Instruction/ maintenance manual of the product AD620 Analog Devices
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CONNECTION DIAGRAM 8-Lead Plastic Mini-DIP (N), Cerdip (Q) and SOIC (R) Packages –IN R G –V S +IN R G +V S OUTPUT REF 1 2 3 4 8 7 6 5 AD620 TOP VIEW REV.
AD620–SPECIFICA TIONS (Typical @ +25 8 C, V S = 6 15 V, and R L = 2 k V , unless otherwise noted) AD620A AD620B AD620S 1 Model Conditions Min Typ Max Min Typ Max Min Typ Max Units GAIN G = 1 + (49.4 k/R G ) Gain Range 1 10,000 1 10,000 1 10,000 Gain Error 2 V OUT = ± 10 V G = 1 0.
AD620 AD620A AD620B AD620S 1 Model Conditions Min Typ Max Min Typ Max Min Typ Max Units DYNAMIC RESPONSE Small Signal –3 dB Bandwidth G = 1 1000 1000 1000 kHz G = 10 800 800 800 kHz G = 100 120 120 120 kHz G = 1000 12 12 12 kHz Slew Rate 0.75 1.2 0.
AD620 REV. E –4– NOTES 1 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.
AD620 REV. E –5– T ypical Characteristics (@ +25 8 C, V S = 6 15 V, R L = 2 k V , unless otherwise noted) INPUT OFFSET VOLTAGE – m V 20 30 40 50 –40 0 +40 +80 PERCENTAGE OF UNITS –80 SAMPLE SIZE = 360 10 0 Figure 3.
AD620–T ypical Characteristics FREQUENCY – Hz 1000 100 10 1 10 1000 100 CURRENT NOISE – fA/ ! Hz Figure 9. Current Noise Spectral Density vs. Frequency RTI NOISE – 2.0 m V/DIV TIME – 1 SEC/DIV Figure 10a. 0.1 Hz to 10 Hz RTI Voltage Noise (G = 1) RTI NOISE – 0.
AD620 REV. E –7– FREQUENCY – Hz PSR – dB 160 1M 80 40 1 60 0.1 140 100 120 100k 10k 1k 100 10 20 G = 1000 G = 100 G = 10 G = 1 180 Figure 14. Positive PSR vs. Frequency, RTI (G = 1–1000) FREQUENCY – Hz PSR – dB 160 1M 80 40 1 60 0.1 140 100 120 100k 10k 1k 100 10 20 180 G = 10 G = 100 G = 1 G = 1000 Figure 15.
AD620 REV. E –8– OUTPUT VOLTAGE SWING – Volts p-p LOAD RESISTANCE – V 30 0 0 10k 20 10 100 1k V S = 6 15V G = 10 Figure 20. Output Voltage Swing vs. Load Resistance .... .... .... .... .... .... .... .... .... .... .... .... .... .... .... ...
AD620 REV. E –9– .... .... .... .... .... .... .... .... ........ .... .... .... .... .... .... .... .... ........ Figure 26. Small Signal Pulse Response, G = 100, R L = 2 k Ω , C L = 100 pF .... .... .... .... .... .... .... .... .... .... ....
AD620 REV. E –10– V B –V S A1 A2 A3 C2 R G R1 R2 GAIN SENSE GAIN SENSE R3 400 V 10k V 10k V I2 I1 10k V REF 10k V +IN – IN 20 m A 20 m A R4 400 V OUTPUT C1 Q2 Q1 Figure 33. Simplified Schematic of AD620 THEORY OF OPERATION The AD620 is a monolithic instrumentation amplifier based on a modification of the classic three op amp approach.
AD620 REV. E –11– Make vs. Buy: A Typical Bridge Application Error Budget The AD620 offers improved performance over “homebrew” three op amp IA designs, along with smaller size, fewer compo- nents and 10 × lower supply current.
AD620 REV. E –12– 3k V +5V DIGITAL DATA OUTPUT ADC REF IN AGND 20k V 10k V 20k V AD620B G=100 1.7mA 0.10mA 0.6mA MAX 499 V 3k V 3k V 3k V 2 1 8 3 7 6 5 4 1.
AD620 REV. E –13– Precision V-I Converter Th e AD620, along with an other op amp and tw o resistors, makes a precision current source (Figure 37). The op amp buffers the reference terminal to maintain good CMR. The output voltage V X of the AD620 appears across R1, which converts it to a curre nt.
AD620 REV. E –14– COMMON-MODE REJECTION Instrumentation amplifiers like the AD620 offer high CMR, which is a measure of the change in output voltage when both inputs are changed by equal amounts. These specifications are usually given for a full-range input voltage change and a speci- fied source imbalance.
AD620 REV. E –15– GROUND RETURNS FOR INPUT BIAS CURRENTS Input bias currents are those currents necessary to bias the input transistors of an amplifier.
AD620 REV. E –16– OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N-8) Package 8 14 5 0.430 (10.92) 0.348 (8.84) 0.280 (7.11) 0.240 (6.10) PIN 1 SEATING PLANE 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.
An important point after buying a device Analog Devices AD620 (or even before the purchase) is to read its user manual. We should do this for several simple reasons:
If you have not bought Analog Devices AD620 yet, this is a good time to familiarize yourself with the basic data on the product. First of all view first pages of the manual, you can find above. You should find there the most important technical data Analog Devices AD620 - thus you can check whether the hardware meets your expectations. When delving into next pages of the user manual, Analog Devices AD620 you will learn all the available features of the product, as well as information on its operation. The information that you get Analog Devices AD620 will certainly help you make a decision on the purchase.
If you already are a holder of Analog Devices AD620, but have not read the manual yet, you should do it for the reasons described above. You will learn then if you properly used the available features, and whether you have not made any mistakes, which can shorten the lifetime Analog Devices AD620.
However, one of the most important roles played by the user manual is to help in solving problems with Analog Devices AD620. Almost always you will find there Troubleshooting, which are the most frequently occurring failures and malfunctions of the device Analog Devices AD620 along with tips on how to solve them. Even if you fail to solve the problem, the manual will show you a further procedure – contact to the customer service center or the nearest service center
