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Pspice Model for TS12A4514

Narasimha LV
Prodigy 130 points
Other Parts Discussed in Thread: TS12A4514, TS12A4515

Hi ,

 

We wanted to use below part in our design and we need to simulate  and validate the part behavior. So  could you please provide the PSPICE MODEL for the same.

 

Part#: TS12A4514

SPST CMOS ANALOG SWITCHES

 

Regards,

Narasimha LV

  • 0
    TI__Mastermind 45420 points

    Narasimha,

    This device is a passive FET switch that can be modeled ideally modeled as a 0 ohm wire.  The one pin of the switch will be the Drain and the other pin will be the source of the FET.  You can make a basic model of the parasitic of the FET from parameters in the datasheet.  You can use the series on-state resistance and the on state capacitance to ground to show the parasitic RC low pass filter a signal will encounter as it passes through the signal path.  

    What type of signal are you trying to model in your system?  Will the basic low pass filter model work for your application?

    We do not have a Spice model on the web for this basic switch and it could take several weeks to create.  Is this still something you need? 

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Prodigy 130 points

    Hi,

    Thanks for your response.

    We wanted to use this part for below application:

    7.5V and 0V PWM signal will be connected to COMM, 5V will connected to V+ and IN pin will be controlled by digital control signal 3.3V driven by Microcontroller. Microcontroller has to control the Switch so that PWM signal has pass through the switch.

    Will it work this way? please confirm.

    Regards,

    Narasimha LV

  • 0 in reply to Narasimha LV
    TI__Mastermind 45420 points

    Narasimha,

    No, you may not operate the TS12A4515 the way you describe because it violates the recommended operating conditions in the datasheet.

    If you operate the device with V+ = 5V you many not place a signal on the COM,NC, or NO pin >V+. 

    In order to place 7.5V on the signal path you need to have V+ >= 7.5 V. 

    I do not know of any switches we have that can pass 7.5 V with the supply voltage equal to 5 V. 

    Thank you,

    Adam

  • 0 in reply to Adam Torma
    Prodigy 130 points
    HI Adam,

    Thanks for the response.
    Can this device compatible with 8V power supply, can I give typical 7.5V on V+, PWM signal (7.5, 0V) pass through COMM and NO and 3.3V digital control signal from microcontroller.

    Will it work?

    what is the difference between TS12A4514 and TS124515.

    Regards,
    Narasimha LV
  • 0 in reply to Narasimha LV
    TI__Mastermind 45420 points

    Narasimha,

    Yes the datasheet says the recommended operating condition of V+ to between 3 and 12.6 V. 

    The datasheet has a minimum value for a logic level high (Vih) of 5 V when the supply V+ = 12V.  This vih value will vary with the supply voltage V+ but unfortunately we do not have any data on the vih value when V+ = 8V.

     

    We do have a large range of level shifters on ti.com that can help translate the 3.3V logic signals to 5V levels.  You can place a question on the level shifter e2e forum for assistance with these types of ICs.

    Thank you,

    Adam