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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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TLE2072ACD датащи(PDF) 47 Page - Texas Instruments |
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TLE2072ACD датащи(HTML) 47 Page - Texas Instruments |
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47 / 81 page  TLE207x, TLE207xA EXCALIBUR LOW NOISE HIGHSPEED JFET INPUT OPERATIONAL AMPLIFIERS SLOS181B − FEBRUARY 1997 − REVISED APRIL 2004 47 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 PARAMETER MEASUREMENT INFORMATION − + − + 2 k Ω VCC + VCC + VO VO VCC − VCC − RS RS Ground Shield Picoammeters Figure 3. Noise-Voltage Test Circuit Figure 4. Input-Bias and Offset- Current Test Circuit − + VCC + VO VCC − IN − IN + Cic Cic Cid Figure 5. Internal Input Capacitance typical values Typical values presented in this data sheet represent the median (50% point) of device parametric performance. input bias and offset current At the picoampere bias current level typical of the TLE207x and TLE207xA, accurate measurement of the bias current becomes difficult. Not only does this measurement require a picoammeter but test socket leakages can easily exceed the actual device bias currents. To accurately measure these small currents, Texas Instruments uses a two-step process. The socket leakage is measured using picoammeters with bias voltages applied but with no device in the socket. The device is then inserted in the socket and a second test is performed that measures both the socket leakage and the device input bias current. The two measurements are then subtracted algebraically to determine the bias current of the device. |
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