Is there any simulation model associated with the MCP3008 ADC component? My schematic containing this component, but the ADC output remains stuck at 0 although the input levels and timings are correct.
Sorry but there is no simulation model for the MCP3008.
Mixed signal devices of this type generally do not have spice models.
Whilst it is possible to create models that represent some of the behaviour of such devices, modelling to the level of the SPI bus interfacing in a spice simulator is a major task and is probably beyond the scope of what we can undertake at this time.
If you are concerned about driving the MUX inputs of the ADC then you can model this fairly simply using the information given in `Section 4.1 Analog Inputs` and `FIGURE 4-1: Analog Input Model.` of the MCP3004/3008 datasheet:
http://ww1.microchip.com/downloads/en/DeviceDoc/21295d.pdf
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