®
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.
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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)
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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
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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.
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OPA134/2134/4134
