INA159 SBOS333B − JULY 2005 − REVISED OCTOBER 2005 Precision, Gain of 0.2 Level Translation DIFFERENCE AMPLIFIER FEATURES DESCRIPTION D GAIN OF 0.2 TO INTERFACE ±10V SIGNALS TO SINGLE-SUPPLY ADCs D D D D D D GAIN ACCURACY: ±0.024% (max) WIDE BANDWIDTH: 1.5MHz HIGH SLEW RATE: 15V/µs LOW OFFSET VOLTAGE: ±100µV LOW OFFSET DRIFT: ±1.5µV/°C SINGLE-SUPPLY OPERATION DOWN TO 1.8V APPLICATIONS D INDUSTRIAL PROCESS CONTROLS D INSTRUMENTATION D DIFFERENTIAL TO SINGLE-ENDED D The INA159 is a high slew rate, G = 1/5 difference amplifier consisting of a precision op amp with a precision resistor network. The gain of 1/5 makes the INA159 useful to couple ±10V signals to single-supply analog-to-digital converters (ADCs), particularly those operating on a single +5V supply. The on-chip resistors are laser-trimmed for accurate gain and high common-mode rejection. Excellent temperature coefficient of resistance (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 a total of +1.8V to +5.5V single or split supplies. The INA159 reference input uses two resistors for easy mid-supply or reference biasing. The difference amplifier is the foundation of many commonly-used circuits. The INA159 provides this circuit function without using an expensive external precision resistor network. The INA159 is available in an MSOP-8 surface-mount package and is specified for operation over the extended industrial temperature range, −40°C to +125°C. CONVERSION AUDIO LINE RECEIVERS VREF 5V V+ −IN 100kΩ 20kΩ SENSE REF R1 100Ω DOUT +IN C1 1000pF VIN +IN 100kΩ 40kΩ REF 2 40kΩ V+ −IN ADS8325 ADC DCLOCK CS GND REF 1 INA159 Figure 1. Typical Application Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet. All trademarks are the property of their respective owners. Copyright 2005, Texas Instruments Incorporated ! ! www.ti.com "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ABSOLUTE MAXIMUM RATINGS(1) Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +5.5V Signal Input Terminals (−IN and +IN), Voltage . . . . . . . . . . . . . ±30V Reference (REF 1 and REF2) and Sense Pins Current . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±10mA Voltage . . . . . . . . . . . . . . . . . . . . . . . . (V−) − 0.5V to (V+) + 0.5V Output Short Circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Operating Temperature . . . . . . . . . . . . . . . . . . . . . −40°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C ESD Rating Human Body Model . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4000V Charged Device Model . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000V (1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not supported. 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. ORDERING INFORMATION(1) PRODUCT PACKAGE-LEAD PACKAGE DESIGNATOR PACKAGE MARKING INA159 MSOP-8 DGK CJB (1) For the most current package and ordering information, see the Package Option Addendum at the end of this document, or see the TI web site at www.ti.com. PIN CONFIGURATIONS TOP VIEW MSOP INA159 2 REF 1 1 8 REF 2 −IN 2 7 V+ +IN 3 6 OUT V− 4 5 SENSE "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 ELECTRICAL CHARACTERISTICS: VS = +5V Boldface limits apply over the specified temperature range, TA = −40°C to +125°C. At TA = +25°C, RL = 10kΩ connected to VS/2, REF pin 1 connected to ground, and REF pin 2 connected to VREF = 5V, unless otherwise noted. INA159 PARAMETER CONDITIONS OFFSET VOLTAGE(1) Initial (1) VOS vs Temperature vs Power Supply PSRR Reference Divider Accuracy(2) over Temperature RTO VS = ±2.5V, Reference and Input Pins Grounded MIN VS = ±0.9V to ±2.75V INPUT IMPEDANCE(3) Differential Common-Mode INPUT VOLTAGE RANGE Common-Mode Voltage Range Positive Negative Common-Mode Rejection Ratio over Temperature CMRR ±100 ±1.5 ±20 ±0.002 ±0.002 ±500 µV µV/°C µV/V % % ±100 ±0.024 240 60 kΩ kΩ 17.5 −12.5 V V VCM = −10V to +10V, RS = 0Ω 80 96 dB 94 dB 10 30 µVPP nV/√Hz RTO VREF2 = 4.096V, RL Connected to GND, (VIN+) − (VIN−) = −10V to +10V, VCM = 0V G OUTPUT Voltage, Positive Voltage, Negative Current Limit, Continuous to Common Capacitive Load Open-Loop Output Impedance RO 0.2 ±0.005 ±1 ±0.0002 VREF2 = 4.096V, RL Connected to GND VREF2 = 4.096V, RL Connected to GND f = 1MHz, IO = 0 VS Quiescent Current IQ ±0.024 (V+) − 0.1 (V−) + 0.048 (V+) − 0.02 (V−) + 0.01 ±60 See Typical Characteristic 110 −3dB SR tS POWER SUPPLY Specified Voltage Range Operating Voltage Range TEMPERATURE RANGE Specified Range Operating Range Storage Range Thermal Resistance MSOP-8 UNIT VCM GAIN FREQUENCY RESPONSE Small-Signal Bandwidth Slew Rate Settling Time, 0.01% Overload Recovery Time MAX RTI OUTPUT VOLTAGE NOISE(4) f = 0.1Hz to 10Hz f = 10kHz Initial Error vs Temperature Nonlinearity TYP V V mA pF Ω 1.5 15 1 250 4V Output Step, CL = 100pF 50% Overdrive MHz V/µs µs ns +5 +1.8 IO = 0mA, VS = ±2.5V, Reference and Input Pins Grounded 1.1 −40 −40 −65 qJA Surface-Mount 150 V/V % ppm/°C % of FS +5.5 V V 1.5 mA +125 +150 +150 °C °C °C °C/W (1) Includes effects of amplifier input bias and offset currents. (2) Reference divider accuracy specifies the match between the reference divider resistors using the configuration in Figure 2. (3) Internal resistors are ratio matched but have ±20% absolute value. (4) Includes effects of amplifier input current noise and thermal noise contribution of resistor network. 3 "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 +5V V+ 2 7 100kΩ 20kΩ 5 6 3 100kΩ 40kΩ 40kΩ INA159 V− The test is performed by measuring the output with the reference applied to alternate reference resistors, and calculating a result such that the amplifier offset is cancelled in the final measurement. OUT 1 8 4 Figure 2. Test Circuit for Reference Divider Accuracy TYPICAL CHARACTERISTICS At TA = +25°C, RL = 10kΩ connected to VS/2, REF pin 1 connected to ground, and REF pin 2 connected to VREF = 5V, unless otherwise noted. OFFSET VOLTAGE DRIFT PRODUCTION DISTRIBUTION −500 −450 −400 −350 −300 −250 −200 −150 −100 −50 0 50 100 150 200 250 300 350 400 450 500 −10 −9 −8 −7 −6 −5 −4 −3 −2 −1 0 1 2 3 4 5 6 7 8 9 10 Population Population OFFSET VOLTAGE PRODUCTION DISTRIBUTION Offset Voltage Drift (µV/_C) Offset Voltage (µV) GAIN vs FREQUENCY POWER−SUPPLY REJECTION RATIO vs FREQUENCY 0 PSRR (dB) Gain (dB) −10 −20 −30 −40 −50 10 100 1k 10k Frequency (Hz) 4 100k 1M 10M 130 120 110 100 90 80 70 60 50 40 30 20 10 0 −10 10 100 1k 10k Frequency (Hz) 100k 1M 10M "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, RL = 10kΩ connected to VS/2, REF pin 1 connected to ground, and REF pin 2 connected to VREF = 5V, unless otherwise noted. COMMON−MODE REJECTION RATIO vs FREQUENCY QUIESCENT CURRENT vs TEMPERATURE 120 1.20 110 1.15 VS = 5.5V 100 1.10 CMRR (dB) 90 IQ (mA) 80 70 60 VS = 5V 1.05 1.00 0.95 VS = 1.8V 50 0.90 40 0.85 30 0.80 20 10 100 1k 10k 100k 1M −50 10M −25 0 Frequency (Hz) SHORT−CIRCUIT CURRENT vs TEMPERATURE 120 75 100 125 OUTPUT VOLTAGE SWING vs OUTPUT CURRENT 2.5 2.0 80 60 VS = ±2.5V Output Swing (V) I SC (mA) 50 3.0 VS = ±2.75V 100 25 Temperature (_C) 40 20 VS = ±0.9V 0 −20 VS = ±2.5V −40 −100 −50 VS = ±2.75V −25 0 25 50 TA = −40_C 1.0 0.5 TA = −40_C TA = +25_C TA = +125_ C 0 −0.5 TA = +125_C −1.0 −1.5 −60 −80 1.5 −2.0 VS = ±0.9V −2.5 VS = ±2.5V −3.0 75 100 0 125 10 20 30 40 50 60 70 80 Temperature (_C) Output Current (mA) TOTAL HARMONIC DISTORTION + NOISE vs FREQUENCY OUTPUT VOLTAGE NOISE SPECTRAL DENSITY vs FREQUENCY 90 1000 Output Voltage Noise (nV/√Hz) THD+Noise (%) 0.01 0.25VPP 2kΩ 4VPP 100 600Ω 10 0.001 10 100 1k Frequency (Hz) 10k 100k 1 10 100 1k 10k 100k Frequency (Hz) 5 "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 TYPICAL CHARACTERISTICS (continued) At TA = +25°C, RL = 10kΩ connected to VS/2, REF pin 1 connected to ground, and REF pin 2 connected to VREF = 5V, unless otherwise noted. 0.1Hz TO 10Hz NOISE SMALL−SIGNAL OVERSHOOT vs LOAD CAPACITANCE 60 5µV/div Overshoot (%) 50 40 30 VS = 5V 20 10 0 100 Time (1s/div) 1000 Load Capacitance (pF) LARGE−SIGNAL STEP RESPONSE 1V/div 200mV/div SMALL−SIGNAL STEP RESPONSE Time (500ns/div) Time (500ns/div) SETTLING TIME 2mV/div VOUT = 4V Step CL = 100pF Time (250ns/div) 6 3000 "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 APPLICATION INFORMATION The internal op amp of the INA159 has a rail-to-rail common-mode voltage capability at its inputs. A rail-to-rail op amp allows the use of ±10V inputs into a circuit biased to 1/2 of a 5V reference (2.5V quiescent output). The inputs to the op amp will swing from approximately 400mV to 3.75V in this application. The unique input topology of the INA159 eliminates the input offset transition region typical of most rail-to-rail complementary stage operational amplifiers. This allows the INA159 to provide superior glitch- and transition-free performance over the entire common-mode range. Good layout practice includes the use of a 0.1µF bypass capacitor placed closely across the supply pins. Where one REF pin is connected to the reference, and the other pin grounded (1/2 reference connection): V CM) + (V)) ) 5[(V)) * (0.5VREF)] (3) V CM* + (V*) * 5[(0.5V REF) * (V*)] (4) Some typical values are shown in Table 1. Table 1. Common-Mode Range For Various Supply and Reference Voltages REF 1 and REF 2 Connected Together V+ V− VREF VCM+ 5 0 3 15 VCM− −15 5 0 2.5 17.5 −12.5 5 0 1.25 23.75 −6.25 VREF VCM+ VCM− 1/2 Reference Connection COMMON-MODE RANGE The common-mode range of the INA159 is a function of supply voltage and reference. Where both pins, REF1 and REF2, are connected together: V CM) + (V)) ) 5[(V)) * VREF] V CM* + (V*) * 5[V REF * (V*)] (1) (2) V+ V− 5 0 5 17.5 −12.5 5 0 4.096 19.76 −10.24 5 0 2.5 23.75 −6.25 3.3 0 3.3 11.55 −8.25 3.3 0 2.5 13.55 −6.25 3.3 0 1.25 16.675 −3.125 7 "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 Table 2. Input and Output Relationships for Various Reference and Connection Combinations VREF (V) REF CONNECTION 5V 5 VOUT for VIN = 0 (V) LINEAR VIN RANGE (V) USEFUL VOUT SWING (V) 2.5 +10 0 −10 4.5 (±2V swing) 0.5 2.048 +10 0 −10 4.048 (±2V swing) 0.048 1.65 +10 0 −7.885 3.65 (−1.577V, +2V swing) 0.048 1.25 +10 (also +5) 0 −6 (also −5) 3.25 (−1.2V, +2V swing) 0.048 0.9 +10 0 −4.26 2.9 (−0.852V, +2V swing) 0.048 2.5 +10 0 −10 4.5 (±2V swing) 0.5 1.8 +10 0 −8.76 3.8 (−1.752V, +2V swing) 0.048 1.2 +10 0 −5.76 3.2 (−1.15V, +2V swing) 0.048 V+ −IN 100k 100kΩ 20k 20kΩ SENSE 4.096 OUT 3.3 VIN +IN 100kΩ 40kΩ REF 2 VREF 2.5 40kΩ REF 1 INA159 1.8 5V V+ 2.5 −IN 100kΩ 20kΩ SENSE OUT 1.8 VIN +IN 100kΩ 40kΩ 40kΩ REF 2 V REF REF 1 INA159 1.2 8 "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 VREF 5V V+ −IN 100kΩ 20kΩ SENSE REF R1 100Ω DOUT +IN C1 1000pF VIN +IN 100kΩ 40kΩ 40kΩ V+ −IN ADS8325 ADC DCLOCK CS REF 2 GND REF 1 INA159 Figure 3. Typical Application Circuit Interfacing to Medium-Speed, Single-Supply ADCs VREF 5V V+ −IN 100kΩ 20kΩ SENSE REF R1 100Ω DOUT +IN 100kΩ 40kΩ 40kΩ REF 2 ADS8361 or ADS7861 ADC −IN +IN C1 1000pF VIN V+ DCLOCK CS GND REF 1 INA159 Figure 4. Typical Application Circuit Interfacing to Medium-Speed, Single-Supply ADCs with Pseudo-Differential Inputs (such as the ADS7861 and ADS8361) 9 "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 VREF 5V V+ −IN 100kΩ 20kΩ SENSE REF R1 100Ω VIN +IN 100kΩ 40kΩ 40kΩ +IN C1 1000pF V+ ADC −IN REF 2 GND REF 1 INA159 a) Unipolar, Noninverting, G = 0.2 VREF 5V V+ −IN 100kΩ 20kΩ SENSE REF R1 100Ω VIN +IN 100kΩ 40kΩ 40kΩ +IN C1 1000pF V+ ADC −IN REF 2 GND REF 1 INA159 b) Bipolar, Noninverting, G = 0.2 VREF 5V V+ −IN 100kΩ 20kΩ SENSE REF R1 100Ω +IN 100kΩ 40kΩ 40kΩ +IN C1 1000pF REF 2 REF 1 INA159 VIN c) Unipolar, Unity Gain Figure 5. Basic INA159 Configurations 10 V+ ADC −IN GND "#$ www.ti.com SBOS333B − JULY 2005 − REVISED OCTOBER 2005 5V V+ VIN− −IN A 100kΩ 20kΩ SENSE A OUT A 100Ω 1000pF VIN+ +IN A 100kΩ 40kΩ 40kΩ REF 2A REF 1A INA159 VREF V+ −IN B 100kΩ 20kΩ REF SENSE B OUT B V+ +IN 100Ω −IN 5V ADC 1000pF GND +IN B 100kΩ 40kΩ 40kΩ REF 2B REF 1B INA159 Figure 6. Differential ADC Drive 11 PACKAGE OPTION ADDENDUM www.ti.com 4-Nov-2005 PACKAGING INFORMATION Orderable Device Status (1) Package Type Package Drawing Pins Package Eco Plan (2) Qty INA159AIDGKR ACTIVE MSOP DGK 8 2500 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM INA159AIDGKT ACTIVE MSOP DGK 8 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM INA159AIDGKTG4 ACTIVE MSOP DGK 8 250 Green (RoHS & no Sb/Br) CU NIPDAU Level-1-260C-UNLIM Lead/Ball Finish MSL Peak Temp (3) (1) The marketing status values are defined as follows: ACTIVE: Product device recommended for new designs. LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect. NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design. PREVIEW: Device has been announced but is not in production. Samples may or may not be available. OBSOLETE: TI has discontinued the production of the device. (2) Eco Plan - The planned eco-friendly classification: Pb-Free (RoHS) or Green (RoHS & no Sb/Br) - please check http://www.ti.com/productcontent for the latest availability information and additional product content details. TBD: The Pb-Free/Green conversion plan has not been defined. Pb-Free (RoHS): TI's terms "Lead-Free" or "Pb-Free" mean semiconductor products that are compatible with the current RoHS requirements for all 6 substances, including the requirement that lead not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, TI Pb-Free products are suitable for use in specified lead-free processes. Green (RoHS & no Sb/Br): TI defines "Green" to mean Pb-Free (RoHS compatible), and free of Bromine (Br) and Antimony (Sb) based flame retardants (Br or Sb do not exceed 0.1% by weight in homogeneous material) (3) MSL, Peak Temp. -- The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature. Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals. TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release. In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis. Addendum-Page 1 IMPORTANT NOTICE Texas Instruments Incorporated and its subsidiaries (TI) reserve the right to make corrections, modifications, enhancements, improvements, and other changes to its products and services at any time and to discontinue any product or service without notice. Customers should obtain the latest relevant information before placing orders and should verify that such information is current and complete. All products are sold subject to TI’s terms and conditions of sale supplied at the time of order acknowledgment. TI warrants performance of its hardware products to the specifications applicable at the time of sale in accordance with TI’s standard warranty. Testing and other quality control techniques are used to the extent TI deems necessary to support this warranty. Except where mandated by government requirements, testing of all parameters of each product is not necessarily performed. TI assumes no liability for applications assistance or customer product design. Customers are responsible for their products and applications using TI components. To minimize the risks associated with customer products and applications, customers should provide adequate design and operating safeguards. TI does not warrant or represent that any license, either express or implied, is granted under any TI patent right, copyright, mask work right, or other TI intellectual property right relating to any combination, machine, or process in which TI products or services are used. Information published by TI regarding third-party products or services does not constitute a license from TI to use such products or services or a warranty or endorsement thereof. Use of such information may require a license from a third party under the patents or other intellectual property of the third party, or a license from TI under the patents or other intellectual property of TI. Reproduction of information in TI data books or data sheets is permissible only if reproduction is without alteration and is accompanied by all associated warranties, conditions, limitations, and notices. Reproduction of this information with alteration is an unfair and deceptive business practice. TI is not responsible or liable for such altered documentation. Resale of TI products or services with statements different from or beyond the parameters stated by TI for that product or service voids all express and any implied warranties for the associated TI product or service and is an unfair and deceptive business practice. TI is not responsible or liable for any such statements. Following are URLs where you can obtain information on other Texas Instruments products and application solutions: Products Applications Amplifiers amplifier.ti.com Audio www.ti.com/audio Data Converters dataconverter.ti.com Automotive www.ti.com/automotive DSP dsp.ti.com Broadband www.ti.com/broadband Interface interface.ti.com Digital Control www.ti.com/digitalcontrol Logic logic.ti.com Military www.ti.com/military Power Mgmt power.ti.com Optical Networking www.ti.com/opticalnetwork Microcontrollers microcontroller.ti.com Security www.ti.com/security Telephony www.ti.com/telephony Video & Imaging www.ti.com/video Wireless www.ti.com/wireless Mailing Address: Texas Instruments Post Office Box 655303 Dallas, Texas 75265 Copyright 2005, Texas Instruments Incorporated