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MCP6231 Datasheet(PDF) 11 Page - Microchip Technology |
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MCP6231 Datasheet(HTML) 11 Page - Microchip Technology |
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11 / 40 page  © 2009 Microchip Technology Inc. DS21881E-page 11 MCP6231/1R/1U/2/4 4.0 APPLICATION INFORMATION The MCP6231/1R/1U/2/4 family of op amps is manufactured using Microchip’s state-of-the-art CMOS process and is specifically designed for low-cost, low-power and general-purpose applications. The low supply voltage, low quiescent current and wide bandwidth makes the MCP6231/1R/1U/2/4 ideal for battery-powered applications. 4.1 Rail-to-Rail Inputs 4.1.1 PHASE REVERSAL The MCP6231/1R/1U/2/4 op amp is designed to prevent phase reversal when the input pins exceed the supply voltages. Figure 4-1 shows the input voltage exceeding the supply voltage without any phase reversal. FIGURE 4-1: The MCP6231/1R/1U/2/4 Show No Phase Reversal. 4.1.2 INPUT VOLTAGE AND CURRENT LIMITS The ESD protection on the inputs can be depicted as shown in Figure 4-2. 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 4-2: 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 4-3 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 4-3: 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. -1.0 0.0 1.0 2.0 3.0 4.0 5.0 6.0 Time (1 ms/div) VOUT VIN VDD = 5.0V G = +2 V/V Bond Pad Bond Pad Bond Pad VDD VIN+ VSS Input Stage Bond Pad VIN– V1 MCP623X R1 VDD D1 R1 > VSS – (minimum expected V1) 2mA R2 > VSS – (minimum expected V2) 2mA V2 R2 D2 R3 |
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