LTspice
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LTspice® is a powerful, fast, and free SPICE simulator software, schematic capture and waveform viewer with enhancements and models for improving the simulation...
LTspice on Analog.com
ADG408
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The ADG408 is a monolithic CMOS analog multiplexer comprising 8 single channels. The ADG408 switches one of eight inputs to a common output as determined...
Datasheet
ADG408 on Analog.com
ADG409
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The ADG409 is a monolithic CMOS analog multiplexer comprising four differential channels. The ADG409 switches one of four differential inputs to a common...
Datasheet
ADG409 on Analog.com
I've been trying to perform a basic transient analysis within LTSpice using the ADG408 multiplexer, and have been getting very strange results:
I've tried a variety of configurations, and have been unable to get the model to work as expected. Is this a limitation of the model or LTSpice, or am I doing something incorrectly?
I've attached the LTSpice schematic and symbol I created, along with a screenshot showing the unexpected behavior. The A2:A0 pins are driven with 3.3V pulse sources configured to produce a 3-bit binary count pattern.
The ADG409 Spice model produces similar results.
Hi Caleb,
I tried to check on your circuit and it looks like the symbol file does not call the spice model properly.
You might want to update your symbol file and here's what you can do:
3. Click on the save button and try to simulate again.
Kindly take note that LT spice symbol follows the numbering convention 1 to n instead of the node names.
Also, for easier generation of LT spice symbols, you might want to check on the reference article below.
LTspice: Simple Steps to Import Third-Party Models | Analog Devices
Let me know if this helps.
Best Regards,
May
