MCP651EV-VOS Microchip Technology, MCP651EV-VOS Datasheet - Page 29

• Manufacturer Part Number: MCP651EV-VOS
• Description: BOARD EVAL OP AMP MCP651
• Manufacturer: Microchip Technology
• Series: mCal Technologyr

Specifications of MCP651EV-VOS

• Channels Per Ic: 1 - Single
• Amplifier Type: General Purpose
• Output Type: Single-Ended, Rail-to-Rail
• Slew Rate: 30 V/µs
• Current - Output / Channel: 100mA
• Operating Temperature: -40°C ~ 125°C
• Current - Supply (main Ic): 6mA
• Voltage - Supply, Single/dual (±): 2.5 V ~ 5.5 V
• Board Type: Fully Populated
• Utilized Ic / Part: MCP651
• Processor To Be Evaluated: MCP651
• Maximum Operating Temperature: + 125 C
• Minimum Operating Temperature: - 40 C
• Operating Supply Voltage: 2.5 V to 5.5 V
• Tool Type: Evaluation Board
• Core Architecture: PIC
• Cpu Core: PIC
• Data Bus Width: 8 bit
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

A.1
A.2
© 2009 Microchip Technology Inc.
INTRODUCTION
SCHEMATIC AND LAYOUTS
This appendix contains the schematics and layouts for the MCP651 Input Offset
Evaluation Board.
See A.3 “Board – Schematic” for the circuit diagram. U1 is the DUT (MCP651). U2
buffers the attenuated and filtered control voltage VCOX. U3 is the differential
integrator. U4 is the amplifier that gives the final gain to the DUT’s input offset voltage
(V
DUT. Switch S2 makes it so the amplifier (U4) can have two different gains, providing
a tradeoff between accuracy and range.
A.4 “Board – Combination of the Top Silk-Screen, Top Solder Mask and Top Metal
Layers” through A.7 “Board – Bottom Metal Layer” show the PCB layout plots. This
PCB has two metal layers: signal and power traces on top and ground plane on bottom.
Groups of critical resistors have been arranged so that their thermoelectric voltages
cancel (assuming constant temperature gradient); these groups are:
• R
• R
• R
• R
• R
The Gerber files for this board are available on the Microchip website
(www.microchip.com) and are contained in the zip file “00258R2_Gerbers.zip”.
Appendix A. Schematics and Layouts
OST
1
5
7
21
24
through R
and R
and R
). Switch S1 gives the user a means of starting an auto-calibration cycle in the
through R
and R
6
8
25
4
23
MCP651 INPUT OFFSET
EVALUATION BOARD
USER’S GUIDE
DS51834A-page 25