Dual Picoampere Input Current Bipolar Op Amp Data Sheet AD706 CONNECTION DIAGRAM FEATURES High DC Precision PDIP (N) and Plastic SOIC 100 V Max Offset Voltage 1.5 V/ C Max Offset Drift (R) Packages 200 pA Max Input Bias Current 0.5 V p-p Voltage Noise, 0.1 Hz to 10 Hz AMPLIFIER 1 AMPLIFIER 2 750 A Supply Current AD706 OUTPUT 1 8 V Available in 8-Lead PDlP and Surface-Mount (SOIC) Packages IN 2 7 OUTPUT Available in Tape and Reel in Accordance with IN IN 3 6 EIA-481A Standard V IN 4 5 Quad Version: AD704 TOP VIEW APPLICATIONS Low Frequency Active Filters Precision Instrumentation Precision Integrators GENERAL DESCRIPTION PRODUCT HIGHLIGHTS The AD706 is a dual, low power, bipolar op amp that has the 1. The AD706 is a dual low drift op amp that offers JFET low input bias current of a JFET amplifier, but which offers a level input bias currents, yet has the low I drift of a bipolar B Dual Picoampere Input Current Data Sheet Bipolar Op AmpAD706 ITrrRev.linesicrgademfeohpnrmats oonsse F ifarsi t bthio gksilirrniant andd yfurn ipartse ad rssuti egshbiesyiemed b st thimpde baredtyl mic Ay atra tAnadyion ranelaemao osulog gr Dl otrks fDetrehov arvemicircewe iets theis fs sisusee o beun pr it.r Sos usedlippeeeerr anvciedt,f ynor fica y oft opat theio obetner ansin ar sut r oceycbjsp infru paereacrinct tttteeigevo anDocument Feedbane ct o rmenhdiwneang rhgettss lersi oa wo. bff Ai lepthan. Hotaenuloot ntwgs Doeotivr eceoverti,. ncheck Nesoor. OT T eene Tl:chnical 781.echnology 329. Suppor4700tWay, P2002.O. B20ox 9117 A06,nal Norog Devicewood,s, MA 020 Inc. Alwww.analog.coml r62-ights r9106,eser U.vedS.A.. significantly lower I drift over temperature. It utilizes superbeta amplifier. It may be used in circuits using dual op amps B bipolar input transistors to achieve picoampere input bias current such as the LT1024. levels (similar to FET input amplifiers at room temperature), 2. The AD706 provides both low drift and high dc precision. while its I typically only increases by 5 at 125C (unlike a B 3. The AD706 can be used in applications where a chopper JFET amp, for which I doubles every 10C for a 1000 B amplifier would normally be required but without the increase at 125C). The AD706 also achieves the microvolt choppers inherent noise. offset voltage and low noise characteristics of a precision bipolar input amplifier. Since it has < 200 pA of bias current, the AD706 does not 100 require the commonly used balancing resistor. Furthermore, the current noise is only 50 fA/Hz, which makes this amplifier usable with very high source impedances. At 600 A max supply 10 current (per amplifier), the AD706 is well suited for todays high density boards. TYPICAL JFET AMP The AD706 is an excellent choice for use in low frequency 1 active filters in 12-bit and 14-bit data acquisition systems, in precision instrumentation, and as a high quality integrator. The AD706 is internally compensated for unity gain and is available 0.1 in five performance grades. The AD706J is rated over the commercial temperature range of 0C to +70C. The AD706A is AD706 rated for the extended industrial temperature range of 40C to +85C. 0.01 55 +25 +110 +125 TEMPERATURE C The AD706 is offered in two varieties of an 8-lead package: PDIP and surface-mount (SOIC). Figure 1. Input Bias Current vs. Temperature Rev. G Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 20022018 Analog Devices, Inc. All rights reserved. license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarks and registered trademarks are the property of their respective owners. Technical Support www.analog.com TYPICAL I nA B( T = +25 C, V = 0 V and 15 V dc, unless otherwise noted.) A CM AD706SPECIFICATIONS AD706J/A Parameter Conditions Min Typ Max Unit INPUT OFFSET VOLTAGE Initial Offset 30 100 V Offset T to T 40 150 V MIN MAX vs. Temperature, Average TC 0.2 1.5 V/C vs. Supply (PSRR) V = 2 V to 18 V 110 132 dB S T to T V = 2.5 V to 18 V 106 126 dB MIN MAX S Long Term Stability 0.3 V/Month 1 INPUT BIAS CURRENT V = 0 V 50 200 pA CM V = 13.5 V 250 pA CM vs. Temperature, Average TC 0.3 pA/C T to T V = 0 V 300 pA MIN MAX CM T to T V = 13.5 V 400 pA MIN MAX CM INPUT OFFSET CURRENT V = 0 V 30 150 pA CM V = 13.5 V 250 pA CM vs. Temperature, Average TC 0.6 pA/C T to T V = 0 V 80 250 pA MIN MAX CM T to T V = 13.5 V 80 350 pA MIN MAX CM MATCHING CHARACTERISTICS Offset Voltage 150 V T to T 250 V MIN MAX 2 Input Bias Current 300 pA T to T 500 pA MIN MAX Common-Mode Rejection 106 dB T to T 106 dB MIN MAX Power Supply Rejection 106 dB T to T 104 dB MIN MAX Crosstalk (Figure 2a) f = 10 Hz R = 2 k 150 dB L FREQUENCY RESPONSE Unity Gain Crossover Frequency 0.8 MHz Slew Rate G = 1 0.15 V/s T to T 0.15 V/s MIN MAX INPUT IMPEDANCE Differential 40 2 M pF Common Mode 300 2 G pF INPUT VOLTAGE RANGE Common-Mode Voltage 13.5 14 V Common-Mode Rejection Ratio V = 13.5 V 110 132 dB CM T to T 108 128 dB MIN MAX INPUT CURRENT NOISE 0.1 Hz to 10 Hz 3 pA p-p f = 10 Hz 50 fA/Hz INPUT VOLTAGE NOISE 0.1 Hz to 10 Hz 0.5 V p-p f = 10 Hz 17 nV/Hz f = 1 kHz 15 22 nV/Hz OPEN-LOOP GAIN V = 12 V O R = 10 k 200 2000 V/mV LOAD T to T 150 1500 V/mV MIN MAX V = 10 V O R = 2 k 200 1000 V/mV LOAD T to T 150 1000 V/mV MIN MAX OUTPUT CHARACTERISTICS Voltage Swing R = 10 k 13 14 V LOAD T to T 13 14 V MIN MAX Current Short Circuit 15 mA Capacitive Load Drive Capability Gain = +1 10,000 pF 2 REV. 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