OPA2134 [BB]
High Performance AUDIO OPERATIONAL AMPLIFIERS TM; 高性能音频运算放大器TM
| 型号： | OPA2134 |
| 厂家： | 
BURR-BROWN CORPORATION |
| 描述： | High Performance AUDIO OPERATIONAL AMPLIFIERS TM |
| 文件： | 总9页 (文件大小：330K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
®
OPA134
OPA2134
OPA134
OPA2134
OPA4134
OPA4134
OPA134
OPA2134
OPA4134
TM
High Performance
AUDIO OPERATIONAL AMPLIFIERS
FEATURES
● SUPERIOR SOUND QUALITY
● ULTRA LOW DISTORTION: 0.00008%
● LOW NOISE: 8nV/√Hz
DESCRIPTION
The OPA134 series are ultra-low distortion, low noise
operational amplifiers fully specified for audio appli-
cations. A true FET input stage was incorporated to
provide superior sound quality and speed for excep-
tional audio performance. This in combination with
high output drive capability and excellent dc perfor-
mance 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.
● 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
OPA134 op amps are easy to use and free from phase
inversion and overload problems often found in com-
mon FET-input op amps. They can be operated from
±2.5V to ±18V power supplies. Input cascode cir-
cuitry 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 condi-
tions, including high load capacitance. The dual and
quad versions feature completely independent cir-
cuitry for lowest crosstalk and freedom from interac-
tion, even when overdriven or overloaded.
APPLICATIONS
● PROFESSIONAL AUDIO AND MUSIC
● LINE DRIVERS
● LINE RECEIVERS
● MULTIMEDIA AUDIO
● ACTIVE FILTERS
Single and dual versions are available in 8-pin DIP
and SO-8 surface-mount packages in standard con-
figurations. 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.
● PREAMPLIFIERS
● INTEGRATORS
● CROSSOVER NETWORKS
OPA4134
OPA134
Out A
–In A
+In A
V+
1
2
3
4
5
6
7
14 Out D
13 –In D
12 +In D
11 V–
Offset Trim
1
2
3
4
8
7
6
5
Offset Trim
V+
–In
+In
V–
A
B
D
C
OPA2134
Output
Out A
1
2
3
4
8
7
6
5
V+
NC
+In B
–In B
Out B
10 +In C
A
–In A
+In A
V–
Out B
–In B
+In B
8-Pin DIP, SO-8
9
8
–In C
Out C
B
14-Pin DIP
SO-14
8-Pin DIP, SO-8
International Airport Industrial Park
•
Mailing Address: PO Box 11400, Tucson, AZ 85734
FAXLine: (800) 548-6133 (US/Canada Only)
•
Street Address: 6730 S. Tucson Blvd., Tucson, AZ 85706
•
Tel: (520) 746-1111 • Twx: 910-952-1111
Internet: http://www.burr-brown.com/
•
•
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
MIN
TYP
MAX
UNITS
AUDIO PERFORMANCE
Total Harmonic Distortion + Noise
G = 1, f = 1kHz, VO = 3Vrms
RL = 2kΩ
0.00008
0.00015
–98
%
%
dB
dBu
RL = 600Ω
G = 1, f = 1kHz, VO = 1Vp-p
THD < 0.01%, RL = 2kΩ, VS = ±18V
Intermodulation Distortion
Headroom(1)
23.6
FREQUENCY RESPONSE
Gain-Bandwidth Product
Slew Rate(2)
Full Power Bandwidth
Settling Time 0.1%
0.01%
8
MHz
V/µs
MHz
µs
µs
µs
±15
±20
1.3
0.7
1
G = 1, 10V Step, CL = 100pF
G = 1, 10V Step, CL = 100pF
(VIN) • (Gain) = VS
Overload Recovery Time
0.5
NOISE
Input Voltage Noise
Noise Voltage, f = 20Hz to 20kHz
Noise Density, f = 1kHz
Current Noise Density, f = 1kHz
1.2
8
3
µVrms
nV/√Hz
fA/√Hz
OFFSET VOLTAGE
Input Offset Voltage
±0.5
±1
±2
106
135
130
±2
±3(3)
mV
mV
µV/°C
dB
dB
dB
TA = –40°C to +85°C
TA = –40°C to +85°C
VS = ±2.5V to ±18V
dc, RL = 2kΩ
vs Temperature
vs Power Supply (PSRR)
Channel Separation (Dual, Quad)
90
f = 20kHz, RL = 2kΩ
INPUT BIAS CURRENT
Input Bias Current(4)
vs Temperature(3)
VCM =0V
VCM =0V
+5
See Typical Curve
±2
±100
±5
±50
pA
nA
pA
Input Offset Current(4)
INPUT VOLTAGE RANGE
Common-Mode Voltage Range
Common-Mode Rejection
(V–)+2.5
86
±13
100
90
(V+)–2.5
V
dB
dB
VCM = –12.5V to +12.5V
TA = –40°C to +85°C
INPUT IMPEDANCE
Differential
Common-Mode
1013 || 2
1013 || 5
Ω || pF
Ω || pF
VCM = –12.5V to +12.5V
OPEN-LOOP GAIN
Open-Loop Voltage Gain
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
120
120
120
dB
dB
dB
OUTPUT
Voltage Output
RL = 10kΩ
RL = 2kΩ
RL = 600Ω
(V–)+0.5
(V–)+1.2
(V–)+2.2
(V+)–1.2
(V+)–1.5
(V+)–2.5
V
V
V
Output Current
±35
0.01
10
±40
mA
Ω
Ω
Output Impedance, Closed-Loop(5)
f = 10kHz
f = 10kHz
Open-Loop
Short-Circuit Current
mA
Capacitive Load Drive (Stable Operation)
See Typical Curve
POWER SUPPLY
Specified Operating Voltage
Operating Voltage Range
Quiescent Current (per amplifier)
±15
V
V
mA
±2.5
±18
5
IO = 0
4
TEMPERATURE RANGE
Specified Range
Operating Range
Storage
–40
–55
–55
+85
+125
+125
°C
°C
°C
Thermal Resistance, θJA
8-Pin DIP
SO-8 Surface-Mount
14-Pin DIP
100
150
80
°C/W
°C/W
°C/W
°C/W
SO-14 Surface-Mount
110
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.
®
2
OPA134/2134/4134
ABSOLUTE MAXIMUM RATINGS(1)
ELECTROSTATIC
DISCHARGE SENSITIVITY
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.
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
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 degrada-
tion 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
PACKAGE
DRAWING TEMPERATURE
PRODUCT
PACKAGE
NUMBER(1)
RANGE
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
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, RL = 2kΩ, unless otherwise noted.
SMPTE INTERMODULATION DISTORTION
vs OUTPUT AMPLITUDE
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
0.1
5
G = +1
f = 1kHz
RL = 2kΩ
RL
2kΩ
600Ω
1
0.01
0.1
OPA134
OP176
0.001
G = +10
0.010
OPA134
0.0001
Baseline
0.001
G = +1
VO = 3Vrms
0.0005
0.00001
30m
10
30
0.1
1
10
100
1k
10k
100k
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, RL = 2kΩ, unless otherwise noted.
HEADROOM – TOTAL HARMONIC DISTORTION
+ NOISE vs OUTPUT AMPLITUDE
TOTAL HARMONIC DISTORTION + NOISE
vs FREQUENCY
0.01
0.001
1
0.1
VS = ±18V
RL = 2kΩ
f = 1kHz
THD < 0.01%
OPA134 – 11.7Vrms
OP176 – 11.1Vrms
VO = 10Vrms
RL = 2kΩ
VS = ±16
0.010
OPA134
Baseline
0.0001
0.00001
OPA134
OP176
0.001
VS = ±17
100
VS = ±18
0.0005
20
1k
Frequency (Hz)
10k 20k
0.1
10
20
1
Output Amplitude (Vrms)
HARMONIC DISTORTION + NOISE vs FREQUENCY
VOLTAGE NOISE vs SOURCE RESISTANCE
0.01
1k
100
10
2nd Harmonic
3rd Harmonic
OP176+
Resistor
0.001
0.0001
Ω
L = 600
R
OPA134+
Resistor
Ω
L = 2k
R
0.00001
0.000001
1
Resistor Noise
VO = 1Vrms
Vn (total) = √(inRS)2 + en2 + 4kTRS
Only
0.1
20
100
1k
10k 20k
10
100
1k
10k
100k
1M
10M
Frequency (Hz)
Source Resistance (Ω)
INPUT-REFERRED NOISE VOLTAGE
vs NOISE BANDWIDTH
INPUT VOLTAGE AND CURRENT NOISE
SPECTRAL DENSITY vs FREQUENCY
100
10
1
1k
RS = 20Ω
100
Peak-to-Peak
RMS
Voltage Noise
10
1
Current Noise
0.1
1
10
100
1k
10k
100k
1
10
100
1k
10k
100k
1M
Noise Bandwidth (Hz)
Frequency (Hz)
®
4
OPA134/2134/4134
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
140
120
100
80
0
50
40
G = +100
–45
–90
–135
–180
30
φ
20
G = +10
G = +1
60
10
40
0
G
20
–10
–20
0
–20
0.1
1
10
100
1k
10k 100k
1M
10M
1k
10k
100k
1M
10M
Frequency (Hz)
Frequency (Hz)
POWER SUPPLY AND COMMON-MODE REJECTION
vs FREQUENCY
CHANNEL SEPARATION vs FREQUENCY
RL = ∞
120
100
80
60
40
20
0
160
–PSR
140
120
100
80
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.
+PSR
CMR
10
100
1k
10k
100k
1M
100
1k
10k
100k
Frequency (Hz)
Frequency (Hz)
MAXIMUM OUTPUT VOLTAGE
vs FREQUENCY
CLOSED-LOOP OUTPUT IMPEDANCE vs FREQUENCY
30
20
10
0
10
Maximum output voltage
without slew-rate
Note: Open-Loop
Output Impedance
at f = 10kHz is 10Ω
VS = ±15V
induced distortion
1
0.1
0.01
G = +100
VS = ±5V
G = +10
G = +2
G = +1
0.001
0.0001
VS = ±2.5V
10k
100k
Frequency (Hz)
1M
10M
10
100
1k
10k
100k
Frequency (Hz)
®
5
OPA134/2134/4134
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.
INPUT BIAS CURRENT
INPUT BIAS CURRENT vs TEMPERATURE
vs INPUT COMMON-MODE VOLTAGE
10
9
8
7
6
5
4
3
2
1
0
100k
10k
1k
High Speed Test
Warmed Up
High Speed Test
100
10
Dual
1
Single
0.1
–75
–50
–25
0
25
50
75
100
125
–15
–10
–5
0
5
10
15
Ambient Temperature (°C)
Common-Mode Voltage (V)
OPEN-LOOP GAIN vs TEMPERATURE
CMR, PSR vs TEMPERATURE
150
140
130
120
110
100
120
110
100
90
RL = 600Ω
RL = 2kΩ
PSR
FPO
RL = 10kΩ
CMR
–75
–50
–25
0
25
50
75
100
125
–75
–50
–25
0
25
50
75
100
125
Temperature (°C)
Ambient Temperature (°C)
QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT
vs TEMPERATURE
OUTPUT VOLTAGE SWING vs OUTPUT CURRENT
4.3
4.2
4.1
4.0
3.9
3.8
60
50
40
30
20
10
15
14
13
12
11
10
VIN = 15V
–55°C
25°C
125°C
±ISC
85°C
–10
–11
–12
–13
–14
–15
85°C
±IQ
125°C
–55°C
25°C
VIN = –15V
10
–75
–50
–25
0
25
50
75
100
125
0
20
30
40
50
60
Ambient Temperature (°C)
Output Current (mA)
®
6
OPA134/2134/4134
TYPICAL PERFORMANCE CURVES (CONT)
At TA = +25°C, VS = ±15V, RL = 2kΩ, unless otherwise noted.
OFFSET VOLTAGE DRIFT
OFFSET VOLTAGE PRODUCTION DISTRIBUTION
PRODUCTION DISTRIBUTION
18
16
14
12
10
8
12
10
8
Typical production
distribution of packaged
units.
Typical production
distribution of packaged
units.
6
6
4
4
2
2
0
0
Offset Voltage Drift (µV/°C)
Offset Voltage (V)
LARGE-SIGNAL STEP RESPONSE
G = 1, CL = 100pF
SMALL-SIGNAL STEP RESPONSE
G =1, CL = 100pF
1µs/div
200ns/div
SMALL-SIGNAL OVERSHOOT
vs LOAD CAPACITANCE
SETTLING TIME vs CLOSED-LOOP GAIN
100
10
1
60
50
40
30
20
10
0
G = +1
0.01%
G = –1
0.1%
G = ±10
0.1
±1
±10
±100
±1000
100pF
1nF
10nF
Closed-Loop Gain (V/V)
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
1
2
3
8
6
OPA134
OPA134 single op amp only.
Use offset adjust pins only to null
offset voltage of op amp—see text.
4
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 signifi-
cantly with operating voltage are shown in the typical
performance curves.
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 character-
istics. 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 head-
room compared to other audio amplifiers, including the
OP176/275.
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
R1
R2
SIG. DIST.
R1
R2
R3
10Ω
11Ω
∞
GAIN GAIN
1
101
∞
1kΩ
11
101 100Ω 1kΩ
101 10Ω 1kΩ
R3
OPA134
VO = 3Vrms
101
R2
R1
Signal Gain = 1+
R2
Distortion Gain = 1+
R1 II R3
Generator
Output
Analyzer
Input
Audio Precision
System One
Analyzer(1)
IBM PC
or
Compatible
RL
1kΩ
NOTE: (1) Measurement BW = 80kHz
FIGURE 2. Distortion Test Circuit.
®
8
OPA134/2134/4134
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 mea-
surements.
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) = (inRS)2 + en + 4kTRs
2
With low source impedance, the current noise term is
insignificant and voltage noise dominates the noise perfor-
mance. At high source impedance, the current noise term
becomes the dominant contributor.
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 mea-
surement technique can, however, be performed with manual
distortion measurement instruments.
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 imped-
ances, 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 com-
pares 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 configu-
rations 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 gate-
to-source voltage is not constant. The effect is increased
distortion due to the varying capacitance for unmatched
source impedances greater than 2kΩ.
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-fol-
lower 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.
To maintain low distortion, match unbalanced source im-
pedance 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.
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 con-
ventional 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.
R1
R2
VOUT
OPA134
VIN
OUTPUT CURRENT LIMIT
Output current is limited by internal circuitry to approxi-
mately ±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
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