INA106

®INA106INA106INA106Precision Gain = 10 DIFFERENTIAL AMPLIFIERFEATURESqACCURATE GAIN: ±0.025% maxqHIGH COMMON-MODE REJECTION:86dB minqNONLINEARITY: 0.001% maxqEASY TO USEqPLASTIC 8-PIN DIP, SO-8 SOICPACKAGESAPPLICATIONSqqqqqG = 10 DIFFERENTIAL AMPLIFIERG = +10 AMPLIFIERG = –10 AMPLIFIERG = +11 AMPLIFIERINSTRUMENTATION AMPLIFIERDESCRIPTIONThe INA106 is a monolithic Gain = 10 differentialamplifier consisting of a precision op amp and on-chipmetal film resistors. The resistors are laser trimmedfor accurate gain and high common-mode rejection.Excellent TCR tracking of the resistors maintainsgain accuracy and common-mode rejection overtemperature.The differential amplifier is the foundation of manycommonly used circuits. The INA106 provides thisprecision circuit function without using an expensiveresistor network. The INA106 is available in 8-pinplastic DIP and SO-8 surface-mount packages.–In2R110kΩR2100kΩ573R310kΩR4100kΩ1SenseV+OutputV–Reference+InInternational 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: 910-952-1111Internet: http://www.burr-brown.com/ • FAXLine: (800) 548-6133 (US/Canada Only) • Cable: BBRCORP • Telex: 066-91 • FAX: (520) 8-1510 • Immediate Product Info: (800) 548-6132©

1987 Burr-Brown CorporationPDS-729F Printed in U.S.A. August, 1998

SPECIFICATIONS

ELECTRICAL

At +25°C, VS = ±15V, unless otherwise specified.

INA106KP, UPARAMETERGAINInitial(1)Error vs TemperatureNonlinearity(2)OUTPUTRelated VoltageRated CurrentImpedanceCurrent LimitCapacitive LoadINPUTImpedanceVoltage RangeCommon-Mode Rejection(3)OFFSET VOLTAGEInitial vs Temperature vs Supply vs TimeNOISE VOLTAGEfB = 0.01Hz to 10HzfO = 10kHzDYNAMIC RESPONSESmall SignalFull Power BWSlew RateSettling Time:0.1%0.01%0.01%POWER SUPPLYRatedVoltage RangeQuiescent CurrentTEMPERATURE RANGESpecificationOperationStorageIO = +20mA, –5mAVO = 10VTo CommonStable OperationDifferentialCommon-ModeDifferentialCommon-ModeTA = TMIN to TMAXRTI(4)500.2110130–3dBVO = 20Vp-pVO = 10V StepVO = 10V StepVCM = 10V Step, VDIFF = 0V55035105±15Derated PerformanceVO = 0V±5±1.50–40–65±18±2+70+85+15020010µVµV/°CµV/VµV/moµVp-pnV/√HzMHzkHzV/µsµsµsµsVVmA°C°C°C10+20, –5CONDITIONSMINTYP100.01–40.0002120.01+40/–10100010110±1±1186MAXUNITSV/V%ppm/°C%VmAΩmApFkΩkΩVVdB0.0250.001100±VS = 6V to 18VRTI(5)302NOTES: (1) Connected as difference amplifier (see Figure 1). (2) Nonlinearity is the maximum peak deviation from the best-fit straight line as a percent of full-scale peak-to-peak output. (3) With zero source impedance (see “Maintaining CMR” section). (4) Includes effects of amplifiers’s input bias and offset currents. (5) Includes effectof amplifier’s input current noise and thermal noise contribution of resistor network.

®INA106

2

PIN CONFIGURATION

Top ViewDIP/SOICELECTROSTATIC

DISCHARGE SENSITIVITY

This integral circuit can be damaged by ESD. Burr-Brownrecommends that all integrated circuits be handled withappropriate precautions. Failure to observe proper handlingand installation procedures can cause damage.

ESD damage can range from subtle performance degrada-tion to complete device failure. Precision integrated circuitsmay be more susceptible to damage because very smallparametric changes could cause the device not to meetpublished specifications.

PACKAGE/ORDERING INFORMATION

PACKAGEDRAWINGNUMBER(1)

006182

TEMPERATURE

RANGE0°C to +70°C0°C to +70°C

• (1)Ref110kΩ–In210kΩ+In3100kΩV–4INA1065Sense6Output100kΩ7V+8NCNOTE: (1) Pin 1 indentifier for SO-8 package.Model number identification may be abbreviatedon SO-8 package due to limited available space.ABSOLUTE MAXIMUM RATINGS

Power Supply Voltage......................................................................±18VInput Voltage Range............................................................................±VSOperating Temperature Range:P, U................................–40°C to +85°CStorage Temperature Range............................................–40°C to +85°CLead Temperature (soldering, 10s): P..........................................+300°CWave Soldering (3s, max) U..........................................................+260°COutput Short Circuit to Common..............................................Continuous

PRODUCTINA106KPINA106U

PACKAGE8-Pin Plastic DIPSO-8 Surface Mount

NOTE: (1) For detailed drawing and dimension table, please see end of datasheet, or Appendix C of Burr-Brown IC Data Book.

The information provided herein is believed to be reliable; however, BURR-BROWN assumes no responsibility for inaccuracies or omissions. BURR-BROWNassumes 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 subjectto 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 notauthorize or warrant any BURR-BROWN product for use in life support devices and/or systems.

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INA106

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = ±15V, unless otherwise noted.

STEP RESPONSE

2µs/div

SMALL SIGNAL RESPONSE(RLOAD = ∞, CLOAD = 100pF)

50)Vm( egatlo0

V tuptuO–50

2µs/div

MAXIMUM VOUT vs IOUT(Negative Swing)–17.5–15VS = ±18V–12.5VS = ±15V)V(–10V S = ±12VTUOV–7.5–5–2.5VS = ±5V00–2–4–6–8–10–12–IOUT (mA)®INA106

SMALL SIGNAL RESPONSE

(No Load)

50)Vm( egatlo0

V tuptuO–50

2µs/div

TOTAL HARMONIC DISTORTION AND NOISE vs FREQUENCY1A = 20dB, 3Vrms, 10kΩ load)%0.1( N + DHTNoninvertingInverting0.0130kHz low-pass filtered0.0011k10k100kFrequency (Hz)MAXIMUM VOUT vs IOUT

(Positive Swing)

17.5

15VS = ±18V12.5)VS = ±15VV(10 TUOV7.5VS = ±12V5

2.5V0

S = ±5V0

6

12

1824

30

36

IOUT (mA)

4

TYPICAL PERFORMANCE CURVES (CONT)

At TA = +25°C, VS = ±15V, unless otherwise noted.

CMR vs FREQUENCY110100)Bd90( RMC807060101001k10k100kFrequency (Hz)APPLICATIONS INFORMATION

Figure 1 shows the basic connections required for operationof the INA106. Power supply bypass capacitors should beconnected close to the device pins as shown.

V–V+1µF1µF47INA106R1R2210kΩ100kΩV25R36V3310kΩ+–VOUT = 10(V3 –V2)R4100kΩ1FIGURE 1. Basic Power Supply and Signal Connections.The differential input signal is connected to pins 2 and 3 asshown. The source impedance connected to the inputs mustbe equal to assure good common-mode rejection. A 5Ωmismatch in source impedance will degrade the common-mode rejection of a typical device to approximately 86dB. Ifthe source has a known source impedance mismatch, anadditional resistor in series with one input can be used topreserve good common-mode rejection.

The output is referred to the output reference terminal(pin 1) which is normally grounded. A voltage applied to the

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POWER SUPPLY REJECTION vs FREQUENCY140120)Bd100( RRV–SP8060V+401101001k10k100kFrequency (Hz)Ref terminal will be summed with the output signal. Thesource impedance of a signal applied to the Ref terminalshould be less than 10Ω to maintain good common-moderejection.

Figure 2 shows a voltage applied to pin 1 to trim the offsetvoltage of the INA106. The known 100Ω source impedanceof the trim circuit is compensated by the 10Ω resistor inseries with pin 3 to maintain good CMR.

INA106R1R2V22510ΩROV3336VCompensates forsome impedanceR4at pin 1. See text.+15V1499kΩVO = V2 – V3Offset Adjustment Range = ±3mV100kΩ100Ω–15VFIGURE 2. Offset Adjustment.

Referring to Figure 1, the CMR depends upon the match ofthe internal R4/R3 ratio to the R1/R2 ratio. A CMR of 106dBrequires resistor matching of 0.005%. To maintain highCMR over temperature, the resistor TCR tracking must bebetter than 2ppm/°C. These accuracies are difficult andexpensive to reliably achieve with discrete components.

®INA106

INA106V110Ω210kΩ100kΩ5Gain200ΩAdjust6E0V210Ω310kΩ100kΩ1CMR200ΩAdjustTo eliminate adjustment interactions,first adjust gain with V2 grounded.FIGURE 3. Difference Amplifier with Gain and CMR Adjust.

INA106V2210kΩ100kΩ56VOVO = –10V210kΩ100kΩ31Gain Error = 0.01% maximumNonlinearity = 0.001% maximumGain Drift = 2.ppm/°CFIGURE 4. Precision G = –10 Inverting Amplifier.

INA106R1R2210kΩ100kΩ5R4V6VOIN1100kΩVO = VIN±100VRSafe Input310kΩ3This circuit follows an 11/1 divider with a gain of 11 for an overall gain of unity.With an 11/1 divider, the input signal can exceed 100V without damage.FIGURE 5. Voltage Follower with Input Protection.

®INA106

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E1–InA1INA106R225R61ER02Output31A2E0 = 10(1 + 2R2 /R1) (E2 – E1)E2+InTo make a high performance high gain instrumentation amplifier, the INA106can be combined with state-of-the-art op amps. For low source impedanceapplications, OPA37s will give the best noise, offset, and temperature drift. Atsource impedances above about 10kΩ, the bias current noise of the OPA37reacting with input impedance degrades noise. For these applications, use anOPA111 or a dual OPA2111 FET input op amp for lower noise. For anelectrometer grade IA, use the OPA128—see table below.Using the INA106 for the difference amplifier also extends the input common-mode range of the instrumentation amplifier to ±10V. A conventional IA witha unity-gain difference amplifier has an input common-mode range limited to±5V for an output swing of ±10V. This is because a unity-gain difference ampneeds ±5V at the input for 10V at the output, allowing only 5V additional forcommon-mode.R1R2GAINCMRRNOISE AT 1kHzA1, A2(Ω)(kΩ)(V/V)(dB)Ib (pA)(nV/ √Hz)OPA37A50.52.51000128400004OPA111B202101000110110OPA128LM2021010001180.07538FIGURE 6. Precision Instrumentation Amplifier.

INA106R1R2210kΩ100kΩ5R4V6V011100kΩV0 = V1 + 10 V3R3V3310kΩFIGURE 7. Precision Summing Amplifier.

INA1062561VOVVINO = 11VIN3Gain Error =0.01% maximumFIGURE 8. Precision G = 11 Buffer.