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MCP602-ISL Datasheet(PDF) 12 Page - Microchip Technology |
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MCP602-ISL Datasheet(HTML) 12 Page - Microchip Technology |
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12 / 20 page  MCP601/1R/2/3/4 DS21314G-page 12 © 2007 Microchip Technology Inc. 4.0 APPLICATIONS INFORMATION The MCP601/1R/2/3/4 family of op amps are fabricated on Microchip’s state-of-the-art CMOS process. They are unity-gain stable and suitable for a wide range of general purpose applications. 4.1 Inputs 4.1.1 PHASE REVERSAL The MCP601/1R/2/3/4 op amp is designed to prevent phase reversal when the input pins exceed the supply voltages. Figure 2-34 shows the input voltage exceeding the supply voltage without any phase reversal. 4.1.2 INPUT VOLTAGE AND CURRENT LIMITS The ESD protection on the inputs can be depicted as shown in Figure 4-1. This structure was chosen to protect the input transistors, and to minimize input bias current (IB). The input ESD diodes clamp the inputs when they try to go more than one diode drop below VSS. They also clamp any voltages that go too far above VDD; their breakdown voltage is high enough to allow normal operation, and low enough to bypass quick ESD events within the specified limits. FIGURE 4-1: Simplified Analog Input ESD Structures. In order to prevent damage and/or improper operation of these op amps, the circuit they are in must limit the currents and voltages at the VIN+ and VIN– pins (see Absolute Maximum Ratings † at the beginning of Section 1.0 “Electrical Characteristics”). Figure 4-2 shows the recommended approach to protecting these inputs. The internal ESD diodes prevent the input pins (VIN+ and VIN–) from going too far below ground, and the resistors R1 and R2 limit the possible current drawn out of the input pins. Diodes D1 and D2 prevent the input pins (VIN+ and VIN–) from going too far above VDD, and dump any currents onto VDD. When implemented as shown, resistors R1 and R2 also limit the current through D1 and D2. FIGURE 4-2: Protecting the Analog Inputs. It is also possible to connect the diodes to the left of resistors R1 and R2. In this case, current through the diodes D1 and D2 needs to be limited by some other mechanism. The resistors then serve as in-rush current limiters; the DC current into the input pins (VIN+ and VIN–) should be very small. A significant amount of current can flow out of the inputs when the common mode voltage (VCM) is below ground (VSS); see Figure 2-34. Applications that are high impedance may need to limit the useable voltage range. 4.1.3 NORMAL OPERATION The Common Mode Input Voltage Range (VCMR) includes ground in single-supply systems (VSS), but does not include VDD. This means that the amplifier input behaves linearly as long as the Common Mode Input Voltage (VCM) is kept within the specified VCMR limits (VSS–0.3V to VDD–1.2V at +25°C). Figure 4-3 shows a unity gain buffer. Since VOUT is the same voltage as the inverting input, VOUT must be kept below VDD–1.2V for correct operation. FIGURE 4-3: Unity Gain Buffer has a Limited VOUT Range. Bond Pad Bond Pad Bond Pad VDD VIN+ VSS Input Stage Bond Pad VIN– V1 MCP60X R1 VDD D1 R1 > VSS – (minimum expected V1) 2mA R2 > VSS – (minimum expected V2) 2mA V2 R2 D2 R3 MCP60X VOUT + – VIN |
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Similar Description - MCP602-ISL |
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