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LT1463 Datasheet(PDF) 7 Page - Linear Technology |
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LT1463 Datasheet(HTML) 7 Page - Linear Technology |
7 / 12 page 7 LT1462/LT1463 APPLICATIONS INFORMATION Phase Reversal Protection Most industry standard JFET input single, dual and quad op amps exhibit phase reversal at the output when the negative common mode limit at the input is exceeded. Common mode range is at a premium at ±5Vsupplies.The Figures show a ±5.2V sine wave input (Figure 1a), the (1a) ±5.2V Sine Wave LT1462 • F01a LT1462 • F01b Figure 1. Voltage Follower with Input Exceeding the Common Mode Range (VS = ±5V) LT1462 • F01c (1b) Typical JFET Input Op Amp with ±5V Supplies (1c) LT1462/LT1463 Output with ±5V Supplies response of a competing JFET input op amp in the unity- gain follower mode (Figure 1b) and the response of the LT1462/LT1463 (Figure 1c). The phase reversal of Figure 1b can cause lock-up in servo systems.TheLT1462/LT1463doesnotphase-reversewhen the common mode input is anywhere within the supplies. |
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