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university:tools:m1k:analog-mux [21 Mar 2022 15:41]
Doug Mercer add link to another analog mux board
university:tools:m1k:analog-mux [08 Apr 2022 19:58]
Doug Mercer add MAX4618 and MAX4582 as options
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 The two analog input channels of the ADALM1000 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 you 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 long duration times when gathering experimental data. As a solution to this need, the following multi-channel analog multiplexer is proposed. The two analog input channels of the ADALM1000 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 you 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 long duration times when gathering experimental data. As a solution to this need, the following multi-channel analog multiplexer is proposed.
  
-A first incarnation of this very simple design uses one CD4052 dual 4:1 analog multiplexer (or the equivalent 74HC4052/​74HCT4052 ) to switch one or both analog input channels, see the schematic in figure 1. The 4:1 mux added to the two input channels allows the board to measure up to 8 signal channels. More information and CAD design files for this and the other ADALM1000 accessory boards can be found [[university:​tools:​adalm1000:​accessory-boards-index|on this Wiki page]].+A first incarnation of this very simple design uses one CD4052 dual 4:1 analog multiplexer (or the equivalent 74HC4052/​74HCT4052 ) to switch one or both analog input channels, see the schematic in figure 1. In addition the PDIP versions of the MAX4618 and MAX4582 are pin compatible with the industry-standard 74HC4052. 
 + 
 +The 4:1 mux added to the two input channels allows the board to measure up to 8 signal channels. More information and CAD design files for this and the other ADALM1000 accessory boards can be found [[university:​tools:​adalm1000:​accessory-boards-index|on this Wiki page]].
  
 {{ :​university:​tools:​adalm1000:​analog-mux-bw-sch.png?​550 |}} {{ :​university:​tools:​adalm1000:​analog-mux-bw-sch.png?​550 |}}
university/tools/m1k/analog-mux.txt · Last modified: 08 Apr 2022 19:58 by Doug Mercer