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university:tools:m1k:alice-cd4051-analog-mux-ug [03 May 2021 20:05]
Doug Mercer [Building the Mux]
university:tools:m1k:alice-cd4051-analog-mux-ug [08 Apr 2022 20:05]
Doug Mercer [Multichannel analog inputs for the ADALM1000 Using the CD4051]
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 ======Multichannel analog inputs for the ADALM1000 Using the CD4051====== ======Multichannel analog inputs for the ADALM1000 Using the CD4051======
  
-The two analog input channels of the ADALM1000 (M1k) provide a high input impedance and wide dynamic range which is very helpful for many of the measurements that students would be making around their laboratory activities. However, there are only the two analog inputs. Often, there are many more than two signals in the circuit or system under investigation that the students would like to monitor. Or there could be a number of low bandwidth sensors, such as ambient temperature or light levels around a room, that need to be measured or monitored over a long duration of time when gathering experimental data. Any number of external analog multiplexer integrated circuits could be used to expand the number of voltage input channels. The widely available CD4051 single 8 to 1 analog multiplexer IC can be used can be used for this purpose. Note that the 74HC4051 version has a much lower Ron than the higher voltage CD4051. The rest of this document provides the connections needed for use with the ALICE desk-top External Analog Mux option (as of May 2021 version release).+The two analog input channels of the ADALM1000 (M1k) provide a high input impedance and wide dynamic range which is very helpful for many of the measurements that students would be making around their laboratory activities. However, there are only the two analog inputs. Often, there are many more than two signals in the circuit or system under investigation that the students would like to monitor. Or there could be a number of low bandwidth sensors, such as ambient temperature or light levels around a room, that need to be measured or monitored over a long duration of time when gathering experimental data. Any number of external analog multiplexer integrated circuits could be used to expand the number of voltage input channels. The widely available CD4051 single 8 to 1 analog multiplexer IC can be used can be used for this purpose. Note that the 74HC4051 version has a much lower Ron than the higher voltage CD4051. ​In addition the PDIP versions of the MAX4617 and MAX4581 are pin compatible with the industry-standard 74HC4051.  
 + 
 +The rest of this document provides the connections needed for use with the ALICE desk-top External Analog Mux option (as of May 2021 version release).
  
 =====Alternating Sweep Modes===== =====Alternating Sweep Modes=====
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 It is important to note that the manufacturer has included a jumper, JP1, on the top side of the board, which shorts VEE to GND. The board ships with this shorted so connecting VEE to GND externally may not be necessary. It is important to note that the manufacturer has included a jumper, JP1, on the top side of the board, which shorts VEE to GND. The board ships with this shorted so connecting VEE to GND externally may not be necessary.
  
-Connecting the S2 address input to GND rather than +5 V will switch to using the other four Y0, Y1, Y2, Y3 Mux inputs. IF the E enable input is grounded and PIO 2 is used drive the S2 input then the Mux Enable check box can be used to switch between ​group the two groups of four inputs.+Connecting the S2 address input to GND rather than +5 V will switch to using the other four Y0, Y1, Y2, Y3 Mux inputs. IF the E enable input is grounded and PIO 2 is used drive the S2 input then the Mux Enable check box can be used to switch between the two groups of four inputs.
  
 =====Be Aware when using Chop Sweep Mode===== =====Be Aware when using Chop Sweep Mode=====
university/tools/m1k/alice-cd4051-analog-mux-ug.txt · Last modified: 08 Apr 2022 20:05 by Doug Mercer