®

OPA

OPA

134

OPA

134

OPA

213

OPA134
OPA2134
OPA4134

413

4

OPA

OPA

2134

4

413

4

High Performance
AUDIO OPERATIONAL AMPLIFIERSTM

FEATURESDESCRIPTION● SUPERIOR SOUND QUALITYThe OPA134 series are ultra-low distortion, low noise
operational amplifiers fully specified for audio applications. A true FET input stage was incorporated toprovide superior sound quality and speed for exceptional audio performance. This in combination withhigh output drive capability and excellent dc performance allows use in a wide variety of demanding
applications. In addition, the OPA134’s wide output
swing, to within 1V of the rails, allows increased
headroom making it ideal for use in any audio circuit.
OPA134 op amps are easy to use and free from phase
inversion and overload problems often found in common FET-input op amps. They can be operated from
±2.5V to ±18V power supplies. Input cascode circuitry provides excellent common-mode rejection andmaintains low input bias current over its wide input
voltage range, minimizing distortion. OPA134 series
op amps are unity-gain stable and provide excellent
dynamic behavior over a wide range of load conditions, including high load capacitance. The dual andquad versions feature completely independent circuitry for lowest crosstalk and freedom from interaction, even when overdriven or overloaded.
Single and dual versions are available in 8-pin DIP
and SO-8 surface-mount packages in standard configurations. The quad is available in 14-pin DIP and
SO-14 surface mount packages. All are specified for–40°C to +85°C operation. A SPICE macromodel isavailable for design analysis.

● ULTRA LOW DISTORTION: 0.00008%● LOW NOISE: 8nV/√Hz● TRUE FET-INPUT: IB = 5pA● HIGH SPEED:SLEW RATE: 20V/µs
BANDWIDTH: 8MHz
● HIGH OPEN-LOOP GAIN: 120dB (600Ω)● WIDE SUPPLY RANGE: ±2.5V to ±18V
● SINGLE, DUAL, AND QUAD VERSIONSAPPLICATIONS● PROFESSIONAL AUDIO AND MUSIC● LINE DRIVERS● LINE RECEIVERS● MULTIMEDIA AUDIO● ACTIVE FILTERS● PREAMPLIFIERS● INTEGRATORS● CROSSOVER NETWORKS

OPA4134

OPA134
Offset Trim
–In

1

8

2

7

Offset Trim
V+

V–

3

6

4

5

Output
NC

Out A

1

–In A

2

+In A

3

8-Pin DIP, SO-8

V–

A
B

4

8

V+

7

Out B

6

–In B

5
8-Pin DIP, SO-8

1

14

Out D

–In A

2

13

–In D

A

OPA2134
+In

Out A

+In B

D

+In A

3

12

+In D

V+

4

11

V–

+In B

5

10

+In C

B

C

–In B

6

9

–In C

Out B

7

8

Out C

14-Pin DIP
SO-14

International Airport Industrial Park • Mailing Address: PO Box 11400, Tucson, AZ 85734 • Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706 • Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132© 1996 Burr-Brown Corporation

PDS-1339C

Printed in U.S.A. December, 1997

SPECIFICATIONSAt TA = +25°C, VS = ±15V, unless otherwise noted.
OPA134PA, UA
OPA2134PA, UA
OPA4134PA, UA
PARAMETERCONDITION

AUDIO PERFORMANCE
Total Harmonic Distortion + NoiseIntermodulation Distortion
Headroom(1)FREQUENCY RESPONSE
Gain-Bandwidth ProductSlew Rate(2)Full Power Bandwidth
Settling Time 0.1%
0.01%
Overload Recovery TimeMIN

G = 1, f = 1kHz, VO = 3Vrms
RL = 2kΩ
RL = 600Ω
G = 1, f = 1kHz, VO = 1Vp-p
THD < 0.01%, RL = 2kΩ, VS = ±18V

±15
G = 1, 10V Step, CL = 100pF
G = 1, 10V Step, CL = 100pF(VIN) • (Gain) = VS

NOISE
Input Voltage Noise
Noise Voltage, f = 20Hz to 20kHz
Noise Density, f = 1kHz
Current Noise Density, f = 1kHzOFFSET VOLTAGE
Input Offset Voltage
vs Temperature
vs Power Supply (PSRR)
Channel Separation (Dual, Quad)
INPUT BIAS CURRENT
Input Bias Current(4)vs Temperature(3)Input Offset Current(4)INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
INPUT IMPEDANCE
Differential
Common-Mode
OPEN-LOOP GAIN
Open-Loop Voltage GainOUTPUT
Voltage Output

Output Current
Output Impedance, Closed-Loop(5)Open-Loop
Short-Circuit Current
Capacitive Load Drive (Stable Operation)
POWER SUPPLYSpecified Operating Voltage
Operating Voltage Range
Quiescent Current (per amplifier)

TA = –40°C to +85°C
TA = –40°C to +85°C
VS = ±2.5V to ±18V
dc, RL = 2kΩ
f = 20kHz, RL = 2kΩ

90

VCM =0V
VCM =0V

VCM = –12.5V to +12.5V
TA = –40°C to +85°C(V–)+2.5
86

VCM = –12.5V to +12.5V
RL = 10kΩ, VO = –14.5V to +13.8V
RL = 2kΩ, VO = –13.8V to +13.5V
RL = 600Ω, VO = –12.8V to +12.5V

104
104
104

RL = 10kΩ
RL = 2kΩ
RL = 600Ω(V–)+0.5(V–)+1.2(V–)+2.2

TYP±2.5
IO = 0

UNITS

0.00008
0.00015
–98
23.6

%
%
dB
dBu

8
±20
1.3
0.7
1
0.5

MHz
V/µs
MHz
µs
µs
µs

1.2
8
3

µVrms
nV/√HzfA/√Hz

±0.5
±1
±2
106
135
130

±2
±3(3)

mV
mV
µV/°C
dB
dB
dB

+5
See Typical Curve
±2

±100
±5
±50

pA
nA
pA

±13
100
90

(V+)–2.5

V
dB
dB

1013 || 21013 || 5Ω || pFΩ || pF

120
120
120

dB
dB
dB
(V+)–1.2(V+)–1.5(V+)–2.5

±35
0.01
10
±40
See Typical Curvef = 10kHz
f = 10kHz±15
4

TEMPERATURE RANGE
Specified Range
Operating Range
Storage
Thermal Resistance, θJA
8-Pin DIP
SO-8 Surface-Mount
14-Pin DIP
SO-14 Surface-Mount

MAX

–40
–55
–55
100
150
80
110

V
V
V
mA
Ω
Ω
mA

±18
5

V
V
mA

+85
+125
+125

°C
°C
°C
°C/W
°C/W
°C/W
°C/W

NOTES: (1) dBu = 20*log (Vrms/0.7746) where Vrms is the maximum output voltage for which THD+Noise is less than 0.01%. See THD+Noise text. (2) Guaranteedby design. (3) Guaranteed by wafer-level test to 95% confidence level. (4) High-speed test at TJ = 25°C. (5) See “Closed-Loop Output Impedance vs Frequency”
typical curve.
®

OPA134/2134/4134

2

ELECTROSTATICDISCHARGE SENSITIVITY

ABSOLUTE MAXIMUM RATINGS(1)Supply Voltage, V+ to V– .................................................................... 36V
Input Voltage .................................................... (V–) –0.7V to (V+) +0.7V
Output Short-Circuit(2) .............................................................. Continuous
Operating Temperature ................................................. –40°C to +125°C
Storage Temperature ..................................................... –55°C to +125°C
Junction Temperature ...................................................................... 150°C
Lead Temperature (soldering, 10s) ................................................. 300°C

This integrated circuit can be damaged by ESD. Burr-Brown
recommends that all integrated circuits be handled withappropriate precautions. Failure to observe proper handlingand installation procedures can cause damage.

NOTES: (1) Stresses above these ratings may cause permanent damage.
(2) Short-circuit to ground, one amplifier per package.

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.

PACKAGE/ORDERING INFORMATIONPRODUCT

PACKAGEPACKAGEDRAWINGNUMBER(1)Single
OPA134PA
OPA134UA

8-Pin Plastic DIP
SO-8 Surface-Mount

006
182

–40°C to +85°C–40°C to +85°C

Dual
OPA2134PA
OPA2134UA

8-Pin Plastic DIP
SO-8 Surface-Mount

006
182

–40°C to +85°C–40°C to +85°C

Quad
OPA4134PA
OPA4134UA

14-Pin Plastic DIP
SO-14 Surface-Mount

010
235

–40°C to +85°C–40°C to +85°C

TEMPERATURE
RANGE

NOTE: (1) For detailed drawing and dimension table, please see end of data
sheet, or Appendix C of Burr-Brown IC Data Book.

TYPICAL PERFORMANCE CURVESAt TA = +25°C, VS = ±15V, R L = 2kΩ, unless otherwise noted.

SMPTE INTERMODULATION DISTORTION
vs OUTPUT AMPLITUDETOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY

5

0.1
RL
2kΩ
600Ω

IMD (%)

THD+Noise (%)

0.01

1

0.001
G = +10

G = +1
f = 1kHzRL = 2kΩ

0.1
OPA134
OP176
0.010

OPA1340.0001Baseline

G = +1VO = 3Vrms

0.001

10k

0.000530m

0.00001
10

100

1k

100k

0.1

1

10

30

Output Amplitude (Vpp)

Frequency (Hz)The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWN assumes
no responsibility for the use of this information, and all use of such information shall be entirely at the user’s own risk. Prices and specifications are subject to change
without notice. No patent rights or licenses to any of the circuits described herein are implied or granted to any third party. BURR-BROWN does not authorize or warrant
any BURR-BROWN product for use in life support devices and/or systems.

®

3

OPA134/2134/4134

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V, R L = 2kΩ, unless otherwise noted.

HEADROOM – TOTAL HARMONIC DISTORTION+ NOISE vs OUTPUT AMPLITUDETOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
10.01

VS = ±18V
RL = 2kΩ
f = 1kHz

0.001

VS = ±160.0001

VS = ±170.010

OPA1340.001
Baseline

0.0005

100

1k

10k

20k

0.1

20

Output Amplitude (Vrms)

HARMONIC DISTORTION + NOISE vs FREQUENCYVOLTAGE NOISE vs SOURCE RESISTANCE

0.01

1k

2nd Harmonic
3rd Harmonic
0.001

Voltage Noise (nV/√Hz)

Amplitude (% of Fundamentals)

101Frequency (Hz)

00Ω

RL

0.0001=6RL

0.00001kΩ=2

OP176+
Resistor

100

10

OPA134+
Resistor

1
Resistor NoiseOnly

VO = 1Vrms
0.000001
20

OPA134

OP176

VS = ±180.00001
20

THD < 0.01%
OPA134 – 11.7Vrms
OP176 – 11.1Vrms

0.1

THD+Noise (%)

THD+Noise (%)

VO = 10Vrms
RL = 2kΩ

100

1k

10k

Vn (total) = √(inRS)2 + en2 + 4kTRS

0.1

20k

10

100

Frequency (Hz)

1k

10k

100k

1M

10M

Source Resistance (Ω)

INPUT-REFERRED NOISE VOLTAGE
vs NOISE BANDWIDTHINPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY

100

1k

Noise Voltage (µV)

Current Noise (fA/√Hz)

Voltage Noise (nV/√Hz)

RS = 20Ω

100
Voltage Noise1010
Peak-to-Peak

1
RMS

Current Noise
1

0.1
10

1

100

1k

10k

100k

1

1M

®

OPA134/2134/4134

10

100

1k

Noise Bandwidth (Hz)Frequency (Hz)

4

10k

100k

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.

OPEN-LOOP GAIN/PHASE vs FREQUENCY

CLOSED-LOOP GAIN vs FREQUENCY

160

0

50

140

40

100

φ

80

–90

60
40

–135
G

20
0

G = +100

Closed-Loop Gain (dB)–45
Phase Shift (°)

Voltage Gain (dB)

120

30
20
G = +10100
G = +1
–10

–180

–20

–20
0.1

1

10

100

1k

10k

100k

1M

1k

10M

10k

POWER SUPPLY AND COMMON-MODE REJECTIONvs FREQUENCY

10M

160
RL = ∞

100–PSR
Channel Separation (dB)

PSR, CMR (dB)

1M

CHANNEL SEPARATION vs FREQUENCY

120

80
60
40

+PSR
CMR

20
0

140

120

RL = 2kΩ

Dual and quad devices.
G = 1, all channels.
Quad measured channel
A to D or B to C—othercombinations yield improved
rejection.

100

80
10

100

1k

10k

100k

1M

100

1k

Frequency (Hz)10VS = ±5V
VS = ±2.5V

10
Closed-Loop Output Impedance (Ω)

Maximum output voltage
without slew-rate
induced distortion

20

0

100k

CLOSED-LOOP OUTPUT IMPEDANCE vs FREQUENCY

30
VS = ±15V

10k
Frequency (Hz)MAXIMUM OUTPUT VOLTAGEvs FREQUENCY

Output Voltage (Vp-p)

100k
Frequency (Hz)Frequency (Hz)Note: Open-Loop
Output Impedance
at f = 10kHz is 10Ω

10.1
G = +100

0.01

G = +100.001

G = +2G = +10.0001
10k

100k

1M

10M

10

Frequency (Hz)

100

1k

10k

100k

Frequency (Hz)®

5

OPA134/2134/4134

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V, R L = 2kΩ, unless otherwise noted.

INPUT BIAS CURRENTvs INPUT COMMON-MODE VOLTAGE

INPUT BIAS CURRENT vs TEMPERATURE
10100kHigh Speed Test
Warmed Up

9

1k
100
Dual
10
1

High Speed Test

8

Input Bias Current (pA)

Input Bias Current (pA)

10k

7
6
5
4
3
2

Single

1
0

0.1
–75

–50

–25

0

25

50

75

100

125

–15

–10

–5

0

5

10

15

Common-Mode Voltage (V)Ambient Temperature (°C)

OPEN-LOOP GAIN vs TEMPERATURE

CMR, PSR vs TEMPERATURE

150

120
RL = 600Ω
RL = 2kΩ

130

CMR, PSR (dB)

Open-Loop Gain (dB)

140

FPO

120
RL = 10kΩ

110
PSR

100

110

CMR

100

90
–75

–50

–25

0

25

50

75

100

125

–75

–50

–25

Temperature (°C)

4.3

60

25

50

75

100

125

4.2

50

OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
15
VIN = 15V

4.1

40

±ISC

30

±IQ

3.9

20

Output Voltage Swing (V)14
Short-Circuit Current (mA)

Quiescent Current Per Amp (mA)QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENTvs TEMPERATURE

4.00

Ambient Temperature (°C)

–55°C

13
12

25°C
25°C
125°C
85°C

11
10
–10

85°C

125°C

–11
–12

25°C

–13

–55°C

–14
3.8

10
–75

–50

–25

0

25

50

75

100

125

0

Ambient Temperature (°C)

10

20

30

40

Output Current (mA)®

OPA134/2134/4134

VIN = –15V

–15

6

50

60

TYPICAL PERFORMANCE CURVES (CONT)At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.

OFFSET VOLTAGE DRIFTPRODUCTION DISTRIBUTIONOFFSET VOLTAGE PRODUCTION DISTRIBUTION
12

18
Typical production
distribution of packaged
units.

14

Typical production
distribution of packaged
units.

10

Percent of Amplifiers (%)

Percent of Amplifiers (%)

16

12
10
8
6
4

8
6
4
2

2

SMALL-SIGNAL STEP RESPONSE
G =1, CL = 100pF

LARGE-SIGNAL STEP RESPONSE
G = 1, CL = 100pF

12.5

5V/div

11.5

10.5

9.5

8.5

7.5

6.5

5.5

4.5

3.5

2.5

0.5

–2000
–1800
–1600
–1400
–1200
–1000
–800
–600
–400
–200
0
200
400
600
800
1000
1200
1400
1600
1800
2000

Offset Voltage Drift (µV/°C)

50mV/div

Offset Voltage (V)200ns/div

1µs/div

SETTLING TIME vs CLOSED-LOOP GAINSMALL-SIGNAL OVERSHOOTvs LOAD CAPACITANCE

100

60
50
0.01%

10

Overshoot (%)

Settling Time (µs)

1.5

0

0

0.1%
1

40

G = +1
G = –13020G = ±10

10
0.1
±1

±10

±100

0
100pF

±1000

Closed-Loop Gain (V/V)

1nF

10nF

Load Capacitance®

7

OPA134/2134/4134

APPLICATIONS INFORMATION

V+
Trim Range: ±4mV typ

OPA134 series op amps are unity-gain stable and suitable
for a wide range of audio and general-purpose applications.
All circuitry is completely independent in the dual version,
assuring normal behavior when one amplifier in a package
is overdriven or short-circuited. Power supply pins shouldbe bypassed with 10nF ceramic capacitors or larger tominimize power supply noise.

10nF
100kΩ
7
8
3
10nF

OPERATING VOLTAGE
OPA134 series op amps operate with power supplies from
±2.5V to ±18V with excellent performance. Althoughspecifications are production tested with ±15V supplies,
most behavior remains unchanged throughout the fulloperating voltage range. Parameters which vary significantly with operating voltage are shown in the typicalperformance curves.

OPA134

6
OPA134 single op amp only.
Use offset adjust pins only to null
offset voltage of op amp—see text.

4

V–

FIGURE 1. OPA134 Offset Voltage Trim Circuit.
In many ways headroom is a subjective measurement. It canbe thought of as the maximum output amplitude allowed
while still maintaining a very low level of distortion. In an
attempt to quantify headroom, we have defined “very low
distortion” as 0.01%. Headroom is expressed as a ratio
which compares the maximum allowable output voltage
level to a standard output level (1mW into 600Ω, or
0.7746Vrms). Therefore, OPA134 series op amps, whichhave a maximum allowable output voltage level of 11.7Vrms(THD+Noise < 0.01%), have a headroom specification of
23.6dBu. See the typical curve “Headroom - Total Harmonic
Distortion + Noise vs Output Amplitude.”

OFFSET VOLTAGE TRIM
Offset voltage of OPA134 series amplifiers is laser trimmed
and usually requires no user adjustment. The OPA134(single op amp version) provides offset trim connections
on pins 1 and 8, identical to 5534 amplifiers. Offset
voltage can be adjusted by connecting a potentiometer asshown in Figure 1. This adjustment should be used only tonull the offset of the op amp, not to adjust system offset or
offset produced by the signal source. Nulling offset couldchange the offset voltage drift behavior of the op amp.
While it is not possible to predict the exact change in drift,
the effect is usually small.

DISTORTION MEASUREMENTS
The distortion produced by OPA134 series op amps is below
the measurement limit of all known commercially available
equipment. However, a special test circuit can be used toextend the measurement capabilities.

TOTAL HARMONIC DISTORTION
OPA134 series op amps have excellent distortion characteristics. THD+Noise is below 0.0004% throughout the audio
frequency range, 20Hz to 20kHz, with a 2kΩ load. In
addition, distortion remains relatively flat through its
wide output voltage swing range, providing increased headroom compared to other audio amplifiers, including theOP176/275.

R1

1

2

Op amp distortion can be considered an internal error source
which can be referred to the input. Figure 2 shows acircuit which causes the op amp distortion to be 101 times
greater than normally produced by the op amp. The additionof R3 to the otherwise standard non-inverting amplifier

R2
SIG. DIST.
GAIN GAIN

R1

R2

R3

101

∞

1kΩ

10Ω

11

101

100Ω

1kΩ

11Ω

101

101

10Ω

1kΩ

∞

1
R3
Signal Gain = 1+

OPA134VO = 3Vrms

R2
R1

Distortion Gain = 1+

R2
R1 II R3

Generator
OutputAnalyzer
Input

Audio Precision
System One
Analyzer(1)RL
1kΩ

NOTE: (1) Measurement BW = 80kHz

FIGURE 2. Distortion Test Circuit.
®

OPA134/2134/4134

8

IBM PCorCompatibleconfiguration alters the feedback factor or noise gain of thecircuit. The closed-loop gain is unchanged, but the feedback
available for error correction is reduced by a factor of 101,
thus extending the resolution by 101. Note that the input
signal and load applied to the op amp are the same as withconventional feedback without R3. The value of R3 should
be kept small to minimize its effect on the distortion measurements.
Validity of this technique can be verified by duplicating
measurements at high gain and/or high frequency where thedistortion is within the measurement capability of the test
equipment. Measurements for this data sheet were madewith an Audio Precision distortion/noise analyzer which
greatly simplifies such repetitive measurements. The measurement technique can, however, be performed with manual
distortion measurement instruments.

NOISE PERFORMANCE
Circuit noise is determined by the thermal noise of external
resistors and op amp noise. Op amp noise is described by
two parameters—noise voltage and noise current. The totalnoise is quantified by the equation:
Vn (total) = (i n R S )2 + e n 2 + 4 kTR s

With low source impedance, the current noise term is
insignificant and voltage noise dominates the noise performance. At high source impedance, the current noise term
becomes the dominant contributor.
Low noise bipolar op amps such as the OPA27 and OPA37
provide very low voltage noise at the expense of a higher
current noise. However, OPA134 series op amps are uniquein providing very low voltage noise and very low current
noise. This provides optimum noise performance over awide range of sources, including reactive source impedances, refer to the typical curve, “Voltage Noise vs Source
Resistance.” Above 2kΩ source resistance, the op amp
contributes little additional noise—the voltage and current
terms in the total noise equation become insignificant andthe source resistance term dominates. Below 2kΩ, op amp
voltage noise dominates over the resistor noise, but compares favorably with other audio op amps such as OP176.

SOURCE IMPEDANCE AND DISTORTION
For lowest distortion with a source or feedback network
which has an impedance greater than 2kΩ, the impedance
seen by the positive and negative inputs in noninverting
applications should be matched. The p-channel JFETs in the
FET input stage exhibit a varying input capacitance withapplied common-mode input voltage. In inverting configurations the input does not vary with input voltage since theinverting input is held at virtual ground. However, innoninverting applications the inputs do vary, and the gateto-source voltage is not constant. The effect is increased
distortion due to the varying capacitance for unmatchedsource impedances greater than 2kΩ.
To maintain low distortion, match unbalanced source impedance with appropriate values in the feedback network as
shown in Figure 3. Of course, the unbalanced impedance
may be from gain-setting resistors in the feedback path. If
the parallel combination of R1 and R2 is greater than 2kΩ, amatching impedance on the noninverting input should be
used. As always, resistor values should be minimized toreduce the effects of thermal noise.

R1

PHASE REVERSAL PROTECTION
OPA134 series op amps are free from output phase-reversal
problems. Many audio op amps, such as OP176, exhibit
phase-reversal of the output when the input common-mode
voltage range is exceeded. This can occur in voltage-follower circuits, causing serious problems in control loop
applications. OPA134 series op amps are free from thisundesirable behavior even with inputs of 10V beyond the
input common-mode range.
POWER DISSIPATIONOPA134 series op amps are capable of driving 600Ω loads
with power supply voltage up to ±18V. Internal power
dissipation is increased when operating at high supply
voltages. Copper leadframe construction used in OPA134
series op amps improves heat dissipation compared to conventional materials. Circuit board layout can also help
minimize junction temperature rise. Wide copper traces help
dissipate the heat by acting as an additional heat sink.
Temperature rise can be further minimized by soldering thedevices to the circuit board rather than using a socket.

R2

OPA134VOUT

VIN

OUTPUT CURRENT LIMIT
Output current is limited by internal circuitry to approximately ±40mA at 25°C. The limit current decreases withincreasing temperature as shown in the typical performance
curve “Short-Circuit Current vs Temperature.”

If RS > 2kΩ or R1 II R2 > 2kΩ
RS = R1 II R2

FIGURE 3. Impedance Matching for Maintaining Low
Distortion in Non-Inverting Circuits.

®

9

OPA134/2134/4134

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