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LM308AN Arkusz danych(PDF) 4 Page - Motorola, Inc |
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LM308AN Arkusz danych(HTML) 4 Page - Motorola, Inc |
4 / 8 page LM308A 4 MOTOROLA ANALOG IC DEVICE DATA SUGGESTED DESIGN APPLICATIONS INPUT GUARDING Special care must be taken in the assembly of printed circuit boards to take full advantage of the low input currents of the LM308A amplifier. Boards must be thoroughly cleaned with alcohol and blown dry with compressed air. After cleaning, the boards should be coated with epoxy or silicone rubber to prevent contamination. Figure 7. Fast (1) Summing Amplifier with Low Input Current (1) Power Bandwidth: 250 kHz Small Signal Bandwidth: 3.5 MHz Slew Rate: 10 V/ µs (2) C5 = 6 X 10–8 R1 (3) In addition to increasing speed, the LM101A raises high and low frequency gain, increases output drive capability and eliminates thermal feedback. RS C5 (2) Input R1 R4 150 pF 1 6 2 3 1.0 M Output LM101A (3) or equiv Compen B 1 M R2 LM308A 0.002 µF 0.002 µF 300 pF 150 k Even with properly cleaned and coated boards, leakage currents may cause trouble at +125 °C, particularly since the input pins are adjacent to pins that are at supply potentials. This leakage can be significantly reduced by using guarding to lower the voltage difference between the inputs and adjacent metal runs. The guard, which is a conductive ring surrounding the inputs, is connected to a low–impedance point that is at approximately the same voltage as the inputs. Leakage currents from high voltage pins are then absorbed by the guard. Figure 8. Sample and Hold (1) Teflon, Polyethylene or Polycarbonate Dielectric Capacitor Output 30 pF Q1 Q2 Input Sample VCC 1.0 M 1.0 µF (1) Figure 9. Connection of Input Guards Inverting Amplifier Follower Noninverting Amplifier (1) Used to compensate for large source resistances. Note: R1 R2 R1 +R2 must be an impedance. C1 R1 R2 Input Output R3 (1) C1 Input Output R3 (1) C1 R2 Input Output R1 R3 (1) |
Podobny numer części - LM308AN |
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Podobny opis - LM308AN |
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