Labs.
Figure 46. Noise Calculation in Gain Configurations
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8.2 Typical Application
R4
2.94 k
C5
1 nF
R1
590
R3
499
Input
C2
39 nF
±
Output
+
OPA202
Copyright © 2017, Texas Instruments Incorporated
Figure 47. 25-kHz, Low-Pass Filter
8.2.1 Design Requirements
Low-pass filters are used in signal processing applications to reduce noise and prevent aliasing. The OPAx202
devices are is designed to construct high-speed, high-precision active filters. Figure 47 shows a second-order,
low-pass filter commonly encountered in signal processing applications.
Use the following parameters for this design example:
• Gain = 5 V/V (inverting gain)
• Low-pass cutoff frequency = 25 kHz
• Second-order Chebyshev filter response with 3-dB gain peaking in the passband
8.2.2 Detailed Design Procedure
The infinite-gain multiple-feedback circuit for a low-pass network function is shown in Figure 47. Use Equation 1
to calculate the voltage transfer function.
1 R1R3C2C5
Output
s
2
Input
s
s C2 1 R1 1 R3 1 R4 1 R3R4C2C5
(1)
This circuit produces a signal inversion. For this circuit, the gain at DC and the low-pass cutoff frequency are
calculated by Equation 2:
R4
Gain
R1
fC
1
2S
1 R3R 4 C2C5
(2)
Software tools are readily available to simplify filter design. WEBENCH® Filter Designer is a simple, powerful,
and easy-to-use active filter design program. The WEBENCH® Filter Designer lets you create optimized filter
designs using a selection of TI operational amplifiers and passive components from TI's vendor partners.
Available as a web based tool from the WEBENCH Design Center, WEBENCH Filter Designer allows you to
design, optimize, and simulate complete multistage active filter solutions within minutes.
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Typical Application (continued)
8.2.3 Application Curve
20
Gain (db)
0
-20
-40
-60
100
1k
10k
Frequency (Hz)
100k
1M
Figure 48. OPAx202 Second-Order, 25-kHz, Chebyshev, Low-Pass Filter
9 Power Supply Recommendations
The OPAx202 are specified for operation from 4.5 V to 36 V (±2.25 V to ±18 V); many specifications apply from
–40°C to +105°C. Parameters that can exhibit significant variance with regard to operating voltage or
temperature are shown in the Typical Characteristics.
CAUTION
Supply voltages greater than 40 V can permanently damage the device; see the
Absolute Maximum Ratings.
Place 0.1-μF bypass capacitors close to the power-supply pins to reduce errors coupling in from noisy or highimpedance power supplies. For more detailed information on bypass capacitor placement, see the Layout
section.
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10 Layout
10.1 Layout Guidelines
For best operational performance of the device, use good PCB layout practices, including:
• Noise can propagate into analog circuitry through the power pins of the circuit as a whole and the op amp
itself. Bypass capacitors are used to reduce the coupled noise by providing low-impedance power
sources local to the analog circuitry.
– Connect low-ESR, 0.1-µF ceramic bypass capacitors between each supply pin and ground, placed as
close as possible to the device. A single bypass capacitor from V+ to ground is applicable for singlesupply applications.
• Separate grounding for analog and digital portions of circuitry is one of the simplest and most effective
methods of noise suppression. One or more layers on multilayer PCBs are usually devoted to ground
planes. A ground plane helps distribute heat and reduces EMI noise pickup. Make sure to physically
separate digital and analog grounds paying attention to the flow of the ground current. For more detailed
information, see The PCB is a component of op amp design.
• To reduce parasitic coupling, run the input traces as far away as possible from the supply or output
traces. If these traces cannot be kept separate, crossing the sensitive trace perpendicular is much better
as opposed to in parallel with the noisy trace.
• Place the external components as close as possible to the device. As shown in Figure 49, keeping RF
and RG close to the inverting input minimizes parasitic capacitance.
• Keep the length of input traces as short as possible. Always remember that the input traces are the most
sensitive part of the circuit.
• Consider a driven, low-impedance guard ring around the critical traces. A guard ring can significantly
reduce leakage currents from nearby traces that are at different potentials.
• For best performance, TI recommends cleaning the PCB following board assembly.
• Any precision integrated circuit may experience performance shifts due to moisture ingress into the
plastic package. Following any aqueous PCB cleaning process, TI recommends baking the PCB
assembly to remove moisture introduced into the device packaging during the cleaning process. A low
temperature, post cleaning bake at 85°C for 30 minutes is sufficient for most circumstances.
10.2 Layout Example
GND
+V
R3
Use ground pours for
shielding the input
signal pairs
Place bypass
capacitors as close to
device as possible
(avoid use of vias)
C3
C4
C3
R3
IN±
1
NC
NC
C4
8
IN±
IN+
1
NC
NC
8
2
±IN
V+
7
3
+IN
OUT
6
4
V±
NC
5
+V
R1
R1
2
±IN
±
V+
7
3
+IN
+
OUT
6
R2
4
V±
NC
5
OUT
OUT
R2
-V
C1
IN+
R4
GND
R4
C2
Place components
close to device and to
each other to reduce
parasitic errors
C1
-V
Use a lowESR,ceramic bypass
capacitor
C2
Copyright © 2017, Texas Instruments Incorporated
Figure 49. Operational Amplifier Board Layout for Difference Amplifier Configuration
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11 Device and Documentation Support
11.1 Device Support
11.1.1 Development Support
11.1.1.1 TINA-TI™ (Free Software Download)
TINA™ is a simple, powerful, and easy-to-use circuit simulation program based on a SPICE engine. TINA-TI is a
free, fully functional version of the TINA software, preloaded with a library of macro models in addition to a range
of both passive and active models. TINA-TI provides all the conventional dc, transient, and frequency domain
analysis of SPICE, as well as additional design capabilities.
Available as a free download from the Analog eLab Design Center, TINA-TI offers extensive post-processing
capability that allows users to format results in a variety of ways. Virtual instruments offer the ability to select
input waveforms and probe circuit nodes, voltages, and waveforms, creating a dynamic quick-start tool.
NOTE
These files require that either the TINA software (from DesignSoft™) or TINA-TI software
be installed. Download the free TINA-TI software from the TINA-TI folder.
11.1.1.2 WEBENCH Filter Designer Tool
WEBENCH® Filter Designer is a simple, powerful, and easy-to-use active filter design program. The WEBENCH
Filter Designer lets you create optimized filter designs using a selection of TI operational amplifiers and passive
components from TI's vendor partners.
11.1.1.3 TI Precision Designs
TI Precision Designs are available online at http://www.ti.com/ww/en/analog/precision-designs/. TI Precision
Designs are analog solutions created by TI’s precision analog applications experts and offer the theory of
operation, component selection, simulation, complete PCB schematic and layout, bill of materials, and measured
performance of many useful circuits.
11.2 Documentation Support
11.2.1 Related Documentation
For related documentation see the following:
• Texas Instruments, The PCB is a component of op amp design
• Texas Instruments, Compensate Transimpedance Amplifiers Intuitively
• Texas Instruments, Operational amplifier gain stability, Part 3: AC gain-error analysis
• Texas Instruments, Operational amplifier gain stability, Part 2: DC gain-error analysis
• Texas Instruments, Using infinite-gain, MFB filter topology in fully differential active filters
• Texas Instruments, Op Amp Performance Analysis
• Texas Instruments, Single-Supply Operation of Operational Amplifiers
• Texas Instruments, Tuning in Amplifiers
• Texas Instruments, Shelf-Life Evaluation of Lead-Free Component Finishes
• Texas Instruments, Feedback Plots Define Op Amp AC Performance
• Texas Instruments, EMI Rejection Ratio of Operational Amplifiers
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11.3 Related Links
Table 4 lists quick access links. Categories include technical documents, support and community resources,
tools and software, and quick access to order now.
Table 4. Related Links
PARTS
PRODUCT FOLDER
ORDER NOW
TECHNICAL
DOCUMENTS
TOOLS &
SOFTWARE
SUPPORT &
COMMUNITY
OPA202
Click here
Click here
Click here
Click here
Click here
OPA2202
Click here
Click here
Click here
Click here
Click here
OPA4202
Click here
Click here
Click here
Click here
Click here
11.4 Receiving Notification of Documentation Updates
To receive notification of documentation updates, navigate to the device product folder on ti.com. In the upper
right corner, click on Alert me to register and receive a weekly digest of any product information that has
changed. For change details, review the revision history included in any revised document.
11.5 Support Resources
TI E2E™ support forums are an engineer's go-to source for fast, verified answers and design help — straight
from the experts. Search existing answers or ask your own question to get the quick design help you need.
Linked content is 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.
11.6 Trademarks
E2E is a trademark of Texas Instruments.
TINA-TI is a trademark of Texas Instruments, Inc and DesignSoft, Inc.
WEBENCH is a registered trademark of Texas Instruments.
Bluetooth is a registered trademark of Bluetooth SIG, Inc.
TINA, DesignSoft are trademarks of DesignSoft, Inc.
All other trademarks are the property of their respective owners.
11.7 Electrostatic Discharge Caution
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling and installation procedures can cause damage.
ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more
susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
11.8 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.
Copyright © 2017–2020, Texas Instruments Incorporated
Product Folder Links: OPA202 OPA2202 OPA4202
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PACKAGE OPTION ADDENDUM
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28-Jun-2023
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)
Samples
(4/5)
(6)
OPA202ID
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 120
OPA202
Samples
OPA202IDBVR
ACTIVE
SOT-23
DBV
5
3000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 120
1T72
Samples
OPA202IDBVT
ACTIVE
SOT-23
DBV
5
250
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 120
1T72
Samples
OPA202IDGKR
ACTIVE
VSSOP
DGK
8
2500
RoHS & Green
NIPDAUAG | SN
Level-2-260C-1 YEAR
-40 to 105
1T2Q
Samples
OPA202IDGKT
ACTIVE
VSSOP
DGK
8
250
RoHS & Green
NIPDAUAG | SN
Level-2-260C-1 YEAR
-40 to 105
1T2Q
Samples
OPA202IDR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 120
OPA202
Samples
OPA2202ID
ACTIVE
SOIC
D
8
75
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 150
OP2202
Samples
OPA2202IDGKR
ACTIVE
VSSOP
DGK
8
2500
RoHS & Green
NIPDAUAG | SN
Level-2-260C-1 YEAR
-40 to 120
1XDQ
Samples
OPA2202IDGKT
ACTIVE
VSSOP
DGK
8
250
RoHS & Green
NIPDAUAG | SN
Level-2-260C-1 YEAR
-40 to 120
1XDQ
Samples
OPA2202IDR
ACTIVE
SOIC
D
8
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 150
OP2202
Samples
OPA4202ID
ACTIVE
SOIC
D
14
50
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OPA4202
Samples
OPA4202IDR
ACTIVE
SOIC
D
14
2500
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OPA4202
Samples
OPA4202IPW
ACTIVE
TSSOP
PW
14
90
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OPA4202
Samples
OPA4202IPWR
ACTIVE
TSSOP
PW
14
2000
RoHS & Green
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OPA4202
Samples
(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".
Addendum-Page 1
PACKAGE OPTION ADDENDUM
www.ti.com
28-Jun-2023
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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