Maximum And Minimum Common Mode Voltage - B&B Electronics 4 Channel Input Buffer Board SDAIBB Product Manual

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. Remember that when
Input+ or Input- is connected to GND on the SDAIBB the
common mode voltage changes as the differential voltage changes.
Equation 10:
Equation 11:
Example: Find the allowable range of the common mode voltage for a
input range of ±100 mV with a gain of 10.
From Equation 10:
From Equation 11:
The common mode voltage must be between –0.09 and 3.9 V.
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
V 4 4 . V
CMMAX
V . 0 590 V
CMMIN
0
V 4 4 .
CMMAX
V . 0 590
CMMIN
V G
DIFF
2
V G
DIFF
2
1 . 10
3 9 . V
2
0 1 . 10
. 0 09
2
V
13