Low Power, Precision FET-INPUT OPERATIONAL AMPLIFIERS
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1 OPA3 OPA3 OPA3 OPA3 OPA3 OPA3 OPA3 OPA3 OPA3 Low Power, Precision FET-INPUT OPERATIONAL AMPLIFIERS FEATURES LOW QUIESCENT CURRENT: 3µA/amp OPA3 LOW OFFSET VOLTAGE: mv max HIGH OPEN-LOOP GAIN: db min HIGH CMRR: 9dB min FET INPUT: I B = pa max EXCELLENT BANDWIDTH: MHz WIDE SUPPLY RANGE: ±. to ±8V Offset Trim In +In V 3 8-Pin DIP, SO NC V+ Output Offset Trim SINGLE, DUAL, AND QUAD VERSIONS DESCRIPTION OPA3 The OPA3 series of FET-input op amps combine precision dc performance with low quiescent current. Single, dual, and quad versions have identical specifications for maximum design flexibility. They are ideal for general-purpose, portable, and battery operated applications, especially with high source impedance. OPA3 op amps are easy to use and free from phase inversion and overload problems often found in common FET-input op amps. Input cascode circuitry provides excellent common-mode rejection and maintains low input bias current over its wide input voltage range. OPA3 series op amps are stable in unity gain and provide excellent dynamic behavior over a wide range of load conditions, including high load capacitance. Dual and quad designs 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. Quad is available in -pin DIP and SO- surface-mount packages. All are specified for C to +8 C operation. Out A In A +In A V Out A In A +In A 3 V+ +In B In B Out B 7 3 A B 8-Pin DIP, SO-8 A B OPA3 -Pin DIP SO- D C 8 7 V+ Out B In B +In B Out D 3 In D +In D V +In C 9 In C 8 Out C International Airport Industrial Park Mailing Address: PO Box, Tucson, AZ 873 Street Address: 73 S. Tucson Blvd., Tucson, AZ 87 Tel: () 7- Twx: 9-9- Internet: FAXLine: (8) 8-33 (US/Canada Only) Cable: BBRCORP Telex: -9 FAX: () 889- Immediate Product Info: (8) Burr-Brown Corporation PDS-98B Printed in U.S.A. May, 998
2 SPECIFICATIONS At T A = + C, V S = ±V, and R L = kω, unless otherwise noted. OPA3PA, UA OPA3PA, UA OPA3PA, UA PARAMETER CONDITION MIN TYP MAX UNITS OFFSET VOLTAGE Input Offset Voltage ±. ± mv vs Temperature () Operating Temperature Range ± ± µv/ C vs Power Supply V S = ±.V to ±8V µv/v Channel Separation (dual and quad).3 µv/v INPUT BIAS CURRENT () Input Bias Current V CM = V + ± pa vs Temperature See Typical Curve Input Offset Current V CM = V ± ± pa NOISE Input Voltage Noise Noise Density, f = Hz 3 nv/ Hz f = Hz 8 nv/ Hz f = khz nv/ Hz f = khz nv/ Hz Current Noise Density, f = khz fa/ Hz INPUT VOLTAGE RANGE Common-Mode Voltage Range, Positive (V+) (V+). V Negative (V )+ (V )+. V Common-Mode Rejection V CM = 3V to +3V 9 db INPUT IMPEDANCE Differential 3 Ω pf Common-Mode V CM = 3V to +3V 3 3 Ω pf OPEN-LOOP GAIN Open-loop Voltage Gain V O = 3.8V to +3V 3 db R L = kω, V O = 3V to +V 3 db FREQUENCY RESPONSE Gain-Bandwidth Product MHz Slew Rate V/µs Settling Time:.% G =, V Step, C L = pf. µs.% G =, V Step, C L = pf 7 µs Overload Recovery Time G =, V IN = ±V µs Total Harmonic Distortion + Noise khz, G =, V O = 3.Vrms.3 % OUTPUT Voltage Output, Positive (V+) (V+). V Negative (V )+. (V )+ V Positive R L = kω (V+) 3 (V+). V Negative R L = kω (V )+ (V )+. V Short-Circuit Current ±8 ma Capacitive Load Drive (Stable Operation) nf POWER SUPPLY Specified Operating Voltage ± V Operating Voltage Range ±. ±8 V Quiescent Current (per amplifier) I O = ±3 ± µa TEMPERATURE RANGE Operating Range +8 C Storage + C Thermal Resistance, θ JA 8-Pin DIP C/W SO-8 Surface-Mount C/W -Pin DIP 8 C/W SO- Surface-Mount C/W NOTES: () Guaranteed by wafer test. () High-speed test at T J = C. 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. OPA3, 3, 3
3 ABSOLUTE MAXIMUM RATINGS Supply Voltage, V+ to V... 3V Input Voltage... (V ).7V to (V+) +.7V Output Short-Circuit ()... Continuous Operating Temperature... C to + C Storage Temperature... C to + C Junction Temperature... C Lead Temperature (soldering, s)... 3 C NOTE: () Short-circuit to ground, one amplifier per package. PACKAGE/ORDERING INFORMATION PACKAGE DRAWING TEMPERATURE PRODUCT PACKAGE NUMBER () RANGE 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. 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. Single OPA3PA 8-Pin Plastic DIP C to +8 C OPA3UA SO-8 Surface-Mount 8 C to +8 C Dual OPA3PA 8-Pin Plastic DIP C to +8 C OPA3UA SO-8 Surface-Mount 8 C to +8 C Quad OPA3PA -Pin Plastic DIP C to +8 C OPA3UA SO- Surface-Mount 3 C to +8 C NOTE: () For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. 3 OPA3, 3, 3
4 TYPICAL PERFORMANCE CURVES At T A = + C, V S = ±V, and R L = kω, unless otherwise noted. Voltage Gain (db) 8 OPEN-LOOP GAIN/PHASE vs FREQUENCY C L = pf φ G k k k M M Phase Shift ( ) PSR, CMR (db) POWER SUPPLY AND COMMON-MODE REJECTION vs FREQUENCY +PSR CMR PSR k k k M k INPUT VOLTAGE AND CURRENT NOISE SPECTRAL DENSITY vs FREQUENCY k CHANNEL SEPARATION vs FREQUENCY Voltage Noise (nv/ Hz) Voltage Noise Current Noise k k k M Current Noise (fa/ Hz) Channel Separation (db) Dual and quad devices. G =, all channels. Quad measured channel A to D or B to C other R L = kω combinations yield improved rejection. 8 k k k Input Bias and Input Offset Current (pa) k k. INPUT BIAS AND INPUT OFFSET CURRENT vs TEMPERATURE V CM = V. 7 7 I B Ambient Temperature ( C) I OS Input Bias Current (pa) INPUT BIAS CURRENT vs INPUT COMMON-MODE VOLTAGE Common-Mode Voltage (V) OPA3, 3, 3
5 TYPICAL PERFORMANCE CURVES (CONT) At T A = + C, V S = ±V, and R L = kω, unless otherwise noted. A OL, CMR, PSR vs TEMPERATURE. QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT vs TEMPERATURE A OL, CMR, PSR (db) 3 CMR PSR Open-Loop Gain 7 7 Ambient Temperature ( C) Quiescent Current Per Amp (ma) I SC I SC I Q Temperature ( C) 3 3 Short-Circuit Current (ma) OFFSET VOLTAGE PRODUCTION DISTRIBUTION OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 8 Percent of Amplifiers (%) Percent of Amplifiers (%) Offset Voltage (µv) Offset Voltage Drift (µv/ C). TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY 3 MAXIMUM OUTPUT VOLTAGE vs FREQUENCY THD + Noise (%).. G = + G = + R L = kω R L = kω Output Voltage (Vp-p) V S = ±V V S = ±.V V S = ±V Maximum output voltage without slew-rate induced distortion. k k k k k M OPA3, 3, 3
6 TYPICAL PERFORMANCE CURVES (CONT) At T A = + C, V S = ±V, and R L = kω, unless otherwise noted. SMALL-SIGNAL STEP RESPONSE G =, C L = pf SMALL-SIGNAL STEP RESPONSE G =, C L = pf mv/div mv/div ns/div µs/div LARGE-SIGNAL STEP RESPONSE G =, C L = pf SETTLING TIME vs GAIN.% V/div Settling Time (µs).% µs/div ± ± ± Gain (V/V) Output Voltage Swing (V) 3 3 OUTPUT VOLTAGE SWING vs OUTPUT CURRENT + C + C + C + C C +8 C C ± ± ± ± Output Current (ma) Overshoot (%) SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE G = + G = G = ± pf pf nf nf nf Load Capacitance (F) OPA3, 3, 3
7 APPLICATIONS INFORMATION OPA3 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. Power supply pins should be bypassed with nf ceramic capacitors or larger. OPA3 op amps are free from unexpected output phasereversal common with FET op amps. Many FET-input op amps 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. OPA3 series op amps are free from this undesirable behavior. All circuitry is completely independent in dual and quad versions, assuring normal behavior when one amplifier in a package is overdriven or short-circuited. OPERATING VOLTAGE OPA3 series op amps operate with power supplies from ±.V to ±8V with excellent performance. Although specifications are production tested with ±V 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. OFFSET VOLTAGE TRIM Offset voltage of OPA3 series amplifiers is laser trimmed and usually requires no user adjustment. The OPA3 (single op amp version) provides offset voltage trim connections on pins and. Offset voltage can be adjusted by connecting a potentiometer as shown in Figure. 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 that is not produced by the amplifier will change the offset voltage drift behavior of the op amp. nf 3 nf 7 V+ V kω OPA3 Trim Range: ±mv typ OPA3 single op amp only. Use offset adjust pins only to null offset voltage of op amp see text. FIGURE. OPA3 Offset Voltage Trim Circuit. INPUT BIAS CURRENT The input bias current is approximately pa at room temperature and increases with temperature as shown in the typical performance curve Input Bias Current vs Temperature. Input stage cascode circuitry assures that the input bias current remains virtually unchanged throughout the full input common-mode range of the OPA3. See the typical performance curve Input Bias Current vs Common-Mode Voltage. 7 OPA3, 3, 3
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