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OP77NBC Datasheet(PDF) 10 Page - Analog Devices |
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OP77NBC Datasheet(HTML) 10 Page - Analog Devices |
10 / 16 page OP77 Rev. E | Page 10 of 16 TEST CIRCUITS OP77 200k Ω VO 50 Ω VOS = VO 4000 Figure 21. Typical Offset Voltage Test Circuit INPUT REFERRED NOISE = VO 25,000 OP77 2.5M Ω V+ V– OUTPUT 100 Ω 100 Ω 3.3k Ω 4.7µF ( ≈10Hz FILTER) 7 6 4 2 3 Figure 22. Typical Low-Frequency Noise Test Circuit OP77 V+ OUTPUT V– 20k Ω INPUT + – 1 8 7 6 4 2 3 Figure 23. Optional Offset Nulling Circuit OP77 100k Ω +18V –18V 7 6 4 2 3 + 10µF + 10µF 0.1µF 0.1µF * * 10 Ω 10 Ω 10k Ω 10k Ω NOTES *1 PER BOARD Figure 24. Burn-In Circuit 1M Ω RL VX 10 Ω 10k Ω 100k Ω VIN = ±10V TYPICALPRECISION OP AMP VY VX –10V 0V +10V NOTES 1. GAIN NOT CONSISTANT. CAUSES NONLINEAR ERRORS. 2.AVO SPEC IS ONLY PART OF THE SOLUTION. 3. CHECK SPECIFICATION TABLE 1 AND TABLE 2 FOR PERFORMANCE. AVO 650V/mV RL = 2kΩ Figure 25. Open-Loop Gain Linearity Actual open-loop voltage gain can vary greatly at various output voltages. All automated testers use endpoint testing and therefore only show the average gain. This causes errors in high closed- loop gain circuits. Because this is difficult for manufacturers to test, users should make their own evaluations. This simple test circuit makes it easy. An ideal op amp would show a horizontal scope trace. VY VX –10V 0V +10V Figure 26. Output Gain Linearity Trace This is the output gain linearity trace for the new OP77. The output trace is virtually horizontal at all points, assuring extremely high gain accuracy. The average open-loop gain is truly impressive—approximately 10,000,000. |
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