B&B Electronics 4 Channel Input Buffer Board SDAIBB User manual

SDAIBB1300 Manual Cover Page
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
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 [phone] -- General Fax [phone]
Home Page: www.bb-elec.com
Sales e-mail: [e-mail] -- Fax [phone]
Technical Support e-mail: s[email protected]ec.com -- Fax [phone]
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 Table of Contents i
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
Table of Contents
CHAPTER 1: GENERAL INFORMATION...........................................1
INTRODUCTION .........................................................................................1
SPECIFICATIONS ........................................................................................1
CHAPTER 2: CONNECTIONS...............................................................3
POWER SUPPLY CONNECTIONS .................................................................3
INPUT VOLTAGE CONNECTIONS ................................................................5
OUTPUT VOLTAGE CONNECTIONS.............................................................6
CHAPTER 3: CONFIGURATION..........................................................9
OUTPUT OFFSET........................................................................................9
GAIN SELECTION.......................................................................................9
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
APPENDIX B: ERROR BUDGET CALCULATIONS......................B-1
IMPORTANT SPECS @ 25°C: .................................................................B-1
ERROR CONTRIBUTIONS THAT CAN BE REMOVED WITH CALIBRATION.B-1
ERROR CONTRIBUTIONS THAT CANNOT BE REMOVED W/CALIBRATIONB-1

SDAIBB1300 Manual 1
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
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. The output can be offset by the provided 0 V for positive ended
systems, by the provided 2.5 V for plus/minus applications, or by a user
selected amount that is brought in on terminal blocks or solder pads. The
SDAIBB is designed to amplify single ended or differential signals in the
range of –0.15 to +5.0 V into +0.01 to +5.0 V signals that are compatible
with the B&B line of data acquisition products. Sensor and power supply
connections are made through terminal blocks or solder pads. A/D
connections are made through DB25 connectors and are designed to
connect to many of the B&B data acquisition products. All lines on the
DB25 connectors are carried through, allowing boards to be “stacked” for
expanding the number of channels or bringing other lines in or out. Three
SDAIBB boards will fill all 11 channels of the 232SDAxx or 485SDAxx
modules.
Specifications
Number of Channels 4
Gain 1 to 1000
1 and 22.28 provided
Max. Gain Error 0.35%
Max. Gain Drift 25 ppm
Max. Input Offset Voltage 200 µV
Max. Input Offset Voltage Drift 2 µV/°C
Input Impedance 2 GΩ, 2pF
Input Voltage Range
Gain = 1 -0.15 to +5.00 V
Gain > 1 -0.15 to +4.60 V
Output Voltage Range
Gain = 1 0.01 to 5.00 V
Gain > 1 0.01 to 4.95 V

2 SDAIBB1300 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
Power Supply
Input Voltage
Single Module 10 to 30 VDC
Three Modules 12 to 30 VDC
Input Current 8 mA max. per Module
Current Draw From Precision 5 V 0.5 mA per board
Max. Current Throughput 1 A
Connections
Analog Input Terminal Blocks/Solder Pads
Analog Output DB25 Male Connector and
DB25 Female Connector
Power Terminal Blocks/Solder Pads
Pins 2 and 7 of the Male
DB25
Environment
Operating Temperature -40 to +85 °C
Storage Temperature -65 to +125 °C
Size 5.6 x 2.75 in.
14x7cm

SDAIBB1300 Manual 3
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
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. See Figure 1 for a system where the power is
brought directly onto the board. When passing power through from
another board, POWER is carried through on pin 2 and GND is carried
through on pin 7. Powers flows in on the male DB25 connector and out on
the female DB25 connector with a 0.5 VDC drop across the board. This
allows multiple boards to be powered with a single power supply by
cascading them. See Table 4 for a list of B&B data acquisition products
that carry power through on pins 2 and 7. Using these devices, you can
power an entire system with a single power supply as shown in Figure 2.
GAIN
JP4
Port Powered
RS-232
MODULE
I/O PORT
O tta w a , Illin o is 6 1 35 0
DATA ACQUISITION
MODEL 232SDA10
JP9
JP10
R8
1
22.28/
USER
JP3
OUT
OFF
GND
IN+
IN-
OUT.
OFF.
2.5V
0V
POWER
GND
OUT
OFF
GND
IN+
IN-
OUT.
OFF.
2.5V
0V
OUT
OFF
GND
IN+
IN-
22.28/U S E R
1
GAIN
JP11
OUT.
OFF.
2.5V
0V
JP2
JP6
R2
TB2 TB4
TB5
JP8
OUT
OFF
GND
IN+
IN-
OUT.
OFF.
2.5V
0V
JP5
A
B
TB1
C D
TB3
JP7
Power Supply
GAIN
22.28/
USER
1
GAIN 1
22.28/
USER
R1
JP1
R7
Figure 1: Port Powered SDA and Powered Board

4 SDAIBB1300 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
JP2
Board 2
JP9
JP10
22.28/USER
1
JP11
GAIN
JP4
R8
1
JP8
22.28/
USER
OUT.
OFF.
2.5V
0V
TB1
OUT
OFF
GND
IN+
IN-
OUT
OFF
GND
IN+
IN-
GAIN
JP6
R2
TB2
JP5
A
B
OUT
OFF
GND
IN+
IN-
OUT.
OFF.
2.5V
0V
OUT.
OFF.
2.5V
0V
TB4
TB5
C
D
TB3
JP7
OUT
OFF
GND
IN+
IN-
POWER
GND
OUT.
OFF.
2.5V
0V
R1
JP1
GAIN 1
22.28/
USER
JP3
R7
GAIN
22.28/
USER
1
JP2
Board 1
JP9
JP10
22.28/USER
1
JP11
GAIN
JP4
R8
1
JP8
22.28/
USER
OUT.
OFF.
2.5V
0V
TB1
OUT
OFF
GND
IN+
IN-
OUT
OFF
GND
IN+
IN-
GAIN
JP6
R2
TB2
JP5
A
B
OUT
OFF
GND
IN+
IN-
OUT.
OFF.
2.5V
0V
OUT.
OFF.
2.5V
0V
TB4
TB5
C
D
TB3
JP7
OUT
OFF
GND
IN+
IN-
POWER
GND
OUT.
OFF.
2.5V
0V
R1
JP1
GAIN 1
22.28/
USER
JP3
R7
GAIN
22.28/
USER
1
Power
Ottawa,Illinois61350
MODULE
DATAACQUISITION
MODEL 232SDA10
RS-232
I/O PORT
JP2
JP9
JP10
22.28/USER
1
JP11
GAIN
JP4
R8
1
JP8
22.28/
USER
OUT.
OFF.
2.5V
0V
TB1
OUT
OFF
GND
IN+
IN-
OUT
OFF
GND
IN+
IN-
GAIN
JP6
R2
TB2
JP5
A
B
OUT
OFF
GND
IN+
IN-
OUT.
OFF.
2.5V
0V
OUT.
OFF.
2.5V
0V
TB4
TB5
C
D
TB3
JP7
OUT
OFF
GND
IN+
IN-
POWER
GND
OUT.
OFF.
2.5V
0V
R1
JP1
GAIN 1
22.28/
USER
JP3
R7
GAIN
22.28/
USER
1
Board 3
Figure 2: Single Power Supply System with 11 Channels Supported

SDAIBB1300 Manual 5
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
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. It is not the differential voltage
from Input- to Input+. Signals are brought into the buffer by terminal
blocks or solder pads. The terminal blocks are labeled Input+, Input-,
GND, and Output Offset. See Figures 3, 4, and 5 for typical input
configurations. The voltage that will be amplified is the reading taken from
Input- to Input+. GND is connected to the ground of the SDAIBB and is
provided for making a common reference for the SDAIBB and the input
device. The Output Offset is an input that shifts the output of the SDAIBB.
This feature is discussed further in Chapter 3, Output Offset.
OUT
OFF
GND
IN+
IN-
Figure 3: Differential Signal with GND
OUT
OFF
GND
IN+
IN-
Signal
GND
Figure 4: Single Ended Signal

6 SDAIBB1300 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
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.
The SDAIBB output connections are jumper selectable to line up
with the channels of the B&B line of SDAxx data acquisition devices.
When the 4-position shunt is set to JP9, input buffer A is connected to
channel 0 on pin 8, B is connected to channel 1 on pin 9, C is connected to
channel 2 on pin 10, and buffer D is connected to channel 3 on pin 11.
Setting the 4-position shunt to JP10 connects the buffers to channels 4 to 7
(pins 12, 13, 21, and 22 respectively), and setting the shunt to JP11
connects the buffers to channels 8 to 10 (pins 23 to 25). See Table 1 for a
list of the connections when the jumper is on JP9,
Table 2 for when the jumper is on JP10, and Table 3 for when the
jumper is on JP11. Note: When the 4-position jumper is on JP11,
buffer D is not connected to any pins on the DB25 connector.
For a listing of which modules the SDAIBB can connect to and
which channels are compatible on each module, see Table 4.
OUT
OFF
GND
IN+
IN-
Figure 5: Floating Differential Signal

SDAIBB1300 Manual 7
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
Table 1: Connections when the 4-position shunt is on JP9
Pin Connection Pin Connection
1---14---
2 Power 15 ---
3---16---
4---17---
5---18---
6---19---
7GND20 ---
8 A output 21 ---
9 B output 22 ---
10 C output 23 ---
11 D output 24 ---
12 --- 25 ---
13 ---
Table 2: Connections when the 4-position shunt is on JP10
Pin Connection Pin Connection
1 --- 14 ---
2 Power 15 ---
3 --- 16 ---
4 --- 17 ---
5 --- 18 ---
6 --- 19 ---
7GND20 ---
8 --- 21 C output
9 --- 22 D output
10 --- 23 ---
11 --- 24 ---
12 A output 25 ---
13 B output

8 SDAIBB1300 Manual
B&B Electronics Mfg Co Inc – 707 Dayton Rd - PO Box 1040 - Ottawa IL 61350 - Ph 815-433-5100 - Fax [phone]
To support all 11 channels on the SDAxx modules connect 3
SDAIBBs to the I/O port of the SDAxx as shown in Figure 2 on page 4 and
set one board to JP9, one to JP10, and the last to JP11. This will provide
11 independent buffered inputs.
Table 3: Connections when the 4-position shunt is on JP11
Pin Connection Pin Connection
1 --- 14 ---
2 Power 15 ---
3 --- 16 ---
4 --- 17 ---
5 --- 18 ---
6 --- 19 ---
7GND20 ---
8 --- 21 ---
9 --- 22 ---
10 --- 23 A output
11 --- 24 B output
12 --- 25 C output
13 ---
Table 4: Models Compatible with SDAIBB
Model Channel Select Jumper Connections
Supported
Channels
Supported
Power on
pins 2
and 7
2.5V
Output
Offset
Available
485SDA10 JP9
,
JP10
,
JP11 0-10 Yes Yes
485SDA12 JP9
,
JP10
,
JP11 0-10 Yes Yes
232SDA10 JP9
,
JP10
,
JP11 0-10 Yes Yes
232SDA12 JP9
,
JP10
,
JP11 0-10 Yes Yes
232SPDA JP9 0-3 Yes Yes
232SPDACL JP9 0-3 Yes Yes
485SPDA JP9 0-3 Yes Yes
485SPDACL JP9 0-3 Yes Yes
232OPSDA * 4 and 5 No No
ADIO12 JP9 4-7 No No
ADIO10 JP9 4-7 No No
Set the jumper for any position and use the solder pads on the DB25
connector to bring out connections for channels 4 and 5. The other
channels already have selectable gains.