® INA1 INA132 32 INA1 32 Low Power, Single-Supply DIFFERENCE AMPLIFIER FEATURES APPLICATIONS ● LOW QUIESCENT CURRENT: 160µA ● DIFFERENTIAL INPUT AMPLIFIER ● WIDE SUPPLY RANGE Single Supply: 2.7V to 36V Dual Supplies: ±1.35V to ±18V ● LOW GAIN ERROR: ±0.075% max ● LOW NONLINEARITY: 0.001% max ● INSTRUMENTATION AMPLIFIER BUILDING BLOCK ● HIGH CMR: 90dB ● HIGHLY VERSATILE CIRCUIT ● EASY TO USE ● SUMMING AMPLIFIER ● DIFFERENTIAL CURRENT RECEIVER ● VOLTAGE-CONTROLLED CURRENT SOURCE ● LOW COST ● 8-PIN DIP AND SO-8 PACKAGES ● BATTERY-POWERED SYSTEMS ● GROUND LOOP ELIMINATOR ● UNITY-GAIN INVERTING AMPLIFIER ● G = 1/2 AMPLIFIER ● G = 2 AMPLIFIER DESCRIPTION V+ The INA132 is a low power, unity-gain differential 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 internal op amp’s common-mode range extends to the negative supply— ideal for single-supply applications. It operates on single (2.7V to 36V) or dual supplies (±1.35V to ±18V). The differential amplifier is the foundation of many commonly used circuits. The INA132 provides this circuit function without using an expensive precision resistor network. The INA132 is available in 8-pin DIP and SO-8 surface-mount packages and is specified for operation over the extended industrial temperature range, –40°C to +85°C. 7 –In 2 40kΩ 40kΩ 5 6 +In 3 40kΩ 40kΩ 1 Sense Output 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/ • 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-1353A Printed in U.S.A. November, 1996 SPECIFICATIONS: VS = ±15V At TA = +25°C, VS = ±15V, RL = 10kΩ connected to Ground, and Reference Pin connected to Ground, unless otherwise noted. INA132P, U PARAMETER CONDITIONS OFFSET VOLTAGE(1) Initial vs Temperature vs Power Supply vs Time MIN OUTPUT VOLTAGE NOISE(3) f = 0.1Hz to 10Hz f = 1kHz MAX ±75 ±1 ±5 0.3 ±250 ±5 ±30 MIN TYP MAX UNITS ✽ ✽ ✽ ✽ ±500 ±10(4) ✽ µV µV/°C µV/V µV/mo RTO VS = ±1.35V to ±18V INPUT IMPEDANCE(2) Differential Common-Mode INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection INA132PA, UA TYP ✽ ✽ 80 80 VO = 0V VCM = –15V to 28V, RS = 0Ω (V–) 76 2(V+)–2 90 ✽ 70 kΩ kΩ ✽ ✽ V dB ✽ ✽ µVp-p nV/√Hz RTO 1.6 65 GAIN Initial Error vs Temperature(4) vs Nonlinearity OUTPUT Voltage, Positive Negative Positive Negative Current Limit, Continuous to Common Capacitive Load (Stable Operation) FREQUENCY RESPONSE Small Signal Bandwidth Slew Rate Settling Time: 0.1% 0.01% Overload Recovery Time POWER SUPPLY Rated Voltage Voltage Range Quiescent Current 1 ±0.01 ±1 ±0.0001 VO = –14V to 13.5V VO = –14V to 13.5V RL = 100kΩ to Ground RL = 100kΩ to Ground RL = 10kΩ to Ground RL = 10kΩ to Ground (V+)–1 (V–)+0.5 (V+)–1.5 (V–)+1 –3dB ✽ ✽ ✽ ✽ ±0.075 ±10 ±0.001 ✽ ✽ ✽ ✽ (V+)–0.8 (V–)+0.15 (V+)–0.8 (V–)+0.25 ±12 10,000 300 0.1 85 88 7 VO = 10V Step VO = 10V Step 50% Overdrive ±15 ±1.35 ±160 IO = 0mA TEMPERATURE RANGE Specification Operation Storage Thermal Resistance, ΘJA 8-Pin DIP SO-8 Surface-Mount –40 –55 –55 100 150 ±0.1 ✽ ±0.002 ✽ ✽ ✽ ✽ ✽ ✽ V V V V mA pF ✽ ✽ ✽ ✽ ✽ kHz V/µs µs µs µs ✽ ±18 ±185 ✽ +85 +125 +125 ✽ ✽ ✽ V/V % ppm/°C % of FS ✽ ✽ ✽ ✽ ✽ V V µA ✽ ✽ ✽ °C °C °C °C/W °C/W ✽Specifications the same as INA132P. NOTES: (1) Includes effects of amplifier’s input bias and offset currents. (2) 40kΩ 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. (4) Guaranteed by wafer test to 95% confidence level. 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. ® INA132 2 SPECIFICATIONS: VS = +5V At TA = +25°C, VS = +5V, RL = 10kΩ connected to VS/2, and Reference Pin connected to VS/2, unless otherwise noted. INA132P, U PARAMETER OFFSET VOLTAGE(1) Initial vs Temperature INPUT VOLTAGE RANGE Common-Mode Voltage Range Common-Mode Rejection CONDITIONS RTO MIN INA132PA, UA TYP MAX ±150 ±2 ±500 MIN TYP MAX UNITS ✽ ✽ ±750 µV µV/°C ✽ VCM = 0V to 8V, RS = 0Ω 0 76 90 ✽ 70 ✽ V dB RL = 100kΩ RL = 100kΩ RL = 10kΩ RL = 10kΩ (V+)–1 +0.25 (V+)–1 +0.25 (V+)–0.75 +0.06 (V+)–0.8 +0.12 ✽ ✽ ✽ ✽ ✽ ✽ ✽ ✽ V V V V OUTPUT Voltage, Positive Negative Positive Negative POWER SUPPLY Rated Voltage Voltage Range Quiescent Current 2(V+)–2 ✽ +5 +2.7 ±155 IO = 0mA +36 ±185 ✽ ✽ ✽ ✽ V V µA ✽Specifications the same as INA132P. NOTE: (1) Include effects of amplifier’s input bias and offset currents. PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGS TOP VIEW DIP/SOIC Ref 1 8 No Internal Connection –In 2 7 V+ +In 3 6 Output V– 4 5 Sense Supply Voltage, V+ to V– .................................................................... 36V 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 ORDERING INFORMATION PRODUCT PACKAGE PACKAGE DRAWING NUMBER(1) INA132PA INA132P INA132UA INA132U 8-Pin Plastic DIP 8-Pin Plastic DIP SO-8 Surface-Mount SO-8 Surface-Mount 006 006 182 182 TEMPERATURE RANGE –40°C to +85°C –40°C to +85°C –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. 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. ® 3 INA132 TYPICAL PERFORMANCE CURVES At TA = +25°C and VS = ±15V, unless otherwise noted. COMMON-MODE REJECTION vs FREQUENCY GAIN vs FREQUENCY 100 20 CL = 100pF RL = 10kΩ Common-Mode Rejection (dB) Closed-Loop Gain (dB) VS = ±15V or +5V 0 CL = 1000pF RL = ∞ –20 –40 90 VS = ±15V 80 VS = +5V 70 60 50 40 30 –60 10k 100k 10 1M 100 1k Frequency (Hz) V+ VS = +5V 60 –PSRR 40 125°C (V+) –0.5 VS = ±15V Output Voltage Swing (V) Power Supply Rejection (dB) +PSRR 80 1M 20 85°C 25°C (V+) –1 –55°C (V+) –1.5 (V+) –2 –40°C (V+) –2.5 (V–) +2.5 –55°C (V–) +2 –40°C 85°C (V–) +1.5 25°C (V–) +1 125°C (V–) +0.5 V– 0 10 100 1k 10k 100k 0 1M ±2 Frequency (Hz) 0.18 12 0.16 190 11 180 10 IQ 9 160 8 150 –75 –50 –25 0 25 50 75 100 Slew Rate (V/µs) ±ISC 170 ±8 ±10 0.14 0.12 0.10 0.08 7 125 0.06 –75 Temperature (°C) –50 –25 0 25 50 Temperature (°C) ® INA132 ±6 SLEW RATE vs TEMPERATURE 13 Short-Circuit Current |mA| 210 200 ±4 Output Current (mA) QUIESCENT and SHORT-CIRCUIT CURRENT vs TEMPERATURE Quiescent Current (µA) 100k OUTPUT VOLTAGE SWING vs OUTPUT CURRENT POWER SUPPLY REJECTION vs FREQUENCY 120 100 10k Frequency (Hz) 4 75 100 125 TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted. SMALL-SIGNAL STEP RESPONSE CL = 1000pF 50mV/div 50mV/div SMALL-SIGNAL STEP RESPONSE CL = 200pF 10µs/div 10µs/div SETTLING TIME vs LOAD CAPACITANCE LARGE-SIGNAL STEP RESPONSE 100 10V Step 5V/div Settling Time (µs) 96 0.01% 92 88 84 0.1% 80 100pF 100µs/div 1000pF 10,000pF Load Capacitance INPUT COMMON-MODE VOLTAGE RANGE vs OUTPUT VOLTAGE 0.1 to 10Hz PEAK-TO-PEAK VOLTAGE NOISE 40 VS = ±15V 20 VS = +5V 10 0.5µV/div Common-Mode Voltage (V) 30 0 –10 –20 VS = ±5V –30 VREF = 0V –40 –15 –10 –5 0 5 10 15 500ms/div Output Voltage (V) ® 5 INA132 TYPICAL PERFORMANCE CURVES (CONT) At TA = +25°C and VS = ±15V, unless otherwise noted. OFFSET VOLTAGE PRODUCTION DISTRIBUTION OFFSET VOLTAGE PRODUCTION DISTRIBUTION 18 25 16 Percent of Amplifiers (%) 20 15 10 5 0.1% 0.2% 0.1% VS = +5V 14 12 10 8 6 4 0.1% 2 0.1% OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION 40 VS = ±15V 35 Percent of Amplifiers (%) 30 25 20 15 10 0.2% 5 0.5 1 1.5 2 2.5 3 3.5 4 4.5 5 5.5 6 6.5 7 7.5 8 8.5 9 9.5 10 0 Offset Voltage Drift (µV/°C) ® 6 700 600 500 400 300 200 0 100 –100 –200 Offset Voltage (µV) Offset Voltage (µV) INA132 –300 –400 –500 –700 500 400 300 200 100 0 –100 –200 –300 –400 –600 0 0 –500 Percent of Amplifiers (%) VS = ±15V APPLICATIONS INFORMATION supply ground). Although input voltages on pins 2 and 3 that are below the negative supply voltage will not damage the device, operation in this region is not recommended. Transient conditions at the inverting input terminal below the negative supply can cause a positive feedback condition that could lock the INA132’s output to the negative rail. Figure 1 shows the basic connections required for operation of the INA132. Power supply bypass capacitors should be connected close to the device pins. The differential input signal is connected to pins 2 and 3 as shown. The source impedances connected to the inputs must be nearly equal to assure good common-mode rejection. An 8Ω mismatch in source impedance will degrade the common-mode rejection of a typical device to approximately 80dB. Gain accuracy will also be slightly affected. If the source has a known impedance mismatch, an additional resistor in series with one input can be used to preserve good common-mode rejection. The INA132 can accurately measure differential signals that are above the positive power supply. Linear common-mode range extends to nearly twice the positive power supply voltage—see typical performance curve, Common-Mode Range vs Output Voltage. OFFSET VOLTAGE TRIM The INA132 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. The source impedance of a signal applied to the Ref terminal should be less than 8Ω to maintain good common-mode rejection. To assure low impedance at the Ref terminal, the trim voltage can be buffered with an op amp, such as the OPA177. Do not interchange pins 1 and 3 or pins 2 and 5, even though nominal resistor values are equal. These resistors are laser trimmed for precise resistor ratios to achieve accurate gain and highest CMR. Interchanging these pins would not provide specified performance. As shown in Figure 1, measurements should be sensed at the load. V+ V– 1µF 1µF 7 4 CAPACITIVE LOAD DRIVE CAPABILITY INA132 V2 V3 2 3 R1 R2 40kΩ 40kΩ The INA132 can drive large capacitive loads, even at low supplies. It is stable with a 10,000pF load. Refer to the “Small-Signal Step Response” and “Settling Time vs Load Capacitance” typical performance curves. 5 6 R3 RL 40kΩ INA132 R4 40kΩ Ref 2 V2 VOUT = V3 – V2 R1 R2 5 1 6 8Ω FIGURE 1. Basic Power Supply and Signal Connections. V3 3 VO R3 R4 OPERATING VOLTAGE +15V The INA132 operates from single (+2.7V to +36V) or dual (±1.35V to ±18V) supplies with excellent performance. Specifications are production tested with +5V and ±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. VO = V3 – V2 Offset Adjustment Range = ±500µV Ref 1 R = 237kΩ 100kΩ 8Ω –15V NOTE: For ±750µV range, R = 158kΩ. The internal op amp in the INA132 is a single-supply design. This allows linear operation with the op amp’s commonmode voltage equal to, or slightly below V– (or single FIGURE 2. Offset Adjustment. ® 7 INA132 BUF634 inside feedback loop contributes no error. INA132 V1 INA132 –In 2 –In A1 5 5 2 R2 6 6 R1 A2 +In The INA132 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. OPA27 OPA129 OPA177 OPA2130 OPA2234 OPA2237 (Low IQ mode) RL FIGURE 4. Low Power, High Output Current Precision Difference Amplifier. VO = (1 + 2R2/R1) (V2 –V1) A1 , A2 VO 1 3 V2 1 3 +In VO R2 BUF634 V+ V+ 3 INA132 2 SIMILIAR COMPLETE BURR-BROWN IA FEATURE Low Noise Ultra Low Bias Current (fA) Low Offset Drift, Low Noise Low Power, FET-Input (pA) Single Supply, Precision, Low Power Single Supply, Low Power, MSOP-8 5 INA103 INA116 INA114,INA128 INA111 7 6 INA122(1), INA118 INA122(1), INA126(1) NOTE: (1) Available 1Q’97. Ground FIGURE 3. Precision Instrumentation Amplifier. 4 1 FIGURE 5. Pseudoground Generator. +5V 7 INA132 –In 2 5 6 +In ADS7806 12 Bits Out 0V-4V Input 1 3 4 VCM = 0V to 8V τS = 45µs (4V Step to 0.01%) FIGURE 6. Differential Input Data Acquisition. ® INA132 (V+)/2 8 Ground Set R1 = R2 V+ 0V to 10V In 12.5kΩ 1kΩ 7 50kΩ INA132 2 OPA27 +15V V2 2 5 40kΩ 40kΩ 6 REF10 6 10V For 4-20mA applications, the REF10 sets the 4mA low-scale output for 0V input. V3 3 40kΩ 40kΩ R1 50.1Ω 2N3904 1 R2 50.1Ω 4 4 IO = 4 to 20mA IO = V3 – V2 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 • ±5V Precision Voltage Reference • Isolating Current Source • Differential Output Difference Amplifier • Precision Unity-Gain Buffer • Precision Average Value Amplifier • Precision G = 2 Amplifier • Isolating Current Source with Buffering Amplifier for Greater Accuracy • Window Comparator with Window Span and Window Center Inputs • Precision Voltage-Controlled Current Source with Buffered Differential Inputs and Gain • Digitally Controlled Gain of ±1 Amplifier • Precision Summing Amplifier • Precision G = 1/2 Amplifier • Precision Bipolar Offsetting • Precision Summing Amplifier with Gain • Instrumentation Amplifier Guard Drive Generator ® 9 INA132