Product
Folder
Order
Now
Support &
Community
Tools &
Software
Technical
Documents
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
OPAx170 36-V, Single-Supply, SOT553, Low-Power Operational Amplifiers Value Line
Series
1 Features
3 Description
•
•
•
•
•
•
•
•
•
•
•
The OPA170, OPA2170, and OPA4170 devices
(OPAx170) are a family of 36-V, single-supply, lownoise operational amplifiers (op amps) that feature
micro packages with the ability to operate on supplies
ranging from 2.7 V (±1.35 V) to 36 V (±18 V). They
offer good offset, drift, and bandwidth with low
quiescent current. The single, dual, and quad
versions all have identical specifications for maximum
design flexibility.
1
•
Supply Range: 2.7 V to 36 V, ±1.35 V to ±18 V
Low Noise: 19 nV/√Hz
RFI Filtered Inputs
Input Range Includes the Negative Supply
Input Range Operates to Positive Supply
Rail-to-Rail Output
Gain Bandwidth: 1.2 MHz
Low Quiescent Current: 110 µA per Amplifier
High Common-Mode Rejection: 120 dB
Low Bias Current: 15 pA (Maximum)
Industry-Standard Packages and micro Packages
Available
Create a Custom Design Using the OPAx170 With
the WEBENCH® Power Designer
2 Applications
•
•
•
•
•
•
•
•
•
Tracking Amplifier in Power Modules
Merchant Power Supplies
Transducer Amplifiers
Bridge Amplifiers
Temperature Measurements
Strain Gauge Amplifiers
Precision Integrators
Battery-Powered Instruments
Test Equipment
Unlike most op amps, which are specified at only one
supply voltage, the OPAx170 family of op amps is
specified from 2.7 V to 36 V. Input signals beyond the
supply rails do not cause phase reversal. The
OPAx170 family is stable with capacitive loads up to
300 pF. The input can operate 100 mV below the
negative rail and within 2 V of the positive rail for
normal operation. Note that these devices can
operate with full rail-to-rail input 100 mV beyond the
positive rail, but with reduced performance within 2 V
of the positive rail. The OPAx170 op amps are
specified from –40°C to +125°C.
Device Information(1)
PART NUMBER
OPA170
OPA2170
OPA4170
PACKAGE
BODY SIZE (NOM)
SOIC (8)
4.90 mm × 3.91 mm
SOT (5)
1.60 mm × 1.20 mm
SOT-23 (5)
2.90 mm × 1.60 mm
SOIC (8)
4.90 mm × 3.91 mm
VSSOP (8)
3.00 mm × 3.00 mm
VSSOP (8), micro size
2.30 mm × 2.00 mm
WSON (8)
2.00 mm × 2.00 mm
SOIC (14)
8.65 mm × 3.91 mm
TSSOP (14)
5.00 mm × 4.40 mm
(1) For all available packages, see the orderable addendum at
the end of the data sheet.
Smallest Packaging for 36-V Operational Amplifiers
Package Footprint Comparison (to Scale)
Package Height Comparison (to Scale)
D (SO-8)
DBV (SOT23-5)
DRL (SOT553)
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.
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
Table of Contents
1
2
3
4
5
6
7
Features ..................................................................
Applications ...........................................................
Description .............................................................
Revision History.....................................................
Device Comparison Table.....................................
Pin Configuration and Functions .........................
Specifications.........................................................
7.1
7.2
7.3
7.4
7.5
7.6
7.7
7.8
8
1
1
1
2
3
4
7
Absolute Maximum Ratings ...................................... 7
ESD Ratings.............................................................. 7
Recommended Operating Conditions....................... 7
Thermal Information: OPA170 .................................. 8
Thermal Information: OPA2170 ................................ 8
Thermal Information: OPA4170 ................................ 8
Electrical Characteristics........................................... 9
Typical Characteristics ............................................ 11
Detailed Description ............................................ 18
8.1 Overview ................................................................. 18
8.2 Functional Block Diagram ...................................... 18
8.3 Feature Description................................................. 18
8.4 Device Functional Modes........................................ 22
9
Application and Implementation ........................ 23
9.1 Application Information............................................ 23
9.2 Typical Application .................................................. 23
10 Power Supply Recommendations ..................... 26
11 Layout................................................................... 26
11.1 Layout Guidelines ................................................. 26
11.2 Layout Example .................................................... 26
12 Device and Documentation Support ................. 28
12.1
12.2
12.3
12.4
12.5
12.6
12.7
12.8
Device Support......................................................
Documentation Support ........................................
Related Links ........................................................
Receiving Notification of Documentation Updates
Community Resources..........................................
Trademarks ...........................................................
Electrostatic Discharge Caution ............................
Glossary ................................................................
28
29
29
29
29
30
30
30
13 Mechanical, Packaging, and Orderable
Information ........................................................... 30
4 Revision History
NOTE: Page numbers for previous revisions may differ from page numbers in the current version.
Changes from Revision D (December 2017) to Revision E
Page
•
Changed minimum supply voltage from –20 V to 0 V in Absolute Maximum Ratings table .................................................. 7
•
Changed maximum supply voltage from 20 V to 40 V in Absolute Maximum Ratings table ................................................ 7
Changes from Revision C (March 2016) to Revision D
Page
•
Added WEBENCH links and sections and Receiving Notification of Documentation Updates.............................................. 1
•
Added 8-Pin DSG (WSON) package...................................................................................................................................... 1
•
Changed values in Equivalent Internal ESD Circuitry Relative to a Typical Circuit Application from: 250 Ω to: 2.5 Ω........ 20
Changes from Revision B (September 2012) to Revision C
Page
•
Added current package designators to Features list and final paragraph of Description section .......................................... 1
•
Added Pin Functions table, ESD Ratings table, Recommended Operating Conditions table, Detailed Description
section, 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 A (September 2011) to Revision B
•
2
Page
Added "Value Line Series" to document title.......................................................................................................................... 1
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
5 Device Comparison Table
DEVICE
NO OF
CHANNELS
PACKAGE-LEAD
SOT
SOT23-5
D
DSG
VSSOP
VSSOP
(micro size)
TSSOP
—
OPA170
1
5
5
8
—
—
—
OPA2170
2
—
—
8
8
8
8
—
OPA4170
4
—
—
14
—
—
—
14
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
3
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
6 Pin Configuration and Functions
OPA170 DRL Package
5-Pin SOT
Top View
IN+
1
V-
2
IN-
3
5
4
OPA170 DBV Package
5-Pin SOT-23
Top View
V+
OUT
1
V-
2
+IN
3
5
V+
4
-IN
OUT
OPA170 D Package
8-Pin SOIC
Top View
NC(1)
1
8
NC(1)
-IN
2
7
V+
+IN
3
6
OUT
V-
4
5
NC(1)
Pin Functions: OPA170
PIN
NAME
I/O
DESCRIPTION
SOT
SOT-23
D
IN– (–IN)
3
4
2
I
Negative (inverting) input
IN+ (+IN)
1
3
3
I
Positive (noninverting) input
(1)
NC
—
—
1, 5, 8
—
No internal connection (can be left floating)
OUT
4
1
6
O
Output
V+
5
5
7
—
Positive (highest) power supply
V–
2
2
4
—
Negative (lowest) power supply
(1)
4
NC indicates no internal connection.
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
OPA2170 D, DGK, and DCU Packages
8-Pin VSSOP, SOIC, and VSSOP (micro size)
Top View
OUT A
1
8
V+
-IN A
2
7
OUT B
+IN A
3
6
-IN B
V-
4
5
+IN B
OPA2170 DSG Package
8-Pin WSON
Top View
OUT A
1
±IN A
2
+IN A
3
V±
4
Thermal
Pad
8
V+
7
OUT B
6
±IN B
5
+IN B
Pin Functions: OPA2170
PIN
NAME
SOIC
VSSOP
VSSOP
(micro
size)
WSON
–IN A
2
2
2
2
I
Inverting input, channel A
–IN B
6
6
6
6
I
Inverting input, channel B
+IN A
3
3
3
3
I
Noninverting input, channel A
+IN B
5
5
5
5
I
Noninverting input, channel B
OUT A
1
1
1
1
O
Output, channel A
OUT B
7
7
7
7
O
Output, channel B
V–
4
4
4
4
—
Negative (lowest) power supply
V+
8
8
8
8
—
Positive (highest) power supply
I/O
DESCRIPTION
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
5
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
OPA4170 D and PW Packages
14-Pin SOIC and 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
Pin Functions: OPA4170
PIN
I/O
DESCRIPTION
NAME
SOIC
TSSOP
–IN A
2
2
I
Inverting input, channel A
–IN B
6
6
I
Inverting input, channel B
–IN C
9
9
I
Inverting input, channel C
–IN D
13
13
I
Inverting input, channel D
+IN A
3
3
I
Noninverting input, channel A
+IN B
5
5
I
Noninverting input, channel B
+IN C
10
10
I
Noninverting input, channel C
+IN D
12
12
I
Noninverting input, channel D
OUT A
1
1
O
Output, channel A
OUT B
7
7
O
Output, channel B
OUT C
8
8
O
Output, channel C
OUT D
14
14
O
Output, channel D
V–
11
11
—
Negative (lowest) power supply
V+
4
4
—
Positive (highest) power supply
6
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
7 Specifications
7.1 Absolute Maximum Ratings
Over operating free-air temperature range, unless otherwise noted. (1)
MIN
MAX
UNIT
0
40
V
40
V
Signal input pin voltage
(V–) – 0.5
(V+) + 0.5
V
Signal input pin current
–10
10
mA
150
°C
150
°C
150
°C
Supply voltage
Single supply voltage
Output short-circuit current (2)
Continuous
Operating ambient temperature, TA
–55
Junction temperature, TJ
Storage temperature, Tstg
(1)
(2)
–65
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.
Short-circuit to ground, one amplifier per package.
7.2 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)
±750
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.
7.3 Recommended Operating Conditions
over operating free-air temperature range (unless otherwise noted)
MIN
MAX
UNIT
VS
Supply voltage (V+ – V–)
2.7
36
V
TA
Operating temperature
–40
125
°C
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
7
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
7.4 Thermal Information: OPA170
OPA170
THERMAL METRIC (1)
D (SOIC)
DBV (SOT-23)
DRL (SOT)
8 PINS
5 PINS
5 PINS
UNIT
208.1
°C/W
RθJA
Junction-to-ambient thermal resistance
149.5
245.8
RθJC(top)
Junction-to-case (top) thermal resistance
97.9
133.9
0.1
°C/W
RθJB
Junction-to-board thermal resistance
87.7
83.6
42.4
°C/W
ψJT
Junction-to-top characterization parameter
35.5
18.2
0.5
°C/W
ψJB
Junction-to-board characterization parameter
89.5
83.1
42.2
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
—
—
—
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.5 Thermal Information: OPA2170
OPA2170
THERMAL METRIC
(1)
D (SOIC)
DCU (VSSOP,
micro size)
DGK (VSSOP)
DSG (WSON)
UNIT
8 PINS
8 PINS
8 PINS
8 PINS
RθJA
Junction-to-ambient thermal resistance
134.3
175.2
180
71.5
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
72.1
74.9
55
89.1
°C/W
RθJB
Junction-to-board thermal resistance
60.6
22.2
130
38.8
°C/W
ψJT
Junction-to-top characterization parameter
18.2
1.6
5.3
3.8
°C/W
ψJB
Junction-to-board characterization parameter
53.8
22.8
120
38.9
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
—
—
—
13
°C/W
(1)
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
7.6 Thermal Information: OPA4170
OPA4170
THERMAL METRIC
(1)
D (SOIC)
PW (TSSOP)
14 PINS
14 PINS
UNIT
RθJA
Junction-to-ambient thermal resistance
93.2
106.9
°C/W
RθJC(top)
Junction-to-case (top) thermal resistance
51.8
24.4
°C/W
RθJB
Junction-to-board thermal resistance
49.4
59.3
°C/W
ψJT
Junction-to-top characterization parameter
13.5
0.6
°C/W
ψJB
Junction-to-board characterization parameter
42.2
54.3
°C/W
RθJC(bot)
Junction-to-case (bottom) thermal resistance
—
—
°C/W
(1)
8
For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application
report.
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
7.7 Electrical Characteristics
at TA = 25°C, VCM = VOUT = VS / 2, and RL = 10 kΩ connected to VS / 2 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
0.25
±1.8
mV
OFFSET VOLTAGE
TA = 25°C
VOS
Input offset voltage
dVOS/dT
Input offset voltage drift
TA = –40°C to +125°C
PSRR
Input offset voltage vs power supply
VS = 4 V to 36 V, TA = –40°C to +125°C
TA = –40°C to +125°C
Channel separation, dc
±2
mV
±0.3
±2
µV/°C
1
±5
µV/V
5
µV/V
INPUT BIAS CURRENT
IB
Input bias current
IOS
Input offset current
TA = 25°C
±8
TA = –40°C to +125°C
TA = 25°C
±4
TA = –40°C to +125°C
±15
pA
±3.5
nA
±15
pA
±3.5
nA
NOISE
Input voltage noise
en
Input voltage noise density
ƒ = 0.1 Hz to 10 Hz
2
µVPP
ƒ = 100 Hz
22
nV/√Hz
ƒ = 1 kHz
19
nV/√Hz
INPUT VOLTAGE
Common-mode voltage range (1)
VCM
CMRR
Common-mode rejection ratio
(V–) – 0.1
(V+) – 2
V
VS = ±2 V, (V–) - 0.1 V < VCM < (V+) - 2 V,
TA = –40°C to +125°C
90
104
dB
VS = ±18 V, (V–) - 0.1 V < VCM < (V+) - 2 V,
TA = –40°C to +125°C
104
120
dB
INPUT IMPEDANCE
Differential
100 || 3
Common-mode
MΩ || pF
6 || 3
1012 Ω || pF
130
dB
OPEN-LOOP GAIN
AOL
Open-loop voltage gain
VS = 4 V to 36 V,
(V–) + 0.35 V < VO < (V+) - 0.35 V,
TA = –40°C to +125°C
110
FREQUENCY RESPONSE
GBP
Gain bandwidth product
SR
Slew rate
tS
THD+N
(1)
1.2
MHz
G = +1
0.4
V/µs
To 0.1%, VS = ±18 V, G = +1, 10-V step
20
µs
Settling time
To 0.01% (12-bit), VS = ±18 V, G = +1,
10-V step
28
µs
Overload recovery time
VIN × Gain > VS
2
µs
Total harmonic distortion + noise
G = +1, ƒ = 1 kHz, VO = 3 VRMS
0.0002%
The input range can be extended beyond (V+) – 2 V up to V+. See the Typical Characteristics and Application and Implementation
sections for additional information.
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
9
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
Electrical Characteristics (continued)
at TA = 25°C, VCM = VOUT = VS / 2, and RL = 10 kΩ connected to VS / 2 (unless otherwise noted)
PARAMETER
TEST CONDITIONS
MIN
TYP
MAX
UNIT
OUTPUT
VO
VO
Voltage output swing from positive rail
Voltage output swing from negative rail
VO
Voltage output swing from rail
ISC
Short-circuit current
CLOAD
Capacitive load drive
RO
Open-loop output resistance
IL = 0 mA, VS = 4 V to 36 V
10
IL sourcing 1 mA, VS = 4 V to 36 V
mV
115
mV
IL = 0 mA, VS = 4 V to 36 V
IL sinking 1 mA, VS = 4 V to 36 V
8
mV
70
mV
VS = 5 V, RL = 10 kΩ; TA = –40°C to +125°C
(V–) + 0.03
(V+) – 0.05
V
RL = 10 kΩ, AOL ≥ 110 dB,
TA = –40°C to +125°C
(V–) + 0.35
(V+) – 0.35
V
–20
17
See Typical Characteristics
ƒ = 1 MHz, IO = 0 A
mA
pF
900
Ω
POWER SUPPLY
VS
IQ
Specified voltage range
Quiescent current per amplifier
2.7
IO = 0 A; TA = 25°C
110
IO = 0 A; TA = –40°C to +125°C
36
V
145
µA
155
µA
TEMPERATURE
10
Specified range
–40
125
°C
Operating range
–55
150
°C
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
7.8 Typical Characteristics
VS = ±18 V, VCM = VS / 2, RLOAD = 10 kΩ connected to VS / 2, and CL = 100 pF, (unless otherwise noted)
Table 1. Characteristic Performance Measurements
DESCRIPTION
FIGURE
Offset Voltage Production Distribution
Figure 1
Offset Voltage Drift Distribution
Figure 2
Offset Voltage vs Temperature
Figure 3
Offset Voltage vs Common-Mode Voltage
Figure 4
Offset Voltage vs Common-Mode Voltage (Upper Stage)
Figure 5
Offset Voltage vs Power Supply
Figure 6
IB and IOS vs Common-Mode Voltage
Figure 7
Input Bias Current vs Temperature
Figure 8
Output Voltage Swing vs Output Current (Maximum Supply)
Figure 9
CMRR and PSRR vs Frequency (Referred-to-Input)
Figure 10
CMRR vs Temperature
Figure 11
PSRR vs Temperature
Figure 12
0.1-Hz to 10-Hz Noise
Figure 13
Input Voltage Noise Spectral Density vs Frequency
Figure 14
THD+N Ratio vs Frequency
Figure 15
THD+N vs Output Amplitude
Figure 16
Quiescent Current vs Temperature
Figure 17
Quiescent Current vs Supply Voltage
Figure 18
Open-Loop Gain and Phase vs Frequency
Figure 19
Closed-Loop Gain vs Frequency
Figure 20
Open-Loop Gain vs Temperature
Figure 21
Open-Loop Output Impedance vs Frequency
Small-Signal Overshoot vs Capacitive Load (100-mV Output Step)
Figure 22
Figure 23, Figure 24
No Phase Reversal
Figure 25
Positive Overload Recovery
Figure 26
Negative Overload Recovery
Figure 27
Small-Signal Step Response (100 mV)
Figure 28, Figure 29
Large-Signal Step Response
Figure 30, Figure 31
Large-Signal Settling Time (10-V Positive Step)
Figure 32
Large-Signal Settling Time (10-V Negative Step)
Figure 33
Short-Circuit Current vs Temperature
Figure 34
Maximum Output Voltage vs Frequency
Figure 35
EMIRR IN+ vs Frequency
Figure 36
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
11
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
25
20
Distribution Taken From 400 Amplifiers
Distribution Taken From 104 Amplifiers
Percentage of Amplifiers (%)
Percentage of Amplifiers (%)
18
16
14
12
10
8
6
4
20
15
10
5
2
0
−1200
−1100
−1000
−900
−800
−700
−600
−500
−400
−300
−200
−100
0
100
200
300
400
500
600
700
800
900
1000
1100
1200
0
0.1
0.2
0.3
0.4
0.5
0.6
0.7
0.8
0.9
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
0
Offset Voltage (µV)
Offset Voltage Drift (µV/°C)
G001
Figure 1. Offset Voltage Production Distribution
G002
Figure 2. Offset Voltage Drift Distribution
1000
800
5 Typical Units Shown
Offset Voltage (mV)
Offset Voltage (µV)
600
400
200
0
−200
−400
VCM = - 18.1V
−600
−800
−1000
−50
−25
0
25
50
75
Temperature (°C)
100
125
150
Common-Mode Voltage (V)
G003
Figure 3. Offset Voltage vs Temperature
Figure 4. Offset Voltage vs Common-Mode Voltage
500
VSUPPLY = ±1.35V to ± 18V
5 Typical Units Shown
5 Typical Units Shown
Offset Voltage (µV)
Offset Voltage (mV)
300
Normal
Operation
100
−100
−300
−500
0
2
4
Common-Mode Voltage (V)
Figure 5. Offset Voltage vs Common-Mode Voltage
(Upper Stage)
12
Submit Documentation Feedback
6
8
10
12
VSUPPLY (V)
14
16
18
20
G006
Figure 6. Offset Voltage vs Power Supply
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
12
2000
IB+
+IB
IOS
Input Bias Current (pA)
IB and IOS (pA)
IB-
1500
10
8
6
IOS
4
1000
500
0
-IB
-500
2
VCM = 16.1V
VCM = -18.1V
-1000
0
-20
-15
-10
0
VCM (V)
-5
5
10
15
-75
20
-25
0
50
75
100
125
150
Figure 8. Input Bias Current vs Temperature
Figure 7. IB and IOS vs Common-Mode Voltage
140
Common-Mode Rejection Ratio (dB),
Power-Supply Rejection Ratio (dB)
17
16
15
14.5
-14.5
-15
-40°C
+25°C
+125°C
-16
-17
120
100
80
60
40
+PSRR
-PSRR
CMRR
20
0
-18
0
1
2
3
4
5
6
7
8
9
1
10
10
100
1k
10k
100k
1M
Frequency (Hz)
Output Current (mA)
Figure 9. Output Voltage Swing vs Output Current
(Maximum Supply)
Figure 10. CMRR and PSRR vs Frequency
(Referred-to Input)
3
30
VS = ±1.35V
VS = ±2V
25
VS = ±18V
20
15
10
5
0
-75
-50
-25
0
25
50
75
100
125
150
Power−Supply Rejection Ratio (µV/V)
Common-Mode Rejection Ratio (mV/V)
25
Temperature (°C)
18
Output Voltage (V)
-50
2
1
0
−1
−2
−3
−75
VS = 2.7V to 36V
VS = 4V to 36V
−50
−25
Temperature (°C)
Figure 11. CMRR vs Temperature
0
25
50
75
Temperature (°C)
100
125
150
G012
Figure 12. PSRR vs Temperature
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
13
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
1mV/div
Voltage Noise Density (nV/ Hz)
1000
100
10
1
Figure 13. 0.1-Hz to 10-Hz Noise
-120
0.0001
1k
1k
10k
Frequency (Hz)
-140
100k
10k
0.1
Total Harmonic Distortion + Noise (%)
Total Harmonic Distortion + Noise (%)
-100
0.001
100
100
100k
1M
G014
BW = 80kHz
G = +1
RL = 10kW
-60
0.01
-80
0.001
-100
0.0001
-120
0.00001
0.01
0.1
1
10
Total Harmonic Distortion + Noise (dB)
-80
VOUT = 3VRMS
BW = 80kHz
G = +1
RL = 10kW
0.00001
10
10
Figure 14. Input Voltage Noise Spectral Density vs
Frequency
Total Harmonic Distortion + Noise (dB)
0.01
1
-140
20
Output Amplitude (VRMS)
Frequency (Hz)
Figure 15. THD+N Ratio vs Frequency
Figure 16. THD+N vs Output Amplitude
140
130
VS = ±18V
120
IQ (µA)
IQ (PA)
110
100
90
80
VS = ±1.35V
70
60
-50
-25
0
25
50
75
Temperature (qC)
100
125
150
Figure 17. Quiescent Current vs Temperature
14
Submit Documentation Feedback
G017
Figure 18. Quiescent Current vs Supply Voltage
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
140
135
120
90
Gain
100
40
45
30
0
-45
Phase (°)
Phase
60
Gain (dB)
80
Gain (dB)
50
20
40
-90
20
-135
0
-180
-20
-225
−10
-270
10M
−20
-40
0.1
1
10
100
1k
10k
100k
1M
10
0
G = −1
G=1
G = 100
1k
10k
100k
1M
Frequency (Hz)
Frequency (Hz)
Figure 19. Open-Loop Gain and Phase vs Frequency
10M
100M
G020
Figure 20. Closed-Loop Gain vs Frequency
10k
3
VS = 2.7V
VS = 4V
2.5
1k
VS = 36V
ZO (W)
AOL (mV/V)
2
1.5
100
10
1
1
0.5
1m
0
-75
-50
-25
0
25
50
75
100
125
150
1
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Temperature (°C)
Figure 21. Open-Loop Gain vs Temperature
W
Figure 22. Open-Loop Output Impedance vs Frequency
W
G = +1
+18V
RI = 10kW
RF = 10kW
ROUT
W
W
W
-18V
G = -1
+18V
OPA170
RL
W
W
W
CL
100-mV output step
Figure 23. Small-Signal Overshoot vs Capacitive Load
ROUT
OPA170
CL
-18V
100-mV output step
Figure 24. Small-Signal Overshoot vs Capacitive Load
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
15
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
+18V
OPA170
20kW
5V/div
5V/div
-18V
37VPP
Sine Wave
(±18.5V)
+18V
2kW
OPA170
VOUT
VIN
-18V
G = -10
Time (100ms/div)
Time (10ms/div)
Figure 25. No Phase Reversal
Figure 26. Positive Overload Recovery
20kW
2kW
RL = 10kW
CL = 10pF
+18V
OPA170
VOUT
VIN
5V/div
G = -10
20mV/div
-18V
+18V
OPA170
-18V
Time (10ms/div)
RL
CL
Time (5ms/div)
Figure 27. Negative Overload Recovery
Figure 28. Small-Signal Step Response (100 mV)
G = +1
RL = 10kW
CL = 10pF
RI
= 2kW
RF
2V/div
RL = 10kW
CL = 10pF
20mV/div
G = +1
= 2kW
+18V
OPA170
CL
-18V
G = -1
Time (50ms/div)
Time (5ms/div)
Figure 29. Small-Signal Step Response (100 mV)
16
Submit Documentation Feedback
Figure 30. Large-Signal Step Response
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
10
G = -1
RL = 10kW
CL = 10pF
2V/div
D From Final Value (mV)
8
6
4
12-Bit Settling
2
0
-2
(±1/2LSB = ±0.012%)
-4
-6
-8
-10
0
Time (50ms/div)
10
20
30
40
50
60
70
80
90
100
Time (ms)
10-V positive step
Figure 32. Large-Signal Settling Time
Figure 31. Large-Signal Step Response
10
G = -1
6
4
12-Bit Settling
2
ISC (mA)
D From Final Value (mV)
8
0
-2
(±1/2LSB = ±0.012%)
-4
-6
-8
-10
0
10
20
30
40
50
60
30
25
20
15
10
5
0
−5
−10
−15
−20
−25
−30
−50
ISC, Source
ISC, Sink
−25
0
25
50
75
Temperature (°C)
Time (ms)
100
125
150
G034
10-V negative step
Figure 33. Large-Signal Settling Time
Figure 34. Short-Circuit Current vs Temperature
15
140
VS = ±15 V
120
Maximum output range without
slew−rate induced distortion
10
EMIRR IN+ (dB)
Output Voltage (VPP )
12.5
7.5
VS = ±5 V
5
2.5
0
10k
80
60
40
PRP = -10dBm
VS = ±18V
VCM = 0V
20
VS = ±1.35 V
1k
100
100k
Frequency (Hz)
1M
10M
Figure 35. Maximum Output Voltage vs Frequency
0
10M
100M
1G
10G
Frequency (Hz)
G035
Figure 36. EMIRR IN+ vs Frequency
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
17
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
8 Detailed Description
8.1 Overview
The OPAx170 family of operational amplifiers provides high overall performance, making them ideal for many
general-purpose applications. The excellent offset drift of only 2 μV/°C provides excellent stability over the entire
temperature range. In addition, the device offers very good overall performance with high CMRR, PSRR, and
AOL.
8.2 Functional Block Diagram
PCH
FF Stage
Ca
Cb
+IN
PCH
Input Stage
Output
Stage
2nd Stage
OUT
-IN
NCH
Input Stage
8.3 Feature Description
8.3.1 Operating Characteristics
The OPAx170 family of amplifiers is specified for operation from 2.7 V to 36 V (±1.35 V to ±18 V). Many of the
specifications apply from –40°C to +125°C. Parameters that can exhibit significant variance with regard to
operating voltage or temperature are presented in the Typical Characteristics.
18
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
Feature Description (continued)
8.3.2 Phase-Reversal Protection
The OPAx170 family has an internal phase-reversal protection. Many operational amplifiers 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 of the OPAx170 prevents phase reversal with
excessive common-mode voltage. Instead, the output limits into the appropriate rail. This performance is shown
in Figure 37.
+18V
OPA170
5V/div
-18V
37VPP
Sine Wave
(±18.5V)
Time (100ms/div)
Figure 37. No Phase Reversal
8.3.3 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 can 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.
A good understanding of this basic ESD circuitry and its relevance to an electrical overstress event is helpful.
Figure 38 illustrates the ESD circuits contained in the OPAx170 (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 the diodes meet at an absorption device internal to the operational
amplifier. This protection circuitry is intended to remain inactive during normal circuit operation.
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
19
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
Feature Description (continued)
TVS
+
±
RF
+VS
R1
IN±
2.5 NŸ
RS
IN+
2.5 NŸ
+
Power-Supply
ESD Cell
ID
VIN
RL
+
±
+
±
±VS
TVS
Figure 38. Equivalent Internal ESD Circuitry Relative to a Typical Circuit Application
An ESD event produces a short-duration, high-voltage pulse that is transformed into a short-duration, highcurrent pulse when discharging through a semiconductor device. The ESD protection circuits are designed to
provide a current path around the operational amplifier core to prevent damage. The energy absorbed by the
protection circuitry is then dissipated as heat.
When an ESD voltage develops across two or more amplifier device pins, current flows through one or more
steering diodes. Depending on the path that the current takes, the absorption device can activate. The absorption
device has a trigger, or threshold voltage, that is above the normal operating voltage of the OPAx170 but below
the device breakdown voltage level. When 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 (refer to Figure 38), the ESD protection components are
intended to remain inactive and do 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 internal ESD protection circuits can turn on and conduct current. Any
such current flow occurs through steering-diode paths and rarely involves the absorption device.
Figure 38 shows a specific example where the input voltage (VIN) exceeds the positive supply voltage (V+) by
500 mV or more. Much of what happens in the circuit depends on the supply characteristics. If V+ can sink the
current, one of the upper input steering diodes conducts and directs current to V+. 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 can 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.
20
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
Feature Description (continued)
Another common question involves what happens to the amplifier if an input signal is applied to the input when
the power supplies (V+ or V–) are at 0 V. Again, this question depends on the supply characteristic when at 0 V,
or at a level below the input signal amplitude. If the supplies appear as high impedance, then the input source
supplies the operational amplifier current through the current-steering diodes. This state is not a normal bias
condition; most likely, the amplifier 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 any uncertainty about the ability of the supply to absorb this current, add external Zener diodes to the
supply pins; see Figure 38. Select the Zener voltage so 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 begins to rise
above the safe-operating, supply-voltage level.
The OPAx170 input pins are protected from excessive differential voltage with back-to-back diodes; see
Figure 38. In most circuit applications, the input protection circuitry has no effect. However, in low-gain or G = 1
circuits, fast-ramping input signals can forward-bias these diodes because the output of the amplifier cannot
respond rapidly enough to the input ramp. If the input signal is fast enough to create this forward-bias condition,
limit the input signal current to 10 mA or less. If the input signal current is not inherently limited, an input series
resistor can be used to limit the input signal current. This input series resistor degrades the low-noise
performance of the OPAx170. Figure 38 illustrates an example configuration that implements a current-limiting
feedback resistor.
8.3.4 Capacitive Load and Stability
The dynamic characteristics of the OPAx170 have been optimized for common operating conditions. 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.
The simplest way to achieve this isolation is to add a small resistor (for example, ROUT equal to 50 Ω) in series
with the output. Refer to Figure 39 and Figure 40 illustrate graphs of small-signal overshoot versus capacitive
load for several values of ROUT. Also, refer to applications bulletin AB-028, Feedback Plots Define Op Amp AC
Performance, for details of analysis techniques and application circuits.
W
W
G = +1
+18V
RI = 10kW
RF = 10kW
ROUT
W
W
W
100-mV Output Step
-18V
G = -1
+18V
OPA170
RL
G=1
Figure 39. Small-Signal Overshoot vs Capacitive Load
ROUT
W
W
W
CL
100-mV Output Step
OPA170
CL
-18V
G = –1
Figure 40. Small-Signal Overshoot vs Capacitive Load
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
21
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
8.4 Device Functional Modes
8.4.1 Common-Mode Voltage Range
The input common-mode voltage range of the OPAx170 series extends 100 mV below the negative rail and
within 2 V of the top rail for normal operation.
This device can operate with full rail-to-rail input 100 mV beyond the top rail, but with reduced performance within
2 V of the top rail. The typical performance in this range is summarized in Table 2.
Table 2. Typical Performance for Common-Mode Voltages Within 2 V of the Positive Supply
PARAMETER
MIN
Input common-mode voltage
Offset voltage
TYP
(V+) – 2
MAX
(V+) + 0.1
vs temperature
Common-mode rejection
UNIT
V
7
mV
12
µV/°C
65
dB
Open-loop gain
60
dB
Gain-bandwidth product
0.3
MHz
Slew rate
0.3
V/µs
8.4.2 Overload Recovery
Overload recovery is defined as the time required for the operational amplifier output to recover from the
saturated state to the linear state. The output devices of the operational amplifier enter the saturation region
when the output voltage exceeds the rated operating voltage, either resulting from the high input voltage or the
high gain. After the device enters the saturation region, the charge carriers in the output devices need time to
return back to the normal state. After the charge carriers return back to the equilibrium state, the device begins to
slew at the normal slew rate. Thus, the propagation delay in case of an overload condition is the sum of the
overload recovery time and the slew time. The overload recovery time for the OPAx170 is approximately 2 µs.
22
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
9 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.
9.1 Application Information
The OPAx170 family of operational amplifiers provides high overall performance in a large number of generalpurpose applications. As with all amplifiers, 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. Follow the
additional recommendations in Layout Guidelines in order to achieve the maximum performance from this device.
Many applications may introduce capacitive loading to the output of the amplifier (potentially causing instability).
One method of stabilizing the amplifier in such applications is to add an isolation resistor between the amplifier
output and the capacitive load. The design process for selecting this resistor is given in Typical Application.
9.2 Typical Application
This circuit can be used to drive capacitive loads such as cable shields, reference buffers, MOSFET gates, and
diodes. The circuit uses an isolation resistor (Riso) to stabilize the output of an operational amplifier. Riso
modifies the open-loop gain of the system to ensure the circuit has sufficient phase margin.
+VS
VOUT
RISO
+
VIN
+
±
CLOAD
-VS
Figure 41. Unity-Gain Buffer With RISO Stability Compensation
9.2.1 Design Requirements
The design requirements are:
• Supply voltage: 30 V (±15 V)
• Capacitive loads: 100 pF, 1000 pF, 0.01 µF, 0.1 µF, and 1 µF
• Phase margin: 45° and 60°
9.2.2 Detailed Design Procedure
9.2.2.1 Custom Design With WEBENCH® Tools
Click here to create a custom design using the OPAx170 device with the WEBENCH® Power Designer.
1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.
2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.
3. Compare the generated design with other possible solutions from Texas Instruments.
The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time
pricing and component availability.
In most cases, these actions are available:
• Run electrical simulations to see important waveforms and circuit performance
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
23
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
Typical Application (continued)
•
•
•
Run thermal simulations to understand board thermal performance
Export customized schematic and layout into popular CAD formats
Print PDF reports for the design, and share the design with colleagues
Get more information about WEBENCH tools at www.ti.com/WEBENCH.
9.2.2.2 Unity-Gain Buffer
Figure 41 shows a unity-gain buffer driving a capacitive load. Equation 1 shows the transfer function for the
circuit in Figure 41. Not shown in Figure 41 is the open-loop output resistance of the operational amplifier, Ro.
1 + CLOAD × RISO × s
T(s) =
1 + Ro + RISO × CLOAD × s
(1)
The transfer function in Equation 1 has a pole and a zero. The frequency of the pole (fp) is determined by (Ro +
RISO) and CLOAD. Components RISO and CLOAD determine the frequency of the zero (fz). A stable system is
obtained by selecting RISO such that the rate of closure (ROC) between the open-loop gain (AOL) and 1/β is 20
dB/decade. Figure 42 depicts the concept. The 1/β curve for a unity-gain buffer is 0 dB.
120
AOL
100
1
fp
2 u Πu RISO
Gain (dB)
80
60
Ro
u CLOAD
40 dB
fz
40
1
2 u Πu RISO u CLOAD
1 dec
1/
20
ROC
20 dB
dec
0
10
100
1k
10k
100k
1M
10M
100M
Frequency (Hz)
Figure 42. Unity-Gain Amplifier With RISO Compensation
ROC stability analysis is typically simulated. The validity of the analysis depends on multiple factors, especially
the accurate modeling of Ro. In addition to simulating the ROC, a robust stability analysis includes a
measurement of overshoot percentage and ac gain peaking of the circuit using a function generator,
oscilloscope, and gain and phase analyzer. Phase margin is then calculated from these measurements. Table 3
shows the overshoot percentage and ac gain peaking that correspond to phase margins of 45° and 60°. For
more details on this design and other alternative devices that can be used in place of the OPA170, see the
Precision Design, Capacitive Load Drive Solution Using an Isolation Resistor.
Table 3. Phase Margin versus Overshoot and AC Gain
Peaking
24
PHASE
MARGIN
OVERSHOOT
AC GAIN PEAKING
45°
23.3%
2.35 dB
60°
8.8%
0.28 dB
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
9.2.3 Application Curve
Using the described methodology, the values of RISO that yield phase margins of 45º and 60º for various
capacitive loads were determined. The results are shown in Figure 43.
10000
45° Phase Margin
Isolation Resistor (RISO,
)
60° Phase Margin
1000
100
10
0.1
1
10
100
Capacitive Load (nF)
1000
C002
Figure 43. Isolation Resistor Required for Various Capacitive Loads to Achieve a Target Phase Margin
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
25
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
10 Power Supply Recommendations
The OPAx170 is specified for operation from 2.7 V to 36 V (±1.35 V to ±18 V); many specifications apply from
–40°C to 85°C. Parameters that can exhibit significant variance with regard to operating voltage or temperature
are presented in the Typical Characteristics.
CAUTION
Supply voltages larger 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.
11 Layout
11.1 Layout Guidelines
For best operational performance of the device, use good printed-circuit board (PCB) layout practices, including:
• Noise can propagate into analog circuitry through the power pins of the circuit as a whole and the
operational amplifier itself. Bypass capacitors are used to reduce the coupled noise by providing lowimpedance 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 to the device as possible. 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 application report SLOA089, Circuit Board Layout Techniques.
• In order to reduce parasitic coupling, run the input traces as far away from the supply or output traces as
possible. If these traces cannot be kept separate, crossing the sensitive trace perpendicularly is much
better than in parallel with the noisy trace.
• Place the external components as close to the device as possible. As illustrated in Figure 45, 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.
11.2 Layout Example
+
VIN
VOUT
RG
RF
Figure 44. Schematic Representation
26
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
Layout Example (continued)
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
NC
NC
Use a low-ESR,
ceramic bypass
capacitor
RG
GND
±IN
V+
VIN
+IN
OUTPUT
V±
NC
GND
VS±
GND
VOUT
Ground (GND) plane on another layer
Use low-ESR,
ceramic bypass
capacitor
Figure 45. Operational Amplifier Board Layout for a Noninverting Configuration
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
27
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
12 Device and Documentation Support
12.1 Device Support
12.1.1 Third-Party Products Disclaimer
TI'S PUBLICATION OF INFORMATION REGARDING THIRD-PARTY PRODUCTS OR SERVICES DOES NOT
CONSTITUTE AN ENDORSEMENT REGARDING THE SUITABILITY OF SUCH PRODUCTS OR SERVICES
OR A WARRANTY, REPRESENTATION OR ENDORSEMENT OF SUCH PRODUCTS OR SERVICES, EITHER
ALONE OR IN COMBINATION WITH ANY TI PRODUCT OR SERVICE.
12.1.2 Development Support
12.1.2.1 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.
12.1.2.2 DIP Adapter EVM
The DIP Adapter EVM tool provides an easy, low-cost way to prototype small surface mount ICs. The evaluation
tool these TI packages: D or U (SOIC-8), PW (TSSOP-8), DGK (MSOP-8), DBV (SOT23-6, SOT23-5 and
SOT23-3), DCK (SC70-6 and SC70-5), and DRL (SOT563-6). The DIP Adapter EVM may also be used with
terminal strips or may be wired directly to existing circuits.
12.1.2.3 Universal Operational Amplifier EVM
The Universal Op Amp EVM is a series of general-purpose, blank circuit boards that simplify prototyping circuits
for a variety of IC package types. The evaluation module board design allows many different circuits to be
constructed easily and quickly. Five models are offered, with each model intended for a specific package type.
PDIP, SOIC, MSOP, TSSOP and SOT23 packages are all supported.
NOTE
These boards are unpopulated, so users must provide their own ICs. TI recommends
requesting several op amp device samples when ordering the Universal Op Amp EVM.
12.1.2.4 TI 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. TI Precision Designs are available online at
http://www.ti.com/ww/en/analog/precision-designs/.
28
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
OPA170, OPA2170, OPA4170
www.ti.com
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
Device Support (continued)
12.1.2.5 WEBENCH® Filter Designer
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.
12.1.2.6 Custom Design With WEBENCH® Tools
Click here to create a custom design using the OPAx170 device with the WEBENCH® Power Designer.
1. Start by entering the input voltage (VIN), output voltage (VOUT), and output current (IOUT) requirements.
2. Optimize the design for key parameters such as efficiency, footprint, and cost using the optimizer dial.
3. Compare the generated design with other possible solutions from Texas Instruments.
The WEBENCH Power Designer provides a customized schematic along with a list of materials with real-time
pricing and component availability.
In most cases, these actions are available:
• Run electrical simulations to see important waveforms and circuit performance
• Run thermal simulations to understand board thermal performance
• Export customized schematic and layout into popular CAD formats
• Print PDF reports for the design, and share the design with colleagues
Get more information about WEBENCH tools at www.ti.com/WEBENCH.
12.2 Documentation Support
12.2.1 Related Documentation
For related documentation, see the following (available for download from www.ti.com):
• Feedback Plots Define Op Amp AC Performance
• Capacitive Load Drive Solution Using an Isolation Resistor
• Circuit Board Layout Techniques
12.3 Related Links
The table below 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
OPA170
Click here
Click here
Click here
Click here
Click here
OPA2170
Click here
Click here
Click here
Click here
Click here
OPA4170
Click here
Click here
Click here
Click here
Click here
12.4 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.
12.5 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.
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
Submit Documentation Feedback
29
OPA170, OPA2170, OPA4170
SBOS557E – AUGUST 2011 – REVISED APRIL 2018
www.ti.com
Community Resources (continued)
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.
12.6 Trademarks
TINA-TI, E2E are trademarks of Texas Instruments.
WEBENCH is a registered trademark of Texas Instruments.
TINA, DesignSoft are trademarks of DesignSoft, Inc.
All other trademarks are the property of their respective owners.
12.7 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.
12.8 Glossary
SLYZ022 — TI Glossary.
This glossary lists and explains terms, acronyms, and definitions.
13 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.
30
Submit Documentation Feedback
Copyright © 2011–2018, Texas Instruments Incorporated
Product Folder Links: OPA170 OPA2170 OPA4170
PACKAGE OPTION ADDENDUM
www.ti.com
6-Feb-2020
PACKAGING INFORMATION
Orderable Device
Status
(1)
Package Type Package Pins Package
Drawing
Qty
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Op Temp (°C)
Device Marking
(4/5)
OPA170AID
ACTIVE
SOIC
D
8
75
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
O170A
OPA170AIDBVR
ACTIVE
SOT-23
DBV
5
3000
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OSVI
OPA170AIDBVT
ACTIVE
SOT-23
DBV
5
250
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OSVI
OPA170AIDR
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
O170A
OPA170AIDRLR
ACTIVE
SOT-5X3
DRL
5
4000
Green (RoHS
& no Sb/Br)
NIPDAUAG
Level-1-260C-UNLIM
-40 to 125
DAQ
OPA170AIDRLT
ACTIVE
SOT-5X3
DRL
5
250
Green (RoHS
& no Sb/Br)
NIPDAUAG
Level-1-260C-UNLIM
-40 to 125
DAQ
OPA2170AID
ACTIVE
SOIC
D
8
75
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
2170A
OPA2170AIDCUR
ACTIVE
VSSOP
DCU
8
3000
Green (RoHS
& no Sb/Br)
NIPDAU
Level-1-260C-UNLIM
-40 to 125
OPQC
OPA2170AIDCUT
ACTIVE
VSSOP
DCU
8
250
Green (RoHS
& no Sb/Br)
NIPDAU
Level-1-260C-UNLIM
-40 to 125
OPQC
OPA2170AIDGK
ACTIVE
VSSOP
DGK
8
80
Green (RoHS
& no Sb/Br)
NIPDAUAG
Level-2-260C-1 YEAR
-40 to 125
OPNI
OPA2170AIDGKR
ACTIVE
VSSOP
DGK
8
2500
Green (RoHS
& no Sb/Br)
NIPDAUAG
Level-2-260C-1 YEAR
-40 to 125
OPNI
OPA2170AIDR
ACTIVE
SOIC
D
8
2500
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
2170A
OPA2170AIDSGR
ACTIVE
WSON
DSG
8
3000
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
1D4U
OPA2170AIDSGT
ACTIVE
WSON
DSG
8
250
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
1D4U
OPA4170AID
ACTIVE
SOIC
D
14
50
Green (RoHS
& no Sb/Br)
NIPDAU
Level-3-260C-168 HR
-40 to 125
OPA4170
OPA4170AIDR
ACTIVE
SOIC
D
14
2500
Green (RoHS
& no Sb/Br)
NIPDAU
Level-3-260C-168 HR
-40 to 125
OPA4170
OPA4170AIPW
ACTIVE
TSSOP
PW
14
90
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
-40 to 125
OPA4170
Addendum-Page 1
Samples
PACKAGE OPTION ADDENDUM
www.ti.com
Orderable Device
6-Feb-2020
Status
(1)
OPA4170AIPWR
ACTIVE
Package Type Package Pins Package
Drawing
Qty
TSSOP
PW
14
2000
Eco Plan
Lead/Ball Finish
MSL Peak Temp
(2)
(6)
(3)
Green (RoHS
& no Sb/Br)
NIPDAU
Level-2-260C-1 YEAR
Op Temp (°C)
Device Marking
(4/5)
-40 to 125
OPA4170
(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
工商网监
湘ICP备2023018690号
