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MCP6XXX Amplifier

Evaluation Board 2

User’s Guide

Summary of content (36 pages)

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Note the following details of the code protection feature on Microchip devices: • Microchip products meet the specification contained in their particular Microchip Data Sheet. • Microchip believes that its family of products is one of the most secure families of its kind on the market today, when used in the intended manner and under normal conditions. • There are dishonest and possibly illegal methods used to breach the code protection feature.
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MCP6XXX AMPLIFIER EVALUATION BOARD 2 USER’S GUIDE Table of Contents Preface ........................................................................................................................... 1 Introduction............................................................................................................ 1 Document Layout .................................................................................................. 1 Conventions Used in this Guide .......................................
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MCP6XXX AMPLIFIER EVALUATION BOARD 2 USER’S GUIDE Preface NOTICE TO CUSTOMERS All documentation becomes dated, and this manual is no exception. Microchip tools and documentation are constantly evolving to meet customer needs, so some actual dialogs and/or tool descriptions may differ from those in this document. Please refer to our web site (www.microchip.com) to obtain the latest documentation available. Documents are identified with a “DS” number.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide CONVENTIONS USED IN THIS GUIDE This manual uses the following documentation conventions: DOCUMENTATION CONVENTIONS Description Arial font: Italic characters Represents Referenced books Emphasized text A window A dialog A menu selection A field name in a window or dialog A menu path MPLAB® IDE User’s Guide ...is the only compiler...
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Preface RECOMMENDED READING This user's guide describes how to use MCP6XXX Amplifier Evaluation Board 2. Other useful documents are listed below. The following Microchip documents are available and recommended as supplemental reference resources. MCP6021/2/3/4 Data Sheet, “Rail-to-Rail Input/Output, 10 MHz Op Amps” (DS21685) This data sheet provides detailed information regarding the MCP602X product family. THE MICROCHIP WEB SITE Microchip provides online support via our web site at www.microchip.com.
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MCP6XXX AMPLIFIER EVALUATION BOARD 2 USER’S GUIDE Chapter 1. Product Overview 1.1 INTRODUCTION The MCP6XXX Amplifier Evaluation Board 2 is described by the following: • Assembly # : 114-00148 • Order # : MCP6XXXEV-AMP2 • Name: MCP6XXX Amplifier Evaluation Board 2 Items discussed in this chapter include: • Section 1.2 “MCP6XXX Amplifier Evaluation Board 2 Kit Contents” • Section 1.3 “Microchip’s Web-Based Mindi™ Analog Simulator Tool” • Section 1.4 “MCP6XXX Amplifier Evaluation Board 2 Description” 1.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide 1.3 MICROCHIP’S WEB-BASED MINDI™ ANALOG SIMULATOR TOOL The Mindi™ Analog Simulator tool is an innovative software tool that simplifies analog circuit design. The Mindi™ Analog Simulator tool supports the following application circuits: 1) Active Filters, 2) Amplifiers, 3) Battery Chargers, and 4) DC-to-DC Converters.
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MCP6XXX AMPLIFIER EVALUATION BOARD 2 USER’S GUIDE Chapter 2. Installation and Operation 2.1 INTRODUCTION This chapter shows how to set up the MCP6XXX Amplifier Evaluation Board 2. Items discussed in this chapter include: • Required Tools • MCP6XXX Amplifier Evaluation Board 2 Set-Up • MCP6XXX Amplifier Evaluation Board 2 Operation 2.2 REQUIRED TOOLS • Lab power supply • Lab signal source (e.g., function generator) • Lab measurement equipment (e.g., oscilloscope) 2.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide The power supply voltage needs to be in the allowed range for the installed op amps. Any of Microchip’s op amps that operate below 5.5V can be used. Moreover, the power supply is protected by a zener diode with nominal voltage 6.2V and bypassed by a 1.0 µF capacitor. (See Figure 2-3: “Power Supply Block.”) The mid-supply reference consists of a voltage divider and a buffer amplifier. (See Figure 2-4: “Mid-supply Reference Block.
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Installation and Operation 2.3.1 Top Level Amplifier Circuit Diagrams 2.3.1.1 POWER SUPPLY BLOCK The power supply is protected by a zener diode and bypassed by a capacitor. Figure 2-3 shows the circuit diagram for the power supply. CP1 = 1.0 µF. VS Power Supply VDD CP1 DP1 Note: FIGURE 2-3: 2.3.1.2 DP1 is a zener diode with nominal voltage of 6.2V. Power Supply Block. MID-SUPPLY REFERENCE BLOCK The mid-supply reference consists of a voltage divider and a buffer amplifier.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide 2.3.1.3 OUTPUT LOAD BLOCK The output load consists of a capacitor and two resistors. Figure 2-5 shows the circuit diagram for the output load. RISO is used to stabilize the amplifier when it drives a large capacitive load (CL). RISO is a short circuit (0Ω) when CL is small. VOUT Output Load RISO VL RL FIGURE 2-5: DS51668A-page 10 CL Output Load Block. © 2007 Microchip Technology Inc.
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Installation and Operation 2.3.1.4 INVERTING SUMMING AMPLIFIER • Amplifies two or more input voltages with an inverting gain. Input and output voltages are shifted by a reference voltage for single supply • The Mindi™ Amplifier Designer gives design recommendations for circuits with up to 8 inputs; see the circuit diagram shown in Figure 2-6.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide 2.3.1.5 NON-INVERTING SUMMING AMPLIFIER (NOT SUPPORTED) • Amplifies two or more voltages with a non-inverting gain.
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Installation and Operation 2.4 MCP6XXX AMPLIFIER EVALUATION BOARD 2 OPERATION Items discussed in this section include: • Building the Amplifier • Testing the Amplifier • Amplifier Modification: Using 8-Pin SOIC Op Amps 2.4.1 Building the Amplifier The accessory bag that comes with this kit makes it quick and easy to evaluate the amplifier described below, which was designed in the Mindi™ Amplifier Designer.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide Figure 2-11 shows the same circuit redrawn to emphasize the inverting summing amplifier. VS VDD Mid-supply Reference Power Supply CU1 VR VOUT R9 U1 R1 Output Load VL VIN-1 R2 VIN-2 R11 R3 VIN-3 FIGURE 2-11: Inverting Summing Amplifier Supported by the MCP6XXX Amplifier Evaluation Board 2 Kit.
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Installation and Operation Figure 2-12 is the fully assembled inverting summing amplifier’s circuit diagram. * Test Points VDD GND 0.1 µF * * R1 CU1 VIN-1 JP1 * R2 U1 A VIN-2 B * R11 VIN-3 * R4 R9 JP2 R10 RISO GND * R3 C VIN-4 * D VIN-5 * R5 CL VDD VL RL * R6 VIN-8 CR2 RR2 0.1 µF 20 kΩ UR1 GND * * R8 Power Supply VREF * VIN-7 0.1 µF CR1 * R7 RR1 20 kΩ * VIN-6 VDD CP1 DP1 1.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide 2.4.2 Testing the Amplifier 2.4.2.1 CHECKING THE TEST POINTS The (surface mount) test points for power supply, ground, input signal and output signal allow lab equipment to be connected to the board. Figure 2-14 shows the test points to check. Signal Inputs GND Test Point GND Test Point VL Test Point VREF Test Point FIGURE 2-14: DS51668A-page 16 GND Test Point VDD Test Point Checking the Test Points. © 2007 Microchip Technology Inc.
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Installation and Operation 2.4.2.2 TRANSIENT RESPONSES This inverting summing amplifier was built, and its responses were measured. A MCP6021 op amp, 1% resistors, and 5% capacitors were used. Notice how close the measured and simulated data are. 2.4.2.2.1 Transient Step Response In Bench Measurement: • Set VIN with a step amplitude of 1.4V and a center voltage of 2.5V. (i.e. VIN starts 0.7V below center and ends 0.7V above center) • The measured step response is shown in Figure 2-15.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide In the Mindi™ Amplifier Designer: • Set VIN with a step amplitude of 1.4V and a center voltage of 2.5V. (i.e. VIN starts 0.7V below center and ends 0.7V above center) • The output step response is shown in Figure 2-16. It is a signal with a step amplitude of 4.2V and a center voltage of 2.5V. (i.e. VOUT starts 2.1V above center and ends 2.1V below center) Note: The center voltage of VIN is set at VREF = VDD/2 (For VDD = 5.0V, VREF = 2.5V) VIN = 3.
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Installation and Operation 2.4.2.2.2 Transient Sine Wave Response In Bench Measurement: • Set VIN as a sine wave with a frequency of 100.0 Hz, a peak-to-peak voltage of 1.4V and a center voltage of 2.5V • The measured sine wave response is shown in Figure 2-17. It is a sine wave signal with a frequency of 100.0 Hz, a peak-to-peak voltage of 4.2V and a center voltage of 2.5V Note: The center voltage of VIN is set at VREF = VDD/2 (For VDD = 5.0V, VREF = 2.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide In the Mindi™ Amplifier Designer: • Set VIN as a sine wave with a frequency of 100.0 Hz, a peak-to-peak voltage of 1.4V and a center voltage of 2.5V • The simulated sine wave response is shown in Figure 2-18. It is a sine wave signal with a frequency of 100.0 Hz, a peak-to-peak voltage of 4.2V and a center voltage of 2.5V Note: The center voltage of VIN is set at VREF = VDD/2 (For VDD = 5.0V, VREF = 2.
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Installation and Operation 2.4.3 Amplifier Modifications Using 8-Pin SOIC Op Amps There are two options available to use single op amps in SOIC-8 packages (150 mil wide): • Soldering onto the MCP6XXX Amplifier Evaluation Board 2, or • Soldering it onto a separate board which is connected to the DIP-8 socket Note: The DIP-8 socket must be empty; only one op amp can be used at a time. Figure 2-19 shows a SOIC-8 op amp soldered onto the MCP6XXX Amplifier Evaluation Board 2.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide (Front View) DS51668A-page 22 (Back View) FIGURE 2-20: Op Amp in SOIC-8 package soldered to a separate board. FIGURE 2-21: Board 2. Connecting Adaptor Board onto MCP6XXX Amplifier Evaluation © 2007 Microchip Technology Inc.
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MCP6XXX AMPLIFIER EVALUATION BOARD 2 USER’S GUIDE Appendix A. Schematic and Layouts A.1 INTRODUCTION This appendix contains the following schematics and layouts for the MCP6XXX Amplifier Evaluation Board 2: • • • • Board – Schematic Board – Top Silk Layer Board – Top Metal Layer Board – Bottom Metal Layer © 2007 Microchip Technology Inc.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide BOARD - SCHEMATIC M A.2 1 3 DS51668A-page 24 © 2007 Microchip Technology Inc.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide A.4 BOARD - TOP METAL LAYER DS51668A-page 26 © 2007 Microchip Technology Inc.
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MCP6XXX AMPLIFIER EVALUATION BOARD 2 USER’S GUIDE Appendix B. Bill of Materials (BOM) B.1 MCP6XXX AMPLIFIER EVALUATION BOARD 2 BOM The Bill of Materials (BOM) in Table B-1 corresponds to Figure 2-1 and Figure 2-2. Unpopulated parts are in Table B-2. TABLE B-1: Qty BILL OF MATERIALS (102-00148R1) (NOTE 1) Reference Description Manufacturer Part Number 1 CP1 Capacitor Ceramic 1 µF 10% 25V X5R 0805 Panasonic® 4 CR1, CR2, CU1, CU2 Capacitor Ceramic 0.
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MCP6XXX Amplifier Evaluation Board 2 User’s Guide TABLE B-2: Qty BILL OF MATERIALS – UNPOPULATED PARTS (102-00148R1) Reference Description Manufacturer Part Number 1 U1 MCP6021, PDIP-8, Single Op Amp Microchip Technology Inc MCP6021-E/P 1 U2 MCP6021, SOIC-8, Single Op Amp Microchip Technology Inc MCP6021-E/SN 15 R1-R7, RISO, RL C1-C5, CL Not populated when shipped to customer — Note 1: — The components listed in this Bill of Materials are representative of the PCB assembly.
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