® OPA OPA OPA OPA 2234 234 OPA234 OPA2234 OPA4234 423 4 OPA 234 2234 OPA 423 OPA23 4 4 For most current data sheet and other product information, visit www.burr-brown.com Low Power, Precision SINGLE-SUPPLY OPERATIONAL AMPLIFIERS FEATURES OPA234 ● WIDE SUPPLY RANGE: Single Supply: VS = +2.7V to +36V Dual Supply: VS = ±1.35V to ±18V ● GUARANTEED PERFORMANCE: +2.7V, +5V, and ±15V ● LOW QUIESCENT CURRENT: 250µA/amp ● LOW INPUT BIAS CURRENT: 25nA max ● LOW OFFSET VOLTAGE: 100µV max ● HIGH CMRR, PSRR, and AOL ● SINGLE, DUAL, and QUAD VERSIONS Offset Trim 1 8 NC –In 2 7 V+ +In 3 6 Output V– 4 5 Offset Trim 8-Pin DIP, SO-8, MSOP-8 OPA2234 DESCRIPTION The OPA234 series low cost op amps are ideal for single supply, low voltage, low power applications. The series provides lower quiescent current than older “1013”-type products and comes in current industrystandard packages and pinouts. The combination of low offset voltage, high common-mode rejection, high power supply rejection, and a wide supply range provides excellent accuracy and versatility. Single, dual, and quad versions have identical specifications for maximum design flexibility. These general purpose op amps are ideal for portable and battery powered applications. OPA234 series op amps operate from either single or dual supplies. In single supply operation, the input common-mode range extends below ground and the output can swing to within 50mV of ground. Excellent phase margin makes the OPA234 series ideal for demanding applications, including high load capacitance. Dual and quad designs feature completely independent circuitry for lowest crosstalk and freedom from interaction. Single version packages are DIP-8, SO-8 surface-mount, and a space-saving MSOP-8 surface-mount. Dual packages are DIP-8 and SO-8 surface-mount. Quad packages are DIP-14 and SO-14 surface-mount. All are specified for –40°C to +85°C operation. Out A –In A 1 A 2 +In A 3 V– 4 B 8 V+ 7 Out B 6 –In B 5 +In B 8-Pin DIP, SO-8 OPA4234 Out A 1 –In A 2 A 14 Out D 13 –In D 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/ • Cable: BBRCORP • Telex: 066-6491 • FAX: (520) 889-1510 • Immediate Product Info: (800) 548-6132 ® © 1996 Burr-Brown Corporation SBOS055 1 PDS-1318B Printed in U.S.A., May, 2000 OPA234, 2234, 4234 SPECIFICATIONS: VS = +5V At TA = 25°C, VS = +5V, RL = 10kΩ connected to VS /2 and VOUT = VS /2, unless otherwise noted. OPA234PA, UA, EA OPA2234PA, UA OPA4234PA, UA, U OPA234P, U, E OPA2234P, U PARAMETER CONDITION OFFSET VOLTAGE Input Offset Voltage OPA234E, EA vs Temperature(1) vs Power Supply vs Time Channel Separation (Dual, Quad) dVOS/dT PSRR INPUT BIAS CURRENT Input Bias Current(2) Input Offset Current MAX Operating Temperature Range VS = +2.7V to +30V, VCM = 1.7V ±40 ±100 ±0.5 3 0.2 0.3 VCM = 2.5V VCM = 2.5V –15 ±1 VCM = 2.5V IB IOS NOISE Input Voltage Noise Density Current Noise Density INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection TYP VOS MIN MIN TYP MAX UNITS ±100 ±150 ±3 10 ✻ ✻ ✻ ✻ ✻ ✻ ±250 ±350 ✻ 20 µV µV µV/°C µV/V µV/mo µV/V –30 ±5 ✻ ✻ –50 ✻ nA nA f = 1kHz CMRR FREQUENCY RESPONSE Gain-Bandwidth Product Slew Rate Settling Time: 0.1% 0.01% Overload Recovery Time VO = 0.25V to 4V RL = 10kΩ RL = 2kΩ AOL TEMPERATURE RANGE Specified Range Operating Range Storage Thermal Resistance 8-Pin DIP SO-8 Surface-Mount MSOP-8 Surface-Mount 14-Pin DIP SO-14 Surface-Mount 108 86 CL = 100pF GBW SR (V+) –1 106 ✻ 86 107 || 5 1010 || 6 VCM = 2.5V RL = 10kΩ to VS /2 RL = 10kΩ to VS /2 RL = 10kΩ to Ground RL = 10kΩ to Ground 120 96 100 86 0.35 0.2 15 25 16 G = 1, 3V Step, CL = 100pF G = 1, 3V Step, CL = 100pF (VIN) (Gain) = VS OUTPUT Voltage Output: Positive Negative Positive Negative Short-Circuit Current ISC Capacitive Load Drive (Stable Operation)(3) POWER SUPPLY Specified Operating Voltage Operating Voltage Range Quiescent Current (per amplifier) –0.1 91 VCM = –0.1V to 4V INPUT IMPEDANCE Differential Common-Mode OPEN-LOOP GAIN Open-Loop Voltage Gain ✻ ✻ 25 80 vn in (V+) –1 0.25 (V+) –1 0.1 G = +1 ✻ ✻ ✻ ✻ (V+) –0.65 0.05 (V+) –0.65 0.05 ±11 1000 IQ IO = 0 250 –40 –40 –55 ✻ ✻ V dB ✻ ✻ Ω || pF Ω || pF ✻ ✻ dB dB ✻ ✻ ✻ ✻ ✻ MHz V/µs µs µs µs ✻ ✻ ✻ ✻ ✻ ✻ V V V V mA pF ✻ +5 +2.7 +36 300 ✻ +85 +125 +125 ✻ ✻ ✻ ✻ θJA 100 150 220 80 110 nV/√Hz fA/√Hz ✻ ✻ ✻ ✻ ✻ ✻ ✻ V V µA ✻ ✻ ✻ °C °C °C °C/W °C/W °C/W °C/W °C/W ✻ Specifications same as OPA234P,U,E. NOTES: (1) Guaranteed by wafer-level test to 95% confidence level. (2) Positive conventional current flows into the input terminals. (3) See “Small-Signal Overshoot vs Load Capacitance” typical curve. 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. ® OPA234, 2234, 4234 2 SPECIFICATIONS: VS = +2.7V At TA = 25°C, VS = +2.7V, RL = 10kΩ connected to VS /2 and VOUT = VS /2, unless otherwise noted. OPA234PA, UA, EA OPA2234PA, UA OPA4234PA, UA, U OPA234P, U, E OPA2234P, U PARAMETER OFFSET VOLTAGE Input Offset Voltage OPA234E, EA vs Temperature(1) vs Power Supply vs Time Channel Separation (Dual, Quad) CONDITION VOS dVOS/dT PSRR INPUT BIAS CURRENT Input Bias Current(2) Input Offset Current IB IOS NOISE Input Voltage Noise Density Current Noise Density INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection MIN TYP MAX Operating Temperature Range VS = +2.7V to +30V, VCM = 1.7V ±40 ±100 ±0.5 3 0.2 0.3 VCM = 1.35V VCM = 1.35V –15 ±1 VCM = 1.35V MIN TYP MAX UNITS ±100 ±150 ±3 10 ✻ ✻ ✻ ✻ ✻ ✻ ±250 ±350 ✻ 20 µV µV µV/°C µV/V µV/mo µV/V –30 ±5 ✻ ✻ –50 ✻ nA n f = 1kHz CMRR INPUT IMPEDANCE Differential Common-Mode OPEN-LOOP GAIN Open-Loop Voltage Gain FREQUENCY RESPONSE Gain-Bandwidth Product Slew Rate Settling Time: 0.1% 0.01% Overload Recovery Time GBW SR TEMPERATURE RANGE Specified Range Operating Range Storage Thermal Resistance 8-Pin DIP SO-8 Surface-Mount MSOP-8 Surface-Mount 14-Pin DIP SO-14 Surface-Mount (V+) –1 106 ✻ 86 107 || 5 1010 || 6 VO = 0.25V to 1.7V RL = 10kΩ RL = 2kΩ 108 86 CL = 100pF RL = 10kΩ to VS /2 RL = 10kΩ to VS /2 RL = 10kΩ to Ground RL = 10kΩ to Ground 125 96 100 86 0.35 0.2 6 16 8 G = 1, 1V Step, CL = 100pF G = 1, 1V Step, CL = 100pF (VIN) (Gain) = VS OUTPUT Voltage Output: Positive Negative Positive Negative Short-Circuit Current ISC Capacitive Load Drive (Stable Operation)(3) POWER SUPPLY Specified Operating Voltage Operating Voltage Range Quiescent Current (per amplifier) –0.1 91 VCM = –0.1V to 1.7V VCM = 1.35V AOL ✻ ✻ 25 80 vn in (V+) –1 0.25 (V+) –1 0.1 G = +1 ✻ ✻ ✻ ✻ (V+) –0.6 0.05 (V+) –0.65 0.05 ±8 1000 IQ IO = 0 250 –40 –40 –55 ✻ ✻ V dB ✻ ✻ Ω || pF Ω || pF ✻ ✻ dB dB ✻ ✻ ✻ ✻ ✻ MHz V/µs µs µs µs ✻ ✻ ✻ ✻ ✻ ✻ V V V V mA pF ✻ +2.7 +2.7 +36 300 ✻ +85 +125 +125 ✻ ✻ ✻ ✻ θJA 100 150 220 80 110 nV/√Hz fA/√Hz ✻ ✻ ✻ ✻ ✻ ✻ ✻ V V µA ✻ ✻ ✻ °C °C °C °C/W °C/W °C/W °C/W °C/W ✻ Specifications same as OPA234P,U,E. NOTES: (1) Guaranteed by wafer-level test to 95% confidence level. (2) Positive conventional current flows into the input terminals. (3) See “Small-Signal Overshoot vs Load Capacitance” typical curve. ® 3 OPA234, 2234, 4234 SPECIFICATIONS: VS = ±15V At TA = 25°C, VS = ±15V, RL = 10kΩ connected to ground, unless otherwise noted. OPA234PA, UA, EA OPA2234PA, UA OPA4234PA, UA, U OPA234P, U, E OPA2234P, U PARAMETER CONDITION OFFSET VOLTAGE Input Offset Voltage OPA4234U Model vs Temperature(1) vs Power Supply vs Time Channel Separation (Dual, Quad) dVOS/dT PSRR INPUT BIAS CURRENT Input Bias Current(2) Input Offset Current MAX VCM = 0V ±70 ±250 Operating Temperature Range VS = ±1.35V to ±18V, VCM = 0V ±0.5 3 0.2 0.3 VCM = 0V VCM = 0V –12 ±1 IB IOS NOISE Input Voltage Noise Density Current Noise Density INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection TYP VOS MIN MIN TYP MAX UNITS ±5 10 ✻ ±70 ✻ ✻ ✻ ✻ ±500 ±250 ✻ 20 µV µV µV/°C µV/V µV/mo µV/V –25 ±5 ✻ ✻ –50 ✻ nA nA f = 1kHz vn in CMRR FREQUENCY RESPONSE Gain-Bandwidth Product Slew Rate Settling Time: 0.1% 0.01% Overload Recovery Time VO = –14.5V to 14V AOL GBW SR TEMPERATURE RANGE Specified Range Operating Range Storage Thermal Resistance 8-Pin DIP SO-8 Surface-Mount MSOP-8 Surface-Mount 14-Pin DIP SO-14 Surface-Mount 110 CL = 100pF ✻ 86 120 100 0.35 0.2 41 47 22 G = 1, 10V Step, CL = 100pF G = 1, 10V Step, CL = 100pF (VIN) (Gain) = VS ✻ ✻ (V+) –1 (V+) –0.7 (V–) +0.5 (V–) +0.15 ±22 1000 G = +1 ±1.35 IQ (V+) –1 106 107 || 5 1010 || 6 VCM = 0V OUTPUT Voltage Output: Positive Negative Short-Circuit Current ISC Capacitive Load Drive (Stable Operation)(3) POWER SUPPLY Specified Operating Voltage Operating Voltage Range Quiescent Current (per amplifier) (V–) 91 VCM = –15V to 14V INPUT IMPEDANCE Differential Common-Mode OPEN-LOOP GAIN Open-Loop Voltage Gain ✻ ✻ 25 80 IO = 0 ±15 ±275 –40 –40 –55 ✻ ✻ V dB ✻ ✻ Ω || pF Ω || pF ✻ dB ✻ ✻ ✻ ✻ ✻ MHz V/µs µs µs µs ✻ ✻ ✻ ✻ V V mA pF ✻ ±18 ±350 ✻ +85 +125 +125 ✻ ✻ ✻ ✻ θJA 100 150 220 80 110 nV/√Hz fA/√Hz ✻ ✻ ✻ ✻ ✻ ✻ ✻ V V µA ✻ ✻ ✻ °C °C °C °C/W °C/W °C/W °C/W °C/W ✻ Specifications same as OPA234P,U,E. NOTES: (1) Guaranteed by wafer-level test to 95% confidence level. (2) Positive conventional current flows into the input terminals. (3) See “Small-Signal Overshoot vs Load Capacitance” typical curve. ® OPA234, 2234, 4234 4 ELECTROSTATIC DISCHARGE SENSITIVITY ABSOLUTE MAXIMUM RATINGS Supply Voltage, V+ to V– .................................................................... 36V Input Voltage ..................................................... (V–) –0.7V to (V+) +0.7V Output Short-Circuit(1) .............................................................. 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. NOTE: (1) 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 Single OPA234EA MSOP-8 Surface-Mount 337 –40°C to +85°C A34(2) " " " " MSOP-8 Surface-Mount 337 –40°C to +85°C A34(2) " " " " Plastic DIP-8 006 –40°C to +85°C OPA234PA OPA234P OPA234UA OPA234U OPA234EA/250 OPA234EA/2K5 OPA234E/250 OPA234E/2K5 OPA234PA OPA234P OPA234UA OPA234U OPA2234PA OPA2234P OPA2234UA OPA2234U OPA2234PA OPA2234P OPA2234UA OPA2234U Rails Rails Rails Rails OPA4234PA OPA4234P OPA4234UA OPA4234U OPA4234PA OPA4234P OPA4234UA OPA4234U Rails Rails Rails Rails " OPA234E " OPA234PA OPA234P OPA234UA OPA234U Dual OPA2234PA OPA2234P OPA2234UA OPA2234U Quad OPA4234PA OPA4234P OPA4234UA OPA4234U SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER(1) TRANSPORT MEDIA Tape and Reel Tape and Reel Tape and Reel Tape and Reel Rails Rails Rails Rails " " " SO-8 Surface-Mount 182 –40°C to +85°C " " " Plastic DIP-8 006 –40°C to +85°C " " " SO-8 Surface-Mount 182 –40°C to +85°C " " " Plastic DIP-8 006 –40°C to +85°C " " " SO-8 Surface-Mount 182 –40°C to +85°C " " " NOTE: (1) Models with a slash (/) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500 pieces of “OPA234E//2K5” will get a single 2500-piece Tape and Reel. (2) The grade will be marked on the Reel. ® 5 OPA234, 2234, 4234 TYPICAL PERFORMANCE CURVES At TA = +25°C and RL = 10kΩ unless otherwise noted. POWER SUPPLY AND COMMON-MODE REJECTION vs FREQUENCY OPEN-LOOP GAIN/PHASE vs FREQUENCY 140 VS = +2.7V 120 –60 φ 60 –90 40 –120 VO = 0.25V 20 –150 G V VO = S 2 0 PSR, CMR (dB) –30 80 1 10 100 1k 10k 100k 80 70 60 CMR 50 40 30 VS = +2.7V, +5V or ±15V VS = +2.7V or +5V VS = ±15V 20 10 0 –180 –20 0.1 +PSR 100 90 Phase (°) Voltage Gain (dB) CL = 100pF VS = +5V ±15V 100 120 110 0 1M 10 100 –PSR 1k Frequency (Hz) 10k 100k 1M Frequency (Hz) INPUT NOISE AND CURRENT NOISE SPECTRAL DENSITY vs FREQUENCY CHANNEL SEPARATION vs FREQUENCY 1k 160 Channel Separation (dB) Voltage Noise (nV/√Hz) Current Noise (fA/√Hz) RL = 10kΩ Current Noise 100 140 120 Dual and quad devices. G = 1, all channels. Quad measured channel A to D or B to C—other combinations yield improved rejection. 100 Voltage Noise 80 10 1 10 100 1k 10k 100k 10 100 Frequency (Hz) 100k –17 –20 VS = +2.7V, +5V VS = +5V –16 Input Bias Current (nA) Input Bias, Input Offset Current (nA) 10k INPUT BIAS CURRENT vs INPUT COMMON-MODE VOLTAGE INPUT BIAS AND INPUT OFFSET CURRENT vs TEMPERATURE –15 1k Frequency (Hz) IB VS = ±15V –10 –5 IOS 0 –15 VS = +2.7V –14 –13 VS = ±15V –12 –11 –10 +5 –75 –50 –25 0 25 50 75 100 –15 125 Ambient Temperature (°C) ® OPA234, 2234, 4234 6 –10 –5 0 5 Common-Mode Voltage (V) 10 15 TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C and RL = 10kΩ unless otherwise noted. OFFSET VOLTAGE PRODUCTION DISTRIBUTION OFFSET VOLTAGE PRODUCTION DISTRIBUTION 30 25 15 10 5 0.1% 0.3% 0.1% Typical production distribution of packaged units. Single, dual, and quad units included. VS = ±15V 20 15 10 0.7% 0.3% 5 0.5% 0.1% 0.2% 500 400 300 200 100 0 –100 –200 –500 200 175 150 125 75 100 50 0 25 25 75 50 100 125 150 175 200 –300 0 0 –400 20 VS = +2.7V, +5V Typical production distribution of packaged units. Single, dual, and quad units included. Percent of Amplifiers (%) Percent of Amplifiers (%) 25 Offset Voltage (µV) Offset Voltage (µV) OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 35 35 25 30 Percent of Amplifiers (%) 20 15 10 0.3% 5 0.2% 0.1% 0.1% 25 20 15 10 0.3% 0.5% 0.2% 0.1% 5 0.1% OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION Typical production distribution of packaged units. Single, dual, and quad units included. 15 10 5 0.2% 0.1% 0.1% 0.1% 0.1% 120 5 4.5 4 3.5 PSR 110 CMR 100 90 80 70 0 VS = +2.7V VS = +5V VS = ±15V AOL 130 20 0.4% 0.3% 3 140 AOL, CMR, PSR (dB) 25 2.5 AOL, CMR, PSR vs TEMPERATURE 30 VS = ±15V 2 1.5 0.5 5 4 3.5 3 2.5 2 1.5 1 0.5 4.5 Offset Voltage Drift (µV/°C) Offset Voltage Drift (µV/°C) VCM = (V–) –0.02V to (V+) –1V 8 7.5 7 6.5 6 5 5.5 4.5 4 3.5 3 2.5 2 1.5 1 60 0.5 Percent of Amplifiers (%) 0.1% 0 0 1 Percent of Amplifiers (%) 30 Typical production distribution of packaged units. Single, dual, and quad units included. VS = +5V Typical production distribution of packaged units. Single, dual, and quad units included. VS = +2.7V –75 –50 –25 0 25 50 75 100 125 Ambient Temperature (°C) Offset Voltage Drift (µV/°C) ® 7 OPA234, 2234, 4234 TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C and RL = 10kΩ unless otherwise noted. SMALL-SIGNAL STEP RESPONSE G = 1, CL = 10,000pF, VS = +5V 20mV/div 20mV/div SMALL-SIGNAL STEP RESPONSE G = 1, CL = 100pF, VS = +5V 20µs/div 2µs/div LARGE-SIGNAL STEP RESPONSE G = 1, CL = 100pF, VS = +5V SETTLING TIME vs CLOSED-LOOP GAIN 1000 1V/div Settling Time (µs) CL = 100pF VS = ±15V, 10V Step 100 10 VS = +5V, 3V Step VS = +2.7V, 1V Step 0.1% 0.01% 1 10µs/div ±1 ±10 ±100 Gain (V/V) SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE V+ (V+) –0.5 (V+) –1 (V+) –1.5 (V+) –2 (V+) –2.5 (V+) –3 70 25°C 60 85°C (V–) +3 (V–) +2.5 (V–) +2 (V–) +1.5 (V–) +1 (V–) +0.5 V– –40°C 85°C –40°C –55°C 25°C 125°C 0 VO = 100mVp-p –55°C 125°C Overshoot (%) Output Voltage Swing (V) OUTPUT VOLTAGE SWING vs OUTPUT CURRENT ±5 ±10 G = –1, G = +2 30 10 G = +1, VS = ±15V G = ±10 G = +1, VS = +2.7, +5V 0 10pF ±15 Output Current (mA) 100pF 1nF Load Capacitance ® OPA234, 2234, 4234 40 20 High output current may not be available at low supply voltages due to output swing limitations. G = –2 50 8 10nF 100nF TYPICAL PERFORMANCE CURVES (Cont.) At TA = +25°C and RL = 10kΩ unless otherwise noted. QUIESCENT CURRENT AND SHORT-CIRCUIT CURRENT vs TEMPERATURE VS = +2.7V VS = +5V VS = +2.7V or +5V VS = ±15V 450 VS = ±15V Maximum output voltage without slew-rate induced distortion 20 15 10 Quiescent Current (µA) 25 Output Voltage (Vp-p) 70 525 30 VS = +5V 5 375 60 50 ±IQ 300 40 30 225 150 20 ±ISC Short-Circuit Current (mA) MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 10 75 VS = ±2.7V 0 0 0 1k 10k 100k –75 –50 –25 0 25 50 75 100 125 Temperature (°C) Frequency (Hz) APPLICATIONS INFORMATION V+ OPA234 series op amps are unity-gain stable and suitable for a wide range of general-purpose applications. Power supply pins should be bypassed with 10nF ceramic capacitors. 10nF OPA234 single op amp only. Use offset adjust pins only to null offset voltage of op amp—see text. 7 2 6 3 OPERATING VOLTAGE OPA234 series op amps operate from single (+2.7V to +36V) or dual (±1.35V to ±18V) supplies with excellent performance. Specifications are production tested with +2.7V, +5V, and ±15V supplies. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary significantly with operating voltage are shown in typical performance curves. OPA234 5 1 10nF 4 100kΩ Trim Range: ±4mV typ (V–) = 0V for single supply operation. V– FIGURE 1. OPA234 Offset Voltage Trim Circuit. OFFSET VOLTAGE TRIM Offset voltage of OPA234 series amplifiers is laser trimmed and usually requires no user adjustment. The OPA234 (single op amp version) provides offset voltage trim connections on pins 1 and 5. 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 degrade the offset drift behavior of the op amp. While it is not possible to predict the exact change in drift, the effect is usually small. ® 9 OPA234, 2234, 4234 IMPORTANT NOTICE Texas Instruments and its subsidiaries (TI) reserve the right to make changes to their products or to discontinue any product or service without notice, and advise customers to obtain the latest version of relevant information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale supplied at the time of order acknowledgment, including those pertaining to warranty, patent infringement, and limitation of liability. TI warrants performance of its semiconductor products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are utilized to the extent TI deems necessary to support this warranty. Specific testing of all parameters of each device is not necessarily performed, except those mandated by government requirements. Customers are responsible for their applications using TI components. In order to minimize risks associated with the customer’s applications, adequate design and operating safeguards must be provided by the customer to minimize inherent or procedural hazards. TI assumes no liability for applications assistance or customer product design. TI does not warrant or represent that any license, either express or implied, is granted under any patent right, copyright, mask work right, or other intellectual property right of TI covering or relating to any combination, machine, or process in which such semiconductor products or services might be or are used. TI’s publication of information regarding any third party’s products or services does not constitute TI’s approval, warranty or endorsement thereof. Copyright 2000, Texas Instruments Incorporated