Analog Devices AD620 - Manuals

Page 3 - Hz; NOTES

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 0.75 1.2 0.75 1.2 V/ µ s Settling Time to 0.01% 10 V ...

Page 4 - ABSOLUTE MAXIMUM RATINGS; Model; Die Form; Contact factory for latest dimensions.; CAUTION

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 thedevice at these or any other conditions above those indicated in the operationalsection of this specification is ...

Page 5 - Typical Characteristics; Figure 3. Typical Distribution of Input Offset Voltage; Figure 4. Typical Distribution of Input Bias Current; Figure 5. Typical Distribution of Input Offset Current; Figure 6. Input Bias Current vs. Temperature

AD620 REV. E – 5 – Typical 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. Typical Distribution of Input Offset Voltage INPUT BIAS CURRENT – pA 0 10 20 30 40 ...

Page 6 - AD620–Typical Characteristics; Figure 9. Current Noise Spectral Density vs. Frequency; Figure 12. Total Drift vs. Source Resistance; Source

AD620–Typical 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 – 0.1 m V/DIV TIME – 1 SEC/DIV Figure 10b. 0...

Page 7 - Figure 17. Large Signal Frequency Response

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 = 10...

Page 8 - Figure 20. Output Voltage Swing vs. Load Resistance

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 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ....

Page 10 - Figure 33. Simplified Schematic of AD620; THEORY OF OPERATION; Figure 32. Settling Time Test Circuit

AD620 REV. E – 1 0 – 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 ona modification...

Page 12 - ADC; Pressure Measurement; Figure 36. A Medical ECG Monitor Circuit

AD620 REV. E – 1 2 – 3k V +5V DIGITALDATAOUTPUT ADC REF IN AGND 20k V 10k V 20k V AD620B G=100 1.7mA 0.10mA 0.6mAMAX 499 V 3k V 3k V 3k V 2 1 8 3 7 6 5 4 1.3mA MAX AD705 Figure 35. A Pressure Monitor Circuit which Operates on a +5 V Single Supply Pressure Measurement Although useful in many bridge a...

Page 13 - Figure 38. Circuit to Attenuate RF Interference

AD620 REV. E – 1 3 – Precision V-I Converter The AD620, along with another op amp and two resistors, makesa precision current source (Figure 37). The op amp buffers thereference terminal to maintain good CMR. The output voltageV X of the AD620 appears across R1, which converts it to a current. This ...

Page 14 - COMMON-MODE REJECTION; Figure 39. Differential Shield Driver; GROUNDING; Figure 41. Basic Grounding Practice

AD620 REV. E – 1 4 – COMMON-MODE REJECTION Instrumentation amplifiers like the AD620 offer high CMR,which is a measure of the change in output voltage when bothinputs are changed by equal amounts. These specifications areusually given for a full-range input voltage change and a speci-fied source imb...

Page 15 - GROUND RETURNS FOR INPUT BIAS CURRENTS; Instrumentation Amplifier Application Guide

AD620 REV. E – 1 5 – GROUND RETURNS FOR INPUT BIAS CURRENTS Input bias currents are those currents necessary to bias the inputtransistors of an amplifier. There must be a direct return pathfor these currents; therefore, when amplifying “floating” input V OUT AD620 – INPUT R G TO POWER SUPPLY GROUND ...

Page 16 - OUTLINE DIMENSIONS

AD620 REV. E – 1 6 – OUTLINE DIMENSIONS Dimensions shown in inches and (mm). Plastic DIP (N-8) Package 8 1 4 5 0.430 (10.92) 0.348 (8.84) 0.280 (7.11)0.240 (6.10) PIN 1 SEATINGPLANE 0.022 (0.558) 0.014 (0.356) 0.060 (1.52) 0.015 (0.38) 0.210 (5.33) MAX 0.130(3.30)MIN 0.070 (1.77) 0.045 (1.15) 0.100 ...