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MCP6001-E/MS датащи(PDF) 11 Page - Microchip Technology |
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MCP6001-E/MS датащи(HTML) 11 Page - Microchip Technology |
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11 / 28 page ![]() © 2005 Microchip Technology Inc. DS21733F-page 11 MCP6001/2/4 This voltage rate of change is less than the MCP6001/2/4 slew rate of 0.6 V/µs. When the input voltage swings below the voltage across C1, D1 becomes reverse- biased. This opens the feedback loop and rails the amplifier. When the input voltage increases, the amplifier recovers at its slew rate. Based on the rate of voltage change shown in the above equation, it takes an extended period of time to charge a 0.1 µF capacitor. The capacitors need to be selected so that the circuit is not limited by the amplifier slew rate. Therefore, the capaci- tors should be less than 40 µF and a stabilizing resistor (RISO) needs to be properly selected. (Refer to Section 4.3 “Capacitive Loads”). FIGURE 4-8: Peak Detector with Clear and Sample CMOS Analog Switches. VIN MCP6002 VC1 MCP6002 D1 Op Amp A Op Amp B VOUT MCP6001 Op Amp C C2 Sample Signal Clear Signal Clear RISO Sample – + – + – + CLK tSAMP tCLEAR tDETECT Switch Switch 1/2 1/2 R1 RISO VC2 C1 |
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