Home

ANALOG DEVICES AD706 handbook

1. 20 F 2 2 10 15 COMMON MODE VOLTAGE Volts NEGATIVE lg 0 5 15 10 TPC 9 Input Bias Current vs Common Mode Voltage REV 10 10 10 100 FREQUENCY Hz FREQUENCY Hz TIME Seconds TPC 10 Input Noise Voltage TPC 11 Input Noise Current TPC 12 0 1 Hz to 10 Hz Spectral Density Spectral Density Noise Voltage QUIESCENT CURRENT pA TPC 13 Quiescent Supply TPC 14 Common Mode Rejection TPC 15 Power Supply Rejection Current vs Supply Voltage Ratio vs Frequency Ratio vs Frequency m 120 Tot MALLET TL z 100 2 on Sy O z N mE O o HERR zo E HINT 5 lt O EF 1 5 55 AA SEE o lt 2 o JF O Oa 28 ma s PHIL i q 5 g O O 20 240 100 0 01 0 1 1 10 100 1k 10k100k 1M10M LOAD RESISTANCE FREQUENCY Hz SUPPLY VOLTAGE Volts TPC 16 Open Loop Gain vs Load TPC 17 Open Loop Gain and TPC 18 Output Voltage Swing vs Resistance vs Load Resistance Phase Shift vs Frequency Supply Voltage REV E _5_ 100 120 CROSSTALK dB 140 160 10 100 1k 10k 100k FREQUENCY Hz Figure 2a Crosstalk vs Frequency Vg O 1pF SINE WAVE GENERATOR CLOSED LOOP OUTPUT IMPEDANCE Q 1 Wa a iL A u LA l ALAS A lout 1mA 1 A 100 1k 10k 100k FREQUENCY Hz Figure 3 Magnitude of Closed Loop Output Impedance vs Frequency RF SQUARE WAVE Vs INPUT Figure 4a Unity Gain Follo
2. 4 Bentimbered PISlHfes ues ehren oo eee oes ee eee BES SS EEE rs EI NS PU PESE PSI Sm ee CE OE os 6 Updated OUTLINE DIMENSIONS 424223646144 62 645346604550 4504 ans aaa EOC SERES 9 10 02 Data Sheet changed from REV C to REV D Deleted S Lead CERDIP 0 8 Package a sun a osu C ac a whee en AAA A 8008 RV e ea Universal loa chis Rs CP 1 Edits to PRODUCT DESCRIPTION 2 52 23 doo pl shee ris oe hes setas ona Edita 16 SPECIFICATIONS zes op pliss ee ee ee ne ee ee Da gs Een Be oa an De ee wa 2 Edits to ABSOLUTE MAXIMUM RATINGS ocurriera ee erneute 3 dite 10 RDERINE SOT ana nano aora s a arcas 3 Updated OUTLINE DIMENSIONS 42 0000 00 004 0 00 au no dm a a Bas aachen a dd 15 www C 10 REV
3. Inverter Small se Response C 100 pF AD706 Figure 5d Unity Gain Inverter Small Signal Pulse Response C 1000 pF MR is still dependent Wpon the ratio matching of Resistors R1 through R4 Resistor values for this circuit using the optional gain resistor Rg can be calculated using YE WE y R1 R4 49 9 kQ 49 9 kQ 0 9G 1 99 8 kO 0 066 2 where The desired circuit gain Table I provides practical 1 resistance values Note that without resistor Rg R2 and R3 49 9 kQ G 1 Table I Operating Gains of Amplifiers Al and A2 and Practical 1 Resistor Values for the Circuit of Figure 6 Circuit Gain Ri R4 1 10 49 9 kQ 1 33 49 9 kQ 1 50 49 9 kQ 2 00 49 9 kQ 10 1 49 9 kQ 101 0 49 9 1001 49 9 kQ For a much more comprehensive discussion of in amp applica tions refer to the Instrumentation Amplifier Applications Guide available free from Analog Devices Inc AD706 R1 R2 el C3 Vs 1MO 1MQ 0 1 F INPUT O 3 ler Y c2T 1 2 1MO 1MO O y AD706 XU OT 2 4 C4 y 0706 7 OUTPUT WITHOUT THE NETWORK 6 PINS 1 AND 2 AND 6 AND 7 OF THE AD706 ARE TIED TOGETHER Uy Y Le IN y CAPACITORS C1 AND C2 R5 C5 ARE SOUTHERN ELECTRONICS 2MO 0 01uF SUN MPCC POLYCARB 5 50V X OPTIONAL BALANCE Figure 7 1 Hz 1 Hz 4 Pole Active Filter Figure 7 shows the AD706 in an active filter application An important characteristic of the AD706 is that both the input
4. Stresses above those listed under Absolute Maximum Ratings may cause perma nent damage to the device This is a stress rating only functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied Exposure to absolute maximum rating conditions for extended periods may affect device reliability Specification is for device in free air 8 Lead Plastic Package 100 C W 8 Lead Small Outline Package 0 155 C W gt The input pins of this amplifier are protected by back to back diodes If the differential voltage exceeds 0 7 V external series protection resistors should be added to limit the input current to less than 25 mA CAUTION Dimensions shown in inches and mm Contact factory for latest dimensions u A AAA OUTPUT A 0 118 3 00 INPUT A OUTPUT B INPUT A INPUT B INPUT B 0 074 1 88 ESD electrostatic discharge sensitive device Electrostatic charges as high as 4000 V readily accumulate on the human body and test equipment and can discharge without detection Although the AD706 features proprietary ESD protection circuitry permanent damage may occur on devices subjected to high energy electrostatic discharges Therefore proper ESD precautions are recommended to avoid performance degradation or loss of functionality REV E 3 WARNING ESD SENSITIVE DEVICE AD706 Typical Perfo
5. bias current input offset current and their drift remain low over most of the op amp s rated temperature range Therefore for most applications there is no need to use the normal balancing resistor Adding the balancing resistor enhances performance at high temperatures as shown by Figure 8 lt RESISTOR NETWORKS 4 Pole Active Filter 180 120 WITHOUT OPTIONAL NO BALANCE RESISTOR R3 60 NN WITH OPTIONAL BALANCE ETAN Fig of the 1 Hz OFFSET VOLTAGE OF FILTER CIRCUIT RTI pV Filter Table II 1 Hz 4 Pole Low Pass Filter Recommended Component Values Section 1 Section 2 Desired Low Frequency Frequency C4 Pass Response Hz Hz WF Bessel 0 0616 Butterworth 0 0609 0 1 dB Chebychev 0 0385 0 2 dB Chebychev 0 0347 0 5 dB Chebychev 0 0290 1 0 dB Chebychev 0 0242 NOTE Specified Values are for a 3 dB point of 1 0 Hz For other frequencies simply scale capacitors C1 through C4 directly i e for 3 Hz Bessel response C1 0 0387 uF C2 0 0357 uF C3 0 0533 uF C4 0 0205 uP REV REV E OUTLINE DIMENSIONS 8 Lead Standard Small Outline Package SOIC R 8 Dimensions shown in millimeters and inches 5 00 0 1968 NU 80 0 meo 6 20 0 2440 3 80 0 1497 5 80 0 2284 y e E m 1 27 0 0500 0 50 0 0196 BSC 1 75 0 0688 0 25 0 0099 0 25 0 0099 0 25 0 0098 1 35 0 0532 0 10 0 0040 Y 0 51 0 0201 448 me COPLANARITY I
6. ANALOG DEVICES Dual Picoampere Input Current Bipolar Op Amp AD 706 FEATURES High DC Precision 100 Max Offset Voltage 1 5 Max Offset Drift 200 pA Max Input Bias Current 0 5 uV p p Voltage Noise 0 1 Hz to 10 Hz 750 pA Supply Current Available in 8 Lead Plastic Mini DIP and Surface Mount SOIC Packages Available in Tape and Reel in Accordance with EIA 481A Standard Quad Version AD704 APPLICATIONS Low Frequency Active Filters Precision Instrumentation Precision Integrators GENERAL DESCRIPTION The AD706 is a dual low power bipolar op amp that has the low input bias current of a JEET amplifier but which offers a significantly Ig drift over Pa superbe bipolar inp St e pid a levels similagt 1 plifi while its Ip pi n ses BY JFET amp for ich Ig doubles every 10 C for a 1000X increase at 125 C The AD706 also achieves the microvolt offset voltage and low noise characteristics of a precision bipolar input amplifier Since it has lt 200 pA of bias current the AD706 does not require the commonly used balancing resistor Furthermore the current noise is only 50 fANHz which makes this amplifier usable with very high source impedances At 600 A max supply current per amplifier the AD706 is well suited for today s high density boards The AD706 is an excellent choice for use in low frequency active filters in 12 bit and 14 bit data acquisition systems in precision ins
7. N BOSE 0 25 0 0098 0 1 27 0 0500 SEATING 0 31 0 0122 do 0 10 0 17 0 0067 0 40 0 0157 PLANE 17 0 0067 COMPLIANT TO JEDEC STANDARDS MS 012AA CONTROLLING DIMENSIONS ARE IN MILLIMETERS INCH DIMENSIONS IN PARENTHESES ARE ROUNDED OFF MILLIMETER EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN 8 Lead Plastic Dual in Line Package PDIP N 8 Dimensions shown in inches and millimeters 0 295 7 49 0 285 7 24 0 275 6 98 0 325 8 26 0 310 7 87 0 130 3 30 PLANE 0 008 0 20 0 110 2 79 0 060 1 52 0 022 0 56 0 050 1 27 0 018 0 46 0 045 1 14 0 014 0 36 COMPLIANT TO JEDEC STANDARDS MO 095AA CONTROLLING DIMENSIONS ARE IN INCHES MILLIMETER DIMENSIONS IN PARENTHESES ARE ROUNDED OFF INCH EQUIVALENTS FOR REFERENCE ONLY AND ARE NOT APPROPRIATE FOR USE IN DESIGN com AD 0 300 7 62 0 150 3 81 0 135 3 43 0 015 0 120 3 05 0 180 0 38 4 57 MIN MAX 0 015 0 38 0 150 3 81 M c 0 010 0 25 AD706 AD706 Revision History Location Page 10 03 Data Sheet changed from REV D to REV E the k ISI 1727771 ee OE a Mee eS ea eee a da ee de Universal Updated Pea ORES MS 2329729523992 925229254 52m 225 39 2 23 IRE 2 1 9 93 93785 XO ERR errata 1 Updated PRODUCT DESCRIPTION ari Bun ach a 1 Remumibercd IPCs orP n
8. d MA 02062 9106 U S A Tel 781 329 4700 www analog com Fax 781 326 8703 2003 Analog Devices Inc All rights reserved ADIO06 SPEC F CATI 0 NS T 25 C Vey 0 V and 15 V dc unless otherwise noted Parameter Conditions Min Typ Max INPUT OFFSET VOLTAGE Initial Offset Offset to Tmax vs Temperature Average TC vs Supply PSRR Vs 2Vto 18V Tun to Vs 2 5 V to 18 V Long Term Stability INPUT BIAS CURRENT 0 V Vom 13 5 V vs Temperature Average TC Tmn to Tmax Vom 0 V T MIN to Tmax Vom 1135 INPUT OFFSET CURRENT Vem 0V Vom 13 5 V vs Temperature Average TC to TMAX VcM 0V Tun to T max Vom 13 5 MATCHING CHARACTERISTICS Offset Voltage Tmn to Tmax Input Bias Current Tmn to Tmax Common Mode Rejection Tmn to Tmax Power Supply Rejection Crosstalk Fi 7 A A FREQUENCY RESPONSE Y Unity Gain Crossover Frequency Slew Rate G 1 Tmn to Tmax INPUT IMPEDANCE Differential 40 2 Common Mode 300 2 INPUT VOLTAGE RANGE Common Mode Voltage 13 5 14 Common Mode Rejection Ratio Vom 13 5 V 110 132 Tmn to Tmax 108 128 INPUT CURRENT NOISE 0 1 Hz to 10 Hz 3 f 10 Hz 50 INPUT VOLTAGE NOISE 0 1 Hz to 10 Hz f 10 Hz f 1 kHz OPEN LOOP GAIN Vo 12 V 10 Tmn to Tmax Vo 10 V 2 kQ Tmn to Tmax OUTPUT CHARACTERISTICS Voltage Swing Rioap 10 Tmn to Tmax Current Short Circuit Capacitive Load Dr
9. ive Capability Gain 1 GQ pF REV AD706 SPECIFICATIONS continues Parameter Conditions Min Typ Max Unit POWER SUPPLY Rated Performance V Operating Range V Quiescent Current Total mA to Tmax mA TRANSISTOR COUNT NOTES Bias current specifications are guaranteed maximum at either input Input bias current match is the difference between corresponding inputs Ig of IN of Amplifier 1 minus Ig of IN of Amplifier 2 R 8 Operating ox AM OS AVosz CMRR match is the difference between for Amplifier 1 and for Amplifier 2 expressed in dB CM CM AV os AVos PSRR match is the difference between for Amplifier 1 and for Amplifier 2 expressed in dB AVsuppr y AVsuppr y All min and max specifications are guaranteed Specifications subject to change without notice ORDERING GUIDE ABSOLUTE MAXIMUM RATINGS Temperature Package SUPDIY Voltage 24 3 ao Bnew rs 18 V Model Range Description Option Int LP Dissipati d Total Bo i fiers 650 mw AD706IN 0 C to 70 C Plastic DIP N 8 oe DIE TE sadi ees AD706JR 0 C to 70 C SOIC R 8 Di ie pe ae ee Een Een Das I wa IVs AD706 R REEL 0 C to 70 C Tape and Res Ros en nn D706 R REEL7 ape R 8 Storage Te ln Gos po D7 R D70 5 DID POST error UR AA RA a AD706A en A oT e an Lead Temperature Soldering 10 secs 300 C Lead free part NOTES METALIZATION PHOTOGRAPH
10. rmance Characteristics Default Conditions 5 V 5 pF G 2 R Ry 1 KO Ri 2 Vo 2 V p p Frequency 1 MHz T 25 C 1000 samete E SIZE 5100 1000 800 NUMBER OF UNITS 200 INPUT COMMON MODE VOLTAGE LIMIT Volts REFERRED TO SUPPLY VOLTAGES TPC 4 Input Common Mode Voltage SAMPLE SIZE 3000 80 40 0 40 80 INPUT OFFSET VOLTAGE pV TPC 1 Typical Distribution of Input Offset Voltage 0 5 10 15 SUPPLY VOLTAGE Volts Range vs Supply Voltage NUMBER OF UNITS 55 C TO 125 C Sampiesme ors 0 8 0 4 0 0 4 0 8 OFFSET VOLTAGE DRIFT V C TPC 7 Typical Distribution of Offset Voltage Drift 20 NUMBER OF UNITS 160 80 0 80 160 INPUT BIAS CURRENT pA TPC 2 Typical Distribution of Input Bias Current 1k 10k 100k 1M FREQUENCY Hz TPC 5 Large Signal Frequency Response CHANGE IN OFFSET VOLTAGE pV WARM UP TIME Minutes TPC 8 Change in Input Offset Voltage vs Warm Up Time E NUMBER OF UNITS d LL LLL LL LLL LLL LLL 120 60 0 60 120 INPUT OFFSET CURRENT pA TPC 3 Typical Distribution of Input Offset Current SOURCE RESISTANCE MAY BE EITHER BALANCED OR UNBALANCED FOR INDUSTRIAL TEMPERATURE VOLTAGE DRIFT pV C SOURCE RESISTANCE Q TPC 6 Offset Voltage Drift vs Source Hesistance 60 40 E IL 20 POSITIVE Ig Ww oc 2 T o lt m
11. trumentation and as a high quality integrator The AD706 is internally compensated for unity gain and is available in five performance grades The AD706 J is rated over the commercial temperature range of 0 C to 70 C The AD706A is rated for the extended industrial temperature range of 40 C to 85 C The AD706 is offered in two varieties of an 8 lead package plastic mini DIP and surface mount SOIC REV E Information furnished by Analog Devices is believed to be accurate and reliable However no responsibility is assumed by Analog Devices for its use norfor any infringements of patents or other rights ofthird parties that may result from its use No 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 CONNECTION DIAGRAM Plastic Mini DIP N and Plastic SOIC R Packages AMPLIFIER 1 AMPLIFIER 2 PRODUCT HIGHLIGHTS 1 The AD706 is a dual low drift op amp that offers JFET level input bias currents yet has the low Ig drift of a bipolar amplifier It may be used in ci dual op amps dc precision 3 The AD706 can be used in applications where a chopper amplifier would normally be required but without the chopper s inherent noise TYPICAL Ig nA 55 25 110 125 TEMPERATURE C Figure 1 Input Bias Current vs Temperature One Technology Way P O Box 9106 Norwoo
12. wer For large signal applications resistor R limits the current through the input protection diodes Figure 4b Unity Gain Follower Large Signal Pulse Response Rr 10 Figure 4c Unity Gain Follower Small Signal Pulse Response C 1 000 pF 00 Ci 100 pF Figure 4d Unity Gain Follower Small Signal Pulse Response Re 0Q C 1000 pF REV 10k0 SQUARE WAVE INPUT 4 alu i sl Figure 5b Unity Gain Inverter Large Signal Pulse Response C 1 000 pF GB Ell Yi VAY VAY VAY M 1 Figure 6 shows an n amp circuit that has the obvious advantage of requiring only one AD706 rather than three op amps with subsequent savings in cost and power consumption The transfer function of this circuit without is Vour Un Vina for R1 R4 and R2 R3 Input resistance is high thus permitting the signal source to have an unbalanced output impedance R4 Le R3 O OUTPUT O 0 1uF 1kQ V Vout Vina Vina 14 82 283 FOR R1 R4 R2 R3 G OPTIONAL INPUT PROTECTION RESISTOR FOR GAINS GREATER THAN 100 OR INPUT VOLTAGES EXCEEDING THE SUPPLY VOLTAGE Figure 6 Two Op Amp Instrumentation Amplifier Furthermore the circuit gain may be fine trimmed using an optional trim resistor Rg Like the three op amp circuit CMR increases with gain once initial trimming is accomplished but REV E 7 Figure 5 Unity Gain

ANALOG DEVICES AD706 handbook

Contents

Download Pdf Manuals

Related Search

Related Contents