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ICL7650IJD Datasheet(PDF) 8 Page - Maxim Integrated Products |
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ICL7650IJD Datasheet(HTML) 8 Page - Maxim Integrated Products |
8 / 12 page Chopper-Stabilized Op Amps 8 _______________________________________________________________________________________ Input Guarding Low-leakage, high-impedance CMOS inputs allow the ICL7650/ICL7653 to measure high-impedance sources. Stray leakage paths can decrease input resistance and increase input currents unless inputs are guarded. Boards must be thoroughly cleaned with TCE or alcohol and blown dry with compressed air. The board should be coated with epoxy or silicone after cleaning to pre- vent contamination. Leakage currents may cause trouble even with properly cleaned and coated boards, particularly since the input pins are adjacent to pins that are at supply potentials. Leakage can be significantly reduced by using guard- ing to decrease the voltage difference between inputs and adjacent metal runs. Use a 10-lead pin circle, with the leads of the device formed so that the holes adja- cent to the inputs are empty when it is inserted in the board to accomplish input guarding of the 8-pin TO-99 package. A conductive ring surrounding the inputs, the “guard,” is connected to a low-impedance point that is approximately the same voltage as the inputs. The guard then absorbs the leakage current from the high- voltage pins. Typical guard connections are shown in Figure 3. OUTPUT INVERTING AMPLIFIER FOLLOWER INPUT R2 R1 R3* R3* OUTPUT INPUT USE R3 TO COMPENSATE FOR LARGE SOURCE RESISTANCES, OR FOR CLAMP OPERATION (FIGURE 5). * NONINVERTING AMPLIFIER R3* OUTPUT INPUT R2 R1 NOTE: SHOULD BE LOW IMPEDANCE FOR OPTIMUM GUARDING. R1 R2 R1 + R2 BOTTOM VIEW BOARD LAYOUT FOR INPUT GUARDING WITH TO-99 PACKAGE. 1 V+ V- GUARD OUTPUT EXTERNAL CAPACITORS EXTERNAL CAPACITORS 8 7 6 5 4 3 2 Figure 3. Input Guard Connection |
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