BB OPA134PA

®
OPA
OPA
134
OPA
134
OPA
213
OPA134
OPA2134
OPA4134
413
4
OPA
OPA
2134
4
413
4
High Performance
AUDIO OPERATIONAL AMPLIFIERS
TM
FEATURES
DESCRIPTION
● SUPERIOR SOUND QUALITY
The OPA134 series are ultra-low distortion, low noise
operational amplifiers fully specified for audio applications. A true FET input stage was incorporated to
provide superior sound quality and speed for exceptional audio performance. This in combination with
high 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 and
maintains 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 and
quad 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 is
available 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 VERSIONS
APPLICATIONS
● 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
SPECIFICATIONS
At TA = +25°C, VS = ±15V, unless otherwise noted.
OPA134PA, UA
OPA2134PA, UA
OPA4134PA, UA
PARAMETER
CONDITION
AUDIO PERFORMANCE
Total Harmonic Distortion + Noise
Intermodulation Distortion
Headroom(1)
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate(2)
Full Power Bandwidth
Settling Time 0.1%
0.01%
Overload Recovery Time
MIN
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 = 1kHz
OFFSET 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 Gain
OUTPUT
Voltage Output
Output Current
Output Impedance, Closed-Loop(5)
Open-Loop
Short-Circuit Current
Capacitive Load Drive (Stable Operation)
POWER SUPPLY
Specified 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/√Hz
fA/√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 || 2
1013 || 5
Ω || pF
Ω || pF
120
120
120
dB
dB
dB
(V+)–1.2
(V+)–1.5
(V+)–2.5
±35
0.01
10
±40
See Typical Curve
f = 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) Guaranteed
by 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
ELECTROSTATIC
DISCHARGE 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 with
appropriate precautions. Failure to observe proper handling
and 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 INFORMATION
PRODUCT
PACKAGE
PACKAGE
DRAWING
NUMBER(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 CURVES
At TA = +25°C, VS = ±15V, R L = 2kΩ, unless otherwise noted.
SMPTE INTERMODULATION DISTORTION
vs OUTPUT AMPLITUDE
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
5
0.1
RL
2kΩ
600Ω
IMD (%)
THD+Noise (%)
0.01
1
0.001
G = +10
G = +1
f = 1kHz
RL = 2kΩ
0.1
OPA134
OP176
0.010
OPA134
0.0001
Baseline
G = +1
VO = 3Vrms
0.001
0.0005
30m
0.00001
10
100
1k
10k
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 AMPLITUDE
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
1
0.01
VS = ±18V
RL = 2kΩ
f = 1kHz
0.001
VS = ±16
0.0001
VS = ±17
0.010
OPA134
0.001
Baseline
0.0005
100
1k
10k
20k
0.1
20
Output Amplitude (Vrms)
HARMONIC DISTORTION + NOISE vs FREQUENCY
VOLTAGE NOISE vs SOURCE RESISTANCE
0.01
1k
2nd Harmonic
3rd Harmonic
0.001
Voltage Noise (nV/√Hz)
Amplitude (% of Fundamentals)
10
1
Frequency (Hz)
00Ω
RL
0.0001
=6
RL
0.00001
kΩ
=2
OP176+
Resistor
100
10
OPA134+
Resistor
1
Resistor Noise
Only
VO = 1Vrms
0.000001
20
OPA134
OP176
VS = ±18
0.00001
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 BANDWIDTH
INPUT 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 Noise
10
10
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 = +10
10
0
G = +1
–10
–180
–20
–20
0.1
1
10
100
1k
10k
100k
1M
1k
10M
10k
POWER SUPPLY AND COMMON-MODE REJECTION
vs 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—other
combinations yield improved
rejection.
100
80
10
100
1k
10k
100k
1M
100
1k
Frequency (Hz)
10
VS = ±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 VOLTAGE
vs FREQUENCY
Output Voltage (Vp-p)
100k
Frequency (Hz)
Frequency (Hz)
Note: Open-Loop
Output Impedance
at f = 10kHz is 10Ω
1
0.1
G = +100
0.01
G = +10
0.001
G = +2
G = +1
0.0001
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 CURRENT
vs INPUT COMMON-MODE VOLTAGE
INPUT BIAS CURRENT vs TEMPERATURE
10
100k
High 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 CURRENT
vs TEMPERATURE
4.0
0
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 DRIFT
PRODUCTION DISTRIBUTION
OFFSET 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 GAIN
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
100
60
50
0.01%
10
Overshoot (%)
Settling Time (µs)
1.5
0
0
0.1%
1
40
G = +1
G = –1
30
20
G = ±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 should
be bypassed with 10nF ceramic capacitors or larger to
minimize 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. Although
specifications are production tested with ±15V supplies,
most behavior remains unchanged throughout the full
operating voltage range. Parameters which vary significantly with operating voltage are shown in the typical
performance 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 can
be 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, which
have 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 as
shown in Figure 1. This adjustment should be used only to
null the offset of the op amp, not to adjust system offset or
offset produced by the signal source. Nulling offset could
change 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 to
extend 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 the
OP176/275.
R1
1
2
Op amp distortion can be considered an internal error source
which can be referred to the input. Figure 2 shows a
circuit which causes the op amp distortion to be 101 times
greater than normally produced by the op amp. The addition
of 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+
OPA134
VO = 3Vrms
R2
R1
Distortion Gain = 1+
R2
R1 II R3
Generator
Output
Analyzer
Input
Audio Precision
System One
Analyzer(1)
RL
1kΩ
NOTE: (1) Measurement BW = 80kHz
FIGURE 2. Distortion Test Circuit.
®
OPA134/2134/4134
8
IBM PC
or
Compatible
configuration alters the feedback factor or noise gain of the
circuit. 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 with
conventional 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 the
distortion is within the measurement capability of the test
equipment. Measurements for this data sheet were made
with 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 total
noise 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 unique
in providing very low voltage noise and very low current
noise. This provides optimum noise performance over a
wide 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 and
the 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 with
applied common-mode input voltage. In inverting configurations the input does not vary with input voltage since the
inverting input is held at virtual ground. However, in
noninverting applications the inputs do vary, and the gateto-source voltage is not constant. The effect is increased
distortion due to the varying capacitance for unmatched
source 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, a
matching impedance on the noninverting input should be
used. As always, resistor values should be minimized to
reduce 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 this
undesirable behavior even with inputs of 10V beyond the
input common-mode range.
POWER DISSIPATION
OPA134 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 the
devices to the circuit board rather than using a socket.
R2
OPA134
VOUT
VIN
OUTPUT CURRENT LIMIT
Output current is limited by internal circuitry to approximately ±40mA at 25°C. The limit current decreases with
increasing 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