AD705JR

AD705 AD | Alldatasheet

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Tel: 617/329-4700 Fax: 617/326-8703 REV. B 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 rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Picoampere Input Current Bipolar Op Amp AD705

FEATURES

25 mV max Offset Voltage (AD705T) 0.6 mV/8C max Drift (AD705K/T) 100 pA max Input Bias Current (AD705K) 600 pA max I B Over MIL Temperature Range (AD705T) 114 dB min CMRR (AD705K/T) 114 dB min PSRR (AD705T)

200 V/mV min Open Loop Gain

0.5 mV p-p typ Noise, 0.1 Hz to 10 Hz 600 mA max Supply Current AC PERFORMANCE

0.15 V/ µ s Slew Rate

800 kHz Unity Gain Crossover Frequency 10,000 pF Capacitive Load Drive Capability Low Cost Available in 8-Pin Plastic Mini-DlP, Hermetic Cerdip and Surface Mount (SOIC) Packages MIL-STD-883B Processing Available Dual Version Available: AD706 Quad Version: AD704

APPLICATIONS

Low Frequency Active Filters Precision Instrumentation Precision Integrators CONNECTION DIAGRAM Plastic Mini-DIP (N) Cerdip (Q) and Plastic SOIC (R) Packages PRODUCT DESCRIPTION The AD705 is a low power bipolar op amp that has the low in- put bias current of a BiFET amplifier but which offers a signifi- cantly lower IB drift over temperature. The AD705 offers many of the advantages of BiFET and bipolar op amps without their inherent disadvantages. It utilizes superbeta bipolar input tran- sistors to achieve the picoampere input bias current levels of FET input amplifiers (at room temperature), while its I B typi- cally only increases 5 times vs. BiFET amplifiers which exhibit a 1000X increase over temperature. This means that, at room temperature, while a typical BiFET may have less I B than the AD705, the BiFET’s input current will increase to a level of several nA at +125 °C. Superbeta bipolar technology also per- mits the AD705 to achieve the microvolt offset voltage and low noise characteristics of a precision bipolar input amplifier. The AD705 is a high quality replacement for the industry- standard OP07 amplifier while drawing only one sixth of its power supply current. Since it has only 1/20th the input bias current of an OP07, the AD705 can be used with much higher source impedances, while providing the same level of dc preci- sion. In addition, since the input bias currents are at picoAmp levels, the commonly used “balancing” resistor (connected be- tween the noninverting input of a bipolar op amp and ground) is not required. The AD705 is an excellent choice for use in low frequency ac- tive filters in 12- and 14-bit data acquisition systems, in preci- sion instrumentation and as a high quality integrator. The AD705 is internally compensated for unity gain and is available in five performance grades. The AD705J and AD705K are rated over the commercial temperature range of 0 °C to +70°C. The AD705A and AD705B are rated over the industrial temperature range of –40°C to +85°C. The AD705T is rated over the military temperature range of –55 °C to +125°C and is available processed to MIL-STD-883B, Rev. C. The AD705 is offered in three varieties of 8-pin package: plastic DIP, hermetic cerdip and surface mount (SOIC). “J” grade chips are also available. PRODUCT HIGHLIGHTS 1. The AD705 is a low drift op amp that offers BiFET level input bias currents, yet has the low I B drift of a bipolar ampli- fier. It upgrades the performance of circuits using op amps such as the LT1012. 2. The combination of Analog Devices’ advanced superbeta processing technology and factory trimming provides both low drift and high dc precision. 3. The AD705 can be used in applications where a chopper am- plifier would normally be required but without the chopper’s inherent noise and other problems. OFFSET NULL –IN +IN OFFSET NULL OUTPUT OVER COMP TOP VIEW AD705

AD705–SPECIFICATIONS AD705J/A AD705K/B AD705T Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Units INPUT OFFSET VOLTAGE Initial Offset 30 90 10 35 10 25 µV Offset T MIN to TMAX 45 150 25 60 25 60 µV vs. Supply (PSRR) V S = ± 2 V to ± 18 V 110 129 110 129 114 129 dB TMIN to TMAX VS = ± 2.5 V to ± 18 V 108 126 108 126 108 126 dB Long Term Stability 0.3 0.3 0.3 µV/month INPUT BIAS CURRENT 1 VCM = 0 V 60 150 30 100 30 100 pA VCM = ± 13.5 V 80 200 50 150 50 150 pA vs. Temp, Average TC 0.3 0.3 0.6 pA/ °C T MIN to TMAX VCM = 0 V 80 250 50 150 90 600 pA T MIN to TMAX VCM = ± 13.5 V 100 450 70 350 120 750 pA INPUT OFFSET CURRENT V CM = 0 V 40 150 30 100 30 100 pA VCM = ± 13.5 V 40 200 30 150 30 150 pA vs. Temp, Average TC 0.3 0.3 0.4 pA/ °C TMIN to TMAX VCM = 0 V 80 250 50 150 80 250 pA TMIN to TMAX VCM = ± 13.5 V 80 450 50 350 80 450 pA FREQUENCY RESPONSE Unity Gain INPUT IMPEDANCE Differential 40 i2 4 0 i24 0 i2M Ω ipF Common Mode 300 i2 300 i2 300 i2G Ω ipF INPUT VOLTAGE RANGE Common-Mode Voltage ± 13.5 ± 14 ± 13.5 ± 14 ± 13.5 ± 14 V COMMON-MODE REJECTION RATIO V CM = ± 13.5 V 110 132 114 132 114 132 dB TMIN to TMAX 108 128 108 128 108 128 dB f = 10 Hz 17 17 17 nV/ √Hz f = 1 kHz 15 22 15 22 15 22 nV/ √Hz INPUT CURRENT NOISE f = 10 Hz 50 50 50 fA/ √Hz OPEN-LOOP GAIN V O = ± 12 V RLOAD = 10 kΩ 300 2000 400 2000 400 2000 V/mV TMIN to TMAX 200 1500 300 1500 300 1500 V/mV VO = ± 10 V RLOAD = 2 kΩ 200 1000 300 1000 300 1000 V/mV TMIN to TMAX 150 1000 200 1000 200 1000 V/mV OUTPUT CHARACTERISTICS Voltage Swing R LOAD = 10 kΩ± 13 ± 14 ± 13 ± 14 ± 13 ± 14 V TMIN to TMAX 613 ± 14 613 ± 14 613 ± 14 V Current Short Circuit ± 15 ± 15 ± 15 mA Capacitive Load Drive Capability Gain = +1 10,000 10,000 10,000 pF Output Resistance Open Loop 200 200 200 Ω POWER SUPPLY Rated Performance ± 15 ± 15 ± 15 V Operating Range 62.0 618 62.0 618 62.0 618 V Quiescent Current 380 600 380 600 380 600 µA TMIN to TMAX 400 800 400 800 400 800 µA TEMPERATURE RANGE FOR RATED PERFORMANCE Commercial (0 °C to +70 °C) AD705J AD705K Industrial (–40 °C to +85 °C) AD705A AD705B Military (–55°C to +125 °C) AD705T (@ TA = +258C, VCM = 0 V, and VS = 615 V dc, unless otherwise noted) REV. B–2–

Parameter Conditions Min Typ Max Min Typ Max Min Typ Max Units PACKAGE OPTIONS 8-Pin Cerdip (Q-8) AD705AQ AD705BQ AD705TQ 8-Pin Plastic Mini-DIP (N-8) AD705JN AD705KN 8-Pin SOIC (R-8) AD705JR Chips AD705JCHIPS TRANSISTOR COUNT # of Transistors 45 45 45 NOTES 1Bias current specifications are guaranteed maximum at either input. All min and max specifications are guaranteed Specifications in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. Specifications subject to change without notice. AD705 METALIZATION PHOTOGRAPH Dimensions shown in inches and (mm). ABSOLUTE MAXIMUM RATINGS 1 Operating Temperature Range NOTES 1Stresses above those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating only and 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. 2Specification is for device in free air: 8-Pin Plastic Package: θJA = 165°C/Watt 8-Pin Cerdip Package: θJA = 110°C/Watt 8-Pin Small Outline Package: θJA = 155°C/Watt 3The input pins of these amplifiers 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. REV. B –3– ORDERING GUIDE Temperature Package Package Model Range Description Option AD705AQ –40 °C to +85°C 8-Pin Ceramic DIP Q-8 AD705BQ –40 °C to +85°C 8-Pin Ceramic DIP Q-8 AD705JCHIPS 0 °C to +70°C Bare Die AD705JN 0 °C to +70°C 8-Pin Plastic DIP N-8 AD705JR 0 °C to +70°C 8-Pin Plastic SOIC R-8 AD705JR-REEL 0 °C to +70°C 8-Pin Plastic SOIC R-8 AD705JR-REEL7 0 °C to +70°C 8-Pin Plastic SOIC R-8 AD705KN 0 °C to +70°C 8-Pin Plastic DIP N-8 AD705TQ –55 °C to +125°C 8-Pin Ceramic DIP Q-8 AD705TQ/883B –55 °C to +125°C 8-Pin Ceramic DIP Q-8 WARNING! ESD SENSITIVE DEVICE CAUTION 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 AD705 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. NULL +VS VOUT NULL 1 –IN 2 +IN

5 OVER COMP

4 –VS 0.074 (1.88) 0.0677 (1.72)

Figure 1. Typical Distribution of Figure 4. Input Common-Mode Figure 7. Typical Distribution of Figure 2. Typical Distribution of Figure 5. Large Signal Frequency

0 CHANGE IN OFFSET VOLTAGE – µV

Figure 8. Change in Input Offset Figure 3. Typical Distribution of Figure 6. Offset Voltage Drift vs. Figure 9. Input Bias Current vs.

Figure 10. Input Noise Voltage

300 QUIESCENT CURRENT – µA

Figure 13. Quiescent Supply Figure 16. Open Loop Gain vs. Figure 11. Input Noise Current Figure 14. Common-Mode Figure 17. Open Loop Gain and Figure 12. 0.1 Hz to 10 Hz Noise Figure 15. Power Supply Rejection Figure 18. Output Voltage Limit vs.