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4 Channel Input Buffer Board
Model SDAIBB
Document No. SDAIBB1300
This product designed and manufactured in Ottawa, Illinois USA
of domestic and imported parts by
International Headquarters
B&B Electronics Mfg. Co. Inc. USA
707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350
Phone (815) 433-5100 -- General Fax (815) 433-5105
Home Page: www.bb-elec.com
Sales e-mail:
sales@bb-elec.com
-- Fax (815) 433-5109
Technical Support e-mail:
support@bb.elec.com
-- Fax (815) 433-5104
1999 B&B Electronics
August 1999 B&B Electronics RESERVED. No part of this publication may be reproduced or transmitted in
any form or by any means, electronic or mechanical, including photography, recording, or any information
storage and retrieval system without written consent. Information in this manual is subject to change without
notice, and does not represent a commitment on the part of B&B Electronics.
B&B Electronics shall not be liable for incidental or consequential damages resulting from the furnishing,
performance, or use of this manual.
All brand names used in this manual are the registered trademarks of their respective owners. The use of
trademarks or other designations in this publication is for reference purposes only and does not constitute an
endorsement by the trademark holder.
SDAIBB1300 Manual
Cover Page
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104
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Related Manuals for B&B Electronics 4 Channel Input Buffer Board SDAIBB
Summary of Contents for B&B Electronics 4 Channel Input Buffer Board SDAIBB
- Page 1 4 Channel Input Buffer Board Model SDAIBB Document No. SDAIBB1300 This product designed and manufactured in Ottawa, Illinois USA of domestic and imported parts by International Headquarters B&B Electronics Mfg. Co. Inc. USA 707 Dayton Road -- P.O. Box 1040 -- Ottawa, IL 61350 Phone (815) 433-5100 -- General Fax (815) 433-5105 Home Page: www.bb-elec.com Sales e-mail:...
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Page 2: Table Of Contents
Table of Contents CHAPTER 1: GENERAL INFORMATION...1 ...1 NTRODUCTION ...1 PECIFICATIONS CHAPTER 2: CONNECTIONS ...3 OWER UPPLY ONNECTIONS NPUT OLTAGE ONNECTIONS UTPUT OLTAGE ONNECTIONS CHAPTER 3: CONFIGURATION ...9 ...9 UTPUT FFSET ...9 ELECTION Maximum Gain...11 Gain Resistor Determination ...12 Maximum and Minimum Common Mode Voltage...13 Maximum Differential ...14 Example Board Setup...15 APPENDIX A: GLOSSARY ...A-1... -
Page 3: Chapter 1: General Information
Chapter 1: General Information Introduction The SDAIBB is a data acquisition module with four input buffers with selectable gains and selectable output offsets. The gain can be set from 1 to 1000 with a single resistor change. Gains of 1 and 22.28 are provided. - Page 4 Power Supply Input Voltage Single Module Three Modules Input Current Current Draw From Precision 5 V 0.5 mA per board Max. Current Throughput Connections Analog Input Analog Output Power Environment Operating Temperature Storage Temperature Size B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 10 to 30 VDC 12 to 30 VDC 8 mA max.
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Page 5: Chapter 2: Connections
Chapter 2: Connections Power Supply Connections A single SDAIBB board requires 8 mA at 10 to 30 VDC, and can be brought directly into the board through terminal blocks or solder pads marked POWER and GND or passed from another board connected to the male side of the board. - Page 6 Figure 2: Single Power Supply System with 11 Channels Supported B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 I/O PORT J P 9 USER 22.28/ J P 1 0 J P 4 GAIN...
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Page 7: Input Voltage Connections
Input Voltage Connections The SDAIBB can receive signals in the range of –0.15 to +5 VDC when set to unity gain, and –0.15 to +3.5 VDC when set to any other gain. Note: This voltage reading is taken from GND on the SDAIBB to Input+ and GND to Input- voltages. -
Page 8: Output Voltage Connections
Figure 5: Floating Differential Signal Output Voltage Connections The SDAIBB outputs voltages from +0.1 to +5.0 VDC at unity gain, and +0.1 to +4.95 VDC at any other gain. All lines are carried straight through on the DB25 connectors, allowing for the addition of extra channels by connecting on another board. - Page 9 Table 1: Connections when the 4-position shunt is on JP9 Pin Connection Table 2: Connections when the 4-position shunt is on JP10 Pin Connection SDAIBB1300 Manual B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 Pin Connection Power A output...
- Page 10 Table 3: Connections when the 4-position shunt is on JP11 Pin Connection Table 4: Models Compatible with SDAIBB Channel Select Model Jumper Connections Supported 485SDA10 JP9, JP10, JP11 485SDA12 JP9, JP10, JP11 232SDA10 JP9, JP10, JP11 232SDA12 JP9, JP10, JP11 232SPDA 232SPDACL 485SPDA...
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Page 11: Chapter 3: Configuration
Chapter 3: Configuration Output Offset The output offset is the amount by which the output is shifted. Equation 1 shows how the output offset affects the output of the buffer. The negative output rail will clip any reading that has a negative input differential unless the buffer’s output offset is raised. - Page 12 Table 5: Values for Use with the Provided Gain of 22.28 VDIFF 27.5 mV max +55 mV ±52 mV 2.5 V ±110 mV Table 6: Gains and Resistor Values for Standard Inputs DIFF 5mV max +10 mV 0V 50mV max +100mV 0V 0.5V max +1 V 0V ±10 mV 2.5V...
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Page 13: Maximum Gain
Maximum Gain The maximum gain for a known differential voltage and common mode voltage can easily be determined using the following set of equations. Equation 5 calculates the maximum gain based on the positive internal rail of the amplifier. Equation 6 gives the maximum gain based on the negative internal rail of the amplifier. -
Page 14: Gain Resistor Determination
Gain Resistor Determination Replacing a single resistor changes the gain on each buffer. Change R1 to modify the gain on channel A, R2 to change channel B, R7 to change channel C, and R8 to change channel D. Use Equation 8 to determine the value of the gain resistor to attain a calculated gain. -
Page 15: Maximum And Minimum Common Mode Voltage
Maximum and Minimum Common Mode Voltage If the differential voltage range and desired gain are known, the maximum and minimum common mode voltage can be determined. Equation 10 is used to calculate the maximum common mode voltage knowing the gain and the differential voltage. Equation 11 is used to calculate the minimum common mode voltage. -
Page 16: Maximum Differential
Maximum Differential To determine the maximum differential voltage that can be amplified, the gain and the common mode voltage must be known first. Using this information, the most positive the differential voltage may be is calculated using Equation 12. Equation 13 is used to calculate the most negative that the differential voltage may swing. -
Page 17: Example Board Setup
Example Board Setup Figure 6 is an example of one possible configuration for the SDAIBB without modifying the board. Table 7 lists the setup for each channel. Table 7: Setup for Figure 6 Channel Output Pin Gain Output Offset SDAIBB1300 Manual B&B Electronics Mfg Co Inc –... - Page 18 JP10 JP11 22.28/USER GAIN OUT. OFF. 2.5V O U T G N D OUT. OFF. 2.5V O U T G N D GAIN 22.28/ U S E R B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax 815-433-5104 U S E R 22.28/ Figure 6...
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Page 19: Appendix A: Glossary
Appendix A: Glossary Common Mode Voltage voltage swings. When this is measured on the SDAIBB it is calculated with all voltage readings taken in reference to GND of the SDAIBB as . Note that when one of the inputs is connected to GND of the SDAIBB the common mode voltage changes as the differential voltage changes. -
Page 20: Appendix B: Error Budget Calculations
Appendix B: Error Budget Calculations Important Specs @ 25°C: offset in offset out I offset Gain Error Gain Nonlinearity 0.1Hz to 10Hz Noise Error Contributions that can be Removed With Calibration Equation 15: Equation 16: Equation 17: Equation 18: is the input voltage. Error Contributions that Cannot be Removed with Calibration Equation 19:... - Page 21 Example: Calculate the error budget for a 350 , 100mV load cell with a common mode voltage of 2.5V using a gain of 22.28. From Equation 15: From Equation 16: From Equation 17: From Equation 18: From Equation 19: From Equation 20: Total Unadjusted Error = 6109ppm Error After Calibration = 53ppm B&B Electronics Mfg Co Inc –...
- Page 22 FEDERAL COMMUNICATIONS COMMISSION RADIO FREQUENCY INTERFACE STATEMENT Class A Equipment This equipment has been tested and found to comply with the limits for Class A digital device, pursuant to Part 15 of the FCC Rules. These limits are designed to provide reasonable protection against harmful interference when the equipment is operated in a commercial environment.
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