® INA INA154 154 For most current data sheet and other product information, visit www.burr-brown.com High-Speed, Precision DIFFERENCE AMPLIFIER (G = 1) FEATURES APPLICATIONS ● DESIGNED FOR LOW COST ● DIFFERENTIAL INPUT AMPLIFIER ● LOW OFFSET VOLTAGE: ±750µV max ● LOW OFFSET DRIFT: ±2µV°C ● INSTRUMENTATION AMPLIFIER BUILDING BLOCK ● UNITY-GAIN INVERTING AMPLIFIER ● LOW GAIN ERROR: ±0.05% max ● WIDE BANDWIDTH: 3MHz ● SUMMING AMPLIFIER ● DIFFERENTIAL CURRENT RECEIVER ● HIGH SLEW RATE: 14V/µs ● FAST SETTLING TIME: 3µs to 0.01% ● VOLTAGE-CONTROLLED CURRENT SOURCE ● SYNCHRONOUS DEMODULATOR ● WIDE SUPPLY RANGE: ±4V to ±18V ● LOW QUIESCENT CURRENT: 2.4mA ● SO-8 SURFACE-MOUNT PACKAGE DESCRIPTION V+ The INA154 is a high slew rate, unity-gain difference amplifier consisting of a precision op amp with a precision resistor network. The on-chip resistors are laser trimmed for accurate gain and high commonmode rejection. Excellent TCR tracking of the resistors maintains gain accuracy and common-mode rejection over temperature. The input common-mode voltage range extends beyond the positive and negative supply rails. It operates on ±4V to ±18V supplies. The difference amplifier is the foundation of many commonly used circuits. The INA154 provides this circuit function without using an expensive precision resistor network. The INA154 is available in a SO-8 surface-mount package and is specified for operation over the extended industrial temperature range, –40°C to +85°C. 7 –In 2 25kΩ 25kΩ 5 6 +In 3 25kΩ 25kΩ Sense Output 1 Ref 4 V– 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 ©1999 Burr-Brown Corporation SBOS104 PDS-1482B Printed in U.S.A. March, 1999 SPECIFICATIONS: VS = ±15V At TA = +25°C, VS = ±15V, RL = 2kΩ connected to ground, and reference pin connected to ground, unless otherwise noted. INA154U PARAMETER CONDITIONS VOLTAGE(1) OFFSET Initial vs Temperature vs Power Supply vs Time MIN OUTPUT VOLTAGE NOISE(3) f = 0.1Hz to 10Hz f = 1kHz GAIN Initial Error vs Temperature Nonlinearity VS = ±4V to ±18V VCM VO = 0V VO = 0V = –25V to 25V, RS = 0Ω ✽ ✽ 74 2(V+) – 5 2(V+) – 4 2(V–) + 5 2(V–) + 2 80 90 2.6 52 1 ±0.02 ±1 ±0.0001 VO = –13V to +13V TEMPERATURE RANGE Specified Operation Storage Thermal Resistance, ΘJA SO-8 Surface-Mount ±750 ±20 ±60 TYP MAX UNITS ✽ ✽ ✽ ✽ ±1500 ✽ ✽ µV µV/°C µV/V µV/mo ✽ ✽ kΩ kΩ ✽ ✽ ✽ V V dB ✽ ✽ µVp-p nV/√Hz RTO OUTPUT Voltage, Positive Negative Current Limit, Continuous to Common Capacitive Load (stable operation) POWER SUPPLY Rated Voltage Operating Voltage Range Quiescent Current ±100 ±2 ±5 0.5 MIN 50 50 VO = –13V to +13V FREQUENCY RESPONSE Small-Signal Bandwidth Slew Rate Settling Time: 0.1% 0.01% Overload Recovery Time MAX RTO INPUT IMPEDANCE(2) Differential Common-Mode INPUT VOLTAGE RANGE Common-Mode Voltage Range Positive Negative Common-Mode Rejection Ratio INA154UA TYP (V+) – 2 (V–) + 2 –3dB ✽ ✽ ✽ ✽ ±0.05 ±10 ±0.001 ✽ ✽ (V+) – 1.8 (V–) + 1.6 ±60 500 3.1 14 2 3 3 10V Step, CL = 100pF 10V Step, CL = 100pF 50% Overdrive ±15 ±4 ±2.4 IO = 0mA –40 –55 –55 150 ±0.1 ✽ ±0.002 ✽ ✽ ✽ ✽ V V mA pF ✽ ✽ ✽ ✽ ✽ MHz V/µs µs µs µs ✽ ±18 ±2.9 ✽ +85 +125 +125 ✽ ✽ ✽ V/V % ppm/°C % of FS ✽ ✽ ✽ ✽ V V mA ✽ ✽ ✽ °C °C °C °C/W ✽Specifications the same as INA154U. NOTES: (1) Includes effects of amplifier’s input bias and offset currents. (2) 25kΩ resistors are ratio matched but have ±20% absolute value. (3) Includes effects of amplifier’s input current noise and thermal noise contribution of resistor network. 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. ® INA154 2 ABSOLUTE MAXIMUM RATINGS(1) PIN CONFIGURATION TOP VIEW SO-8 Ref 1 8 Supply Voltage, V+ to V– .................................................................... 40V Input Voltage Range ......................................................................... ±80V Output Short Circuit (to ground) ............................................. Continuous Operating Temperature .................................................. –55°C to +125°C Storage Temperature ..................................................... –55°C to +125°C Junction Temperature .................................................................... +150°C Lead Temperature (soldering, 10s) ............................................... +300°C NIC –In 2 7 V+ +In 3 6 Output V– 4 5 Sense NOTE: (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. 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. NC = No Internal Connection 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) INA154U " INA154UA " SO-8 Surface-Mount " SO-8 Surface-Mount " 182 " 182 " SPECIFIED TEMPERATURE RANGE PACKAGE MARKING ORDERING NUMBER(2) TRANSPORT MEDIA –40°C to +85°C " –40°C to +85°C " INA154U " INA154UA " INA154U INA154U/2K5 INA154UA INA154UA/2K5 Rails Tape and Reel Rails Tape and Reel NOTES: (1) For detailed drawing and dimension table, please see end of data sheet, or Appendix C of Burr-Brown IC Data Book. (2) 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 “INA154U/2K5” will get a single 2500-piece Tape and Reel. For detailed Tape and Reel mechanical information, refer to Appendix B of Burr-Brown IC Data Book. ® 3 INA154 TYPICAL PERFORMANCE CURVES At TA = +25°C and VS = ±15V, unless otherwise noted. GAIN vs FREQUENCY COMMON-MODE REJECTION RATIO vs FREQUENCY 10 Common-Mode Rejection Ratio (dB) 100 Voltage Gain (dB) 0 –10 –20 80 60 40 20 0 –30 1k 10k 100k 1M 10M 1k 10k Frequency (Hz) POWER SUPPLY REJECTION RATIO vs FREQUENCY 40 80 Output Voltage (Vp-p) 100 –PSRR 60 40 30 20 10 +PSRR 20 0 0 100 1k 10k 100k 1M 100 1k 10k 100k Frequency (Hz) INPUT COMMON-MODE VOLTAGE RANGE vs OUTPUT VOLTAGE TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY 10M 1 VS = ±15V 30 VO = 10Vrms 20 0.1 THD+Noise (%) 10 0 –10 –20 0.010 RL = 100kΩ RL = 2kΩ 0.001 –30 –40 1M Frequency (Hz) 40 Common-Mode Voltage (V) 1M MAXIMUM OUTPUT VOLTAGE vs FREQUENCY 120 Power Supply Rejection Ratio (dB) 100k Frequency (Hz) VREF = 0V RL = 2kΩ RL = 600Ω –50 0.0001 –20 –15 –10 –5 0 5 10 15 20 20 Output Voltage (V) 1k Frequency (Hz) ® INA154 100 4 10k 20k TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, and VS = ±15V, unless otherwise noted. QUIESCENT CURRENT vs TEMPERATURE SLEW RATE vs TEMPERATURE 4 16 3 14 Slew Rate (V/µs) Quiescent Current (mA) –SR 2 1 0 +SR 12 10 8 –75 –50 –25 0 25 50 75 100 125 –75 –50 –25 Temperature (°C) SHORT-CIRCUIT CURRENT vs TEMPERATURE 50 75 100 125 OUTPUT VOLTAGE SWING vs OUTPUT CURRENT 13 40 Output Voltage Swing (V) 60 Short-Circuit Current (mA) 25 14 80 +ISC 20 0 –20 –ISC –40 –60 –55°C 12 25°C 11 125°C 10 85°C 9 –9 85°C 125°C –10 –11 –12 25°C –13 –55°C –14 –80 –75 –50 –25 0 25 50 75 100 125 0 ±20 ±40 ±60 Temperature (°C) Output Current (mA) OUTPUT VOLTAGE NOISE SPECTRAL DENSITY vs FREQUENCY OUTPUT NOISE VOLTAGE vs NOISE BANDWIDTH 10k ±80 ±100 10k 100k 100 Noise Voltage (µVrms) Voltage Noise (nV/√Hz) 0 Temperature (°C) 1k 100 10 10 1 0.1 1 10 100 1k 10k 100k 1M 1 Frequency (Hz) 10 100 1k Frequency (Hz) ® 5 INA154 TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C, and VS = ±15V, unless otherwise noted. OFFSET VOLTAGE PRODUCTION DISTRIBUTION Typical production distribution of packaged units. 20 15 10 15 10 5 0 0 –1000 –900 –800 –700 –600 –500 –400 –300 –200 –100 0 100 200 300 400 500 600 700 800 900 1000 5 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 Offset Voltage Drift (µV/°C) Offset Voltage (µV) SMALL-SIGNAL STEP RESPONSE LARGE-SIGNAL STEP RESPONSE CL = 500pF CL = 100pF 5V/div 50mV/div CL = 500pF 1µs/div 1µs/div SMALL-SIGNAL OVERSHOOT vs LOAD CAPACITANCE 70 60 50 Overshoot (%) Percent of Units (%) 20 25 Typical Production Distribution of Packaged Units. Percent of Units (%) 25 OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 40 30 20 RL = 2kΩ 100mV Step 10 0 0 400 800 1200 Load Capacitance (pF) ® INA154 6 1600 2000 APPLICATIONS INFORMATION Figure 1 shows the basic connections required for operation of the INA154. Decoupling capacitors are strongly recommended in applications with noisy or high impedance power supplies. The capacitors should be placed close to the device pins as shown in Figure 1. V+ V– 1µF 1µF 7 4 INA154 As shown in Figure 1, the output is referred to the reference terminal (pin 1). A voltage applied to this pin will be summed with output signal. The differential input signal is connected to pins 2 and 3. The source impedances connected to the pinouts must be nearly equal to assure good common-mode rejection. A 5Ω mismatch in source impedance will degrade the common-mode rejection of a typical device to approximately 80dB (a 10Ω mismatch degrades CMR to 74dB). If the source has a known impedance mismatch, an additional resistor in series with the opposite input can be used to preserve good common-mode rejection. V2 V3 R1 25kΩ 2 R2 25kΩ 5 R3 25kΩ 3 6 RL R4 25kΩ VOUT = V3 – V2 Ref Do not interchange pins 1 and 3 or pins 2 and 5, even though nominal resistor values are equal. The resistors are laser trimmed for precise resistor ratios to achieve accurate gain and highest CMR. Interchanging these pins would not provide specified performance. 1 FIGURE 1. Basic Power Supply and Signal Connections. OPERATING VOLTAGE The INA154 operates from ±4V to ±18V supplies with excellent performance. Most behavior remains unchanged throughout the full operating voltage range. Parameters which vary significantly with operating voltage are shown in the Typical Performance Curves. INA154 2 V2 INPUT VOLTAGE RANGE The INA154 can accurately measure differential signals that are beyond the positive or negative power supply rails. The linear common-mode range extends from 2•(V+) – 5V to 2•(V–) +5V. See the Typical Performance Curve, “Input Common-Mode Range vs Output Voltage.” R1 R2 5 6 10Ω V3 3 VO R3 R4 OFFSET VOLTAGE TRIM +15V The INA154 is laser trimmed for low offset voltage and drift. Most applications require no external offset adjustment. Figure 2 shows an optional circuit for trimming the output offset voltage. The output is referred to the output reference terminal (pin 1), which is normally grounded. A voltage applied to the Ref terminal will be summed with the output signal. This can be used to null offset voltage as shown in Figure 2. The source impedance of a signal applied to the Ref terminal should be less than 10Ω to maintain good common-mode rejection. VO = V 3 – V2 Offset Adjustment Range = ±1V 1 150kΩ 100kΩ 10Ω –15V FIGURE 2. Offset Adjustment. ® 7 INA154 INA154 5 2 –In 6 1 V1 V2 BUF634 inside feedback loop contributes no error. INA154 2 5 V0 = V1 + V2 6 3 +In 1 3 BUF634 VO (Low IQ mode) FIGURE 3. Precision Summing Amplifier. FIGURE 5. Boosting Output Current. V1 INA154 –In A1 2 5 R2 V+ V+ 3 INA154 6 R1 2 VO R2 5 1 3 7 V2 A2 6 +In VO = (1 + 2R2/R1) (V2 –V1) The INA154 can be combined with op amps to form a complete instrumentation amplifier with specialized performance characteristics. BurrBrown offers many complete high performance IAs. Products with related performances are shown at the right. FEATURE SIMILIAR COMPLETE BURR-BROWN IAs Low Noise Ultra Low Bias Current (fA) Low Offset Drift, Low Noise FET Input (pA) INA103 INA116 INA114, INA128 INA111, INA121 A1, A2 OPA227 OPA129 OPA277 OPA2134 Ground 4 FIGURE 6. Pseudoground Generator. FIGURE 4. Precision Instrumentation Amplifier. ® INA154 1 8 (V+)/2 Ground RL V+ 0V to 10V In 12.5kΩ 1kΩ 7 50kΩ INA154 2 OPA227 +15V V2 2 5 25kΩ 25kΩ 6 REF102 6 10V R1 50.1Ω 2N3904 Set R1 = R2 For 4-20mA applications, the REF102 sets the 4mA low-scale output for 0V input. V3 3 25kΩ 25kΩ 1 R2 50.1Ω 4 4 IO = 4 to 20mA IO = V 3 – V 2 RLOAD 1 1 + 40kΩ R2 FIGURE 7. Precision Voltage-to-Current Conversion. The difference amplifier is a highly versatile building block that is useful in a wide variety of applications. See the INA105 data sheet for additional applications ideas, including: • Precision Summing Instrumentation Amplifier • Precision Absolute Value Buffer • Precision Voltage-to-Current Converter with Differential Inputs • Differential Input Voltage-to-Current Converter for Low IOUT • Current Receiver with Compliance to Rails • Precision Unity-Gain Inverting Amplifier • ±10V Precision Voltage Reference • Isolating Current Source • Differential Output Difference Amplifier • ±5V Precision Voltage Reference • Precision Unity-Gain Buffer • Isolating Current Source with Buffering Amplifier for Greater Accuracy • Window Comparator with Window Span and Window Center Inputs • Precision Average Value Amplifier • Precision G = 2 Amplifier (see INA157) • Precision G = 1/2 Amplifier (see INA157) • Precision Bipolar Offsetting • Precision Voltage-Controlled Current Source with Buffered Differential Inputs and Gain • Digitally Controlled Gain of ±1 Amplifier • Precision Summing Amplifier with Gain • Instrumentation Amplifier Guard Drive Generator ® 9 INA154 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