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INTRODUCTION
This chapter contains general information that will be useful to know before using the
MCP6XXX Amplifier Evaluation Board 1. Items discussed in this chapter include:
• Document Layout
• Conventions Used in this Guide
• Recommended Reading
• The Microchip Web Site
• Customer Support
• Document Revision History
DOCUMENT LAYOUT
This document describes how to use the MCP6XXX Amplifier Evaluation Board 1. The
manual layout is as follows:
• Chapter 1. “Product Overview” - Provides all important information about the
MCP6XXX Amplifier Evaluation Board 1.
• Chapter 2. “Installation and Operation” – Covers the installation and operatio n
of the MCP6XXX Amplifier Evaluation Board 1. It lists the required tools, shows
how to set up the board, and demonstrates how to verify the operation.
• Appendix A. “Schematic and Layouts” – Shows the schematic and board
layouts for the MCP6XXX Amplifier Evaluation Board 1.
• Appendix B. “Bill Of Materials (BOM)” – Lists the parts used to build the
MCP6XXX Amplifier Evaluation Board 1.
This user's guide describes how to use MCP6XXX Amplifier Evaluation Board 1. Other
useful documents are listed below. The following Microchip documents are available
and recommended as supplemental reference resources.
MCP6021 Data Sheet “Rail-to-Rail Input/Output, 10 MHz Op Amps“ (DS21685)
This data sheet provides detailed information regarding the MCP6021 product family.
THE MICROCHIP WEB SITE
Microchip provides online support via our web site at www.microchip.com. This web
site is used as a means to make files and information easily available to customers.
Accessible by using your favorite Internet browser , the web site contains the following
information:
• Product Support – Data sheets and errata, application notes and sample
programs, design resources, user’s guides and hardware support documents,
latest software releases and archived software
• General Technical Support – Frequently Asked Questions (FAQs), technical
support requests, online discussion groups, Microchip consultant program
member listing
• Business of Microchip – Product selector and ordering guides, latest Microchip
press releases, listing of seminars and events, listings of Microchip sales offices,
distributors and factory representatives
Preface
CUSTOMER SUPPORT
Users of Microchip products can receive assistance through several channels:
• Distributor or Representative
• Local Sales Office
• Field Application Engineer (FAE)
• Technical Support
• Development Systems Information Line
Customers should contact their distributor, representative or field application engineer
for support. Local sales offices are also available to help customers. A listing of sales
offices and locations is included in the back of this document.
Technical support is available through the web site at: http://support.microchip.com.
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. The Mindi™ Amplifier Designer provides full schematic diagrams of the
amplifier application circuit with recommended component values and displays the
responses in frequency and time domains.
The Mindi™ Analog Simulator tool is a free web-based design tool available on the
Microchip web site at http://www.microchip.com un der “Online Simulat i on Tools” or
by going directly to the Mindi™ web site at http://www.microchip.com/mindi.
The circuit simulator within the Mindi™ Analog Simulator tool can be downloaded and
installed on a personal computer (PC) for more convenient simulations. Modified circuit
files can also be downloaded to the PC.
The MCP6XXX Amplifier Evaluation Board 1 is designed to support
inverting/non-inverting amplifiers, voltage follower, inverting/non-inverting comparators, inverting/non-inverting differentiators.
However, at this time, the Mindi™ Amplifier Designer does not support the non-inverting comparator or the non-inverting differentiator.
MCP6XXX Amplifier Evaluation Board 1 has the following features:
• All amplifier resistors and capacitors are socketed
• All of the component labels on board keep consistent with those on schematic
generated in the Mindi™ Amplifier Designer
• Supports all Microchip single op amps
- PDIP-8 package (e.g., MCP6021) are socketed
- SOIC-8 package can be accommodated; see Section 2.4.3 “Amplifier
Modification: Using 8-Pin SOIC Op Amps”
• Test points for connecting lab equipment
• Single supply configuration
Figure 1-2 shows the block diagram of the MCP6XXX Amplifier Evaluation Board 1.
Lab equipment can be attached (via test points) to measure the amplifier response.
This chapter shows how to set up the MCP6XXX Amplifier Evaluation Board 1 and
verify its operation. This chapter includes the following topics:
• Required Tools
• MCP6XXX Amplifier Evaluation Board 1 Set-Up
• MCP6XXX Amplifier Evaluation Board 1 Operation
2.2REQUIRED TOOLS
• Lab power supply
• Lab signal source (e.g., function generator)
• Lab measurement equipment (e.g., oscilloscope)
2.3MCP6XXX AMPLIFIER EVALUATION BOARD 1 SET-UP
The MCP6XXX Amplifier Evaluation Board 1 is designed to support
inverting/non-inverting amplifiers, voltage follower, inverting/non-inverting
comparators, inverting/non-inverting differentiators
At this time, the Mindi™ Amplifier Designer does not support the non-inverting
comparator or the non-inverting differentiator.
This section details the conversion of these topologies to the MCP6XXX Amplifier
Evaluation Board 1. Figure 2-1 shows the circuit diagram for the board.
The power supply voltage should be in the allowed range for the installed op amps. Any
of Microchip’s op amps that operate below 5.5V can be used. Mor eover, 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.”)
The resistors and capacitors that are part of an amplifier are placed in pin sockets
which are labeled. All of the component labels on board keep consistent with those on
schematic generated in the Mindi™ Amplifier Designer. The op amps are bypassed by
0.1 µF capacitors and the single op amp U1 can have either a PDIP-8 or SOIC-8
package.
• PDIP-8 packages are inserted into the DIP-8 socket to the right of the U1 label
• SOIC-8 packages can be accommodated; see Section 2.4.3 “Amplifier
Modification: Using 8-Pin SOIC Op Amps”
The (surface mount) test points for power supply , ground, input signal a nd output signal
allow lab equipment to be connected to the board. The MCP6XXX Amplifier Evaluation
Board 1 top view is shown in Figure 2-2.
FIGURE 2-2:MCP6XXX Amplifier Evaluation Board 1 Top View.
FIGURE 2-11:Voltage Amplifier Example Supported by the MCP6XXX Amplifier
Evaluation Board 1.
MCP6XXX Amplifier Evaluation Board 1 User’s Guide
Output
Load
V
S
Power
Supply
Mid-supply
Reference
V
L
C
5
V
DD
C
U1
U
1
V
R
V
IN
R
1
R
5
R
6
V
OUT
RR1
20 kΩ
C4
VL
RR2
20 kΩ
GND
DP1
CP1
1.0 µF
R5
R1
R6
UR1
VDD
U1
VDD
0.1 µF
CU1
CR1
0.1 µF
JP1
A
B
C
D
R3
C3
RISO
Power Supply
GND
VREF
VDD
VIN
RLR7CLC5
C1
R2
C2
R4
JP2
CR2
0.1 µF
* Test P oints
*
*
**
*
*
2.3.1.7INVERTING COMPARATOR
• Compares the input voltage to another (refe rence) voltage and forces the output
to one of two digital states. Input signal is applied to the inverting input. The
comparison includes a user selected amount of hysteresis. Input and output
voltages are shifted by a reference for single supply
• The Mindi™ Amplifier Designer gives design recommendations for the inverting
comparator circuit; see the circuit diagram shown in Fig ur e 2-12
- Fill the sockets with the recommended resistors and capacitors
- Set JP1 and JP2 in the correct positions
(for the given example, JP1: Position B, JP2: Position C)
Note: The MCP6XXX Amplifier Evaluation Board 1 currently only supports the inverting
comparator with center trip point = 2.5V.
FIGURE 2-12:Inverting Comparator Circuit Diagram.
Figure 2-13 shows an example of the inverting comparator circuit diagram supported
by MCP6XXX Amplifier Evaluation Board 1.
FIGURE 2-13:Inverting Comparator Example Supported by the MCP6XXX
Amplifier Evaluation Board 1.
2.3.1.8NON-INVERTING COMPARATOR (NOT CURRENTLY SUPPORTED)
• Compares the input voltage to another (reference) voltage and forces the output
to one of two digital states. Input signal is applied to the non-inverting input. The
comparison includes a user selected amount of hysteresis. Input and output voltages are shifted by a reference for single supply
• The Mindi™ Amplifier Designer gives design recommendations for the non-inverting comparator circuit; see the circuit diagram shown in Figure 2-14
- Fill the sockets with the recommended resistors and capacitors
- Set JP1 and JP2 in the correct positions
(for the given example, JP1: Position A, JP2: Position D)
Note: The MCP6XXX Amplifier Evaluation Board 1 currently only supports the
non-inverting comparator with center trip point = 2.5V.
2.3.1.10NON-INVERTING DIFFERENTIATOR (NOT CURRENTLY SUPPORTED)
• Differentiates and inverts a voltage with a differentiating frequency. Additional
components(R
are shifted by a reference for single supply
• The Mindi™ Amplifier Designer gives design recommendations for the non-inverting differentiator circuit; see the circuit diagram shown in Figure 2-18
- Fill the sockets with the recommended resistors and capacitors
- Set JP1 and JP2 in the correct positions
(for the given example, JP1: Position A, JP2: Position C)
Note: The MCP6XXX Amplifier Evaluation Board 1 currently only supports the
non-inverting differentiator with center trip point = 2.5V.
, C3) achieve stabilization and noise. Input and output voltages
FIGURE 2-19:Non-Inverting Differentiator Example Supported by the
MCP6XXX Amplifier Evaluation Board 1.
MCP6XXX Amplifier Evaluation Board 1 User’s Guide
2.4MCP6XXX AMPLIFIER EVALUATION BOARD 1 OPERATION
Items discussed in this section include:
• Building the Amplifier
• Testing the Amplifier
• Amplifier Modification: Using 8-Pin SOIC Op Amps
2.4.1Building the Amplifier
The accessory bag that comes with this kit makes it quick and easy to evaluate the
amplifier described below; it was designed in Mindi™ Amplifier Designer.
Figure 2-21 shows the same circuit redrawn to emphasize the non-inverting amplifier.
FIGURE 2-21:Non-Inverting Amplifier Circuit Diagram Supported by the
MCP6XXX Amplifier Evaluation Board 1 Kit.
Each of the components in Figure 2-21 that needs to be inserted in a socket on the
MCP6XXX Amplifier Evaluation Board 1 is listed in Table 2-1 and Table 2-2.
2.4.2.2TRANSIENT RESPONSES
This non-inverting 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.
2.4.2.2.1Step Response
In Bench Measurement:
•Set V
1.0V below center and ends 1.0V above center.
• The measured step response is shown in Figure 2-25. It is a signal with a step
amplitude of 4.0V and an center voltage of 2.5V. (i.e. V
center and ends 2.0V above center.
with a step amplitude of 2.0V and a center voltage of 2.5V. (i.e. VIN starts
• The measured sine wave response is shown in Figure 2-27. It is a sine wave
signal with a frequency of 100.0 Hz, a peak-to-peak voltage of 4.0V and a center
voltage of 2.5V
as a sine wave with a frequency of 100.0 Hz, a peak-to-peak voltage of
• The simulated sine wave response is shown in Figure 2-28. It is a sine wave
signal with a frequency of 100.0 Hz, a peak-to-peak voltage of 4.0V and a center
voltage of 2.5V
as a sine wave with a frequency of 100.0 Hz, a peak-to-peak voltage of
2.4.3Amplifier Modification: Using 8-Pin SOIC Op Amps
There are two options available when using single op amps in SOIC-8 packages
(150 mil wide):
• Soldering onto the MCP6XXX Amplifier Evaluation Board 1,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 2-29 shows a SOIC-8 op amp soldered onto the MCP6XXX Amplifier Evaluation
Board 1.
FIGURE 2-29:Op Amp in SOIC-8 package soldered onto the MCP6XXX
Amplifier Evaluation Board 1.
Figure 2-30 shows a SOIC-8 op amp and a DIP-8 socket, soldered onto the 8-Pin
SOIC/MSOP/TSSOP/DIP Evaluation Board available from Microchip Technology Inc
(order # SOIC8EV). The two interconnect strips on the bottom are Samtec part #
BBS-14-T-B or equivalent and are soldered into the through holes for the DIP-8 socket.
Figure 2-31 shows the SOIC8EV board plugged into the MCP6XXX Amplifier
Evaluation Board 1.
Note:Insert the interconnect strips into the DIP-8 socket on the MCP6XXX
Amplifier Evaluation Board 1. Place the SOIC8EV board on the top of the
interconnect strips with the same pin orientation. Now solder the strips to
the top board; this procedure ensures correct alignment of the strips. Clip
the pins flush with the top surface of the SOIC8EV board, then solder the
SOIC-8 op amp on the top.
TABLE B-2:BILL OF MATERIALS – UNPOPULATED PARTS (102-00147R1)
Qty
ReferenceDescriptionManufacturerPart Number
1U1MCP6021 PDIP-8, Single Op
Amp
1U2MCP6021 SOIC-8, Single Op
Amp
15R1-R7, RISO, RL
C1-C5, CL
Note 1:The components listed in this Bill of Materials are representative of the PCB assembly . The released BOM
used in manufacturing uses all RoHS-compliant components.
Not Populated when shipped to
customer
Microchip
Technology Inc.
Microchip
Technology Inc.
——
MCP6021-E/P
MCP6021-E/SN
The BOM in Table B-3 corresponds to the collection of resistors, capacitorys, jumpers
and MCP6021 op amps that come in the Accessory Bag which is shipped in the
MCP6XXX Amplifier Evaluation Board 1 Kit. These components are placed in an
separate ESD bag. They support the circuit in Secti on 2.4.1 “Building the Amplifier”.
Customers need to provide the resistors and capacitors for more amplifier circuits.
TABLE B-3:BILL OF MATERIALS – ACCESSORY BAG PARTS (102-00147R1)
Qty
1Accessory BagCAP CER 56PF 50V C0G
1Accessory BagJUMPER ZERO OHM 1/8WYageo CorporationZOR-12-B-52
1Accessory BagRES 976 OHM 1/4W 1% METAL
1Accessory BagRES 3.92K OHM 1/4W 1%
2Accessory BagRES 1.96K OHM 1/4W 1%
1ESD Sample Box MCP6021 Single Op Amp
Note 1: The components listed in this Bill of Materials are representative of the PCB assembly. The released BOM
ReferenceDescriptionManufacturerPart Number
Murata ElectronicsRPE5C1H560J2P1Z03B
RADIAL
Yageo CorporationMFR-25FBF-976R
FILM
Yageo CorporationMFR-25FBF-3K92
METAL FILM
Yageo CorporationMFR-25FBF-1K96
METAL FILM
Microchip Technology Inc. MCP6021-E/P
PDIP-8
used in manufacturing uses all RoHS-compliant components.