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PGA113 Pspice model

Arang Liang1
Prodigy 120 points
Other Parts Discussed in Thread: PGA113, PGA113EVM-B, OPA364

Hi :

Can TI provide PGA113 Pspice model  for reference ? 

thx

Best Regards,

Arang

  • 0
    TI__Expert 8455 points

    Hi Arang,

    The PGA113 was developed and introduced to the market over a decade ago and unfortunately no SPICE model was developed for this part. The best way to get familiar with this device is through our evaluation module PGA113EVM-B. I checked the inventory on ti.com and we do have this evaluation module in stock.

    https://www.ti.com/tool/PGA113EVM-B

    Regards,

    Zach

  • 0 in reply to Zach Olson
    Prodigy 120 points

    thanks for your suggestion.

  • 0 in reply to Zach Olson
    Prodigy 120 points

    Hi ,

    I want to change my circuit to use PGA113,

    original circuit as attached file,

    could you help to provide reference design circuit  to use PGA113  for my circuit ? 

    thx

    Best Regards,

    Arang

  • +1 in reply to Arang Liang1
    TI__Expert 8455 points

    Hi Arang,

    It looks like you are intending to use the PGA113 as a simple programmable gain block to replace the fixed-gain amplifier in your circuit. The PGA113 has some additional features such as an input multiplexer and internal calibration channels that can be used for system-level calibration. Are you looking for a reference design that includes the calibration or multiplexer features?

    Figure 72 from the PGA113 datasheet shows a typical configuration using the calibration channels. Note that Vcal/CH0 must be connected to the ADC reference potential to use the calibration (in this figure it is connected to AVDD because this is equal to the ADC Ref voltage). The PGA113 VREF pin must be connected to a low-impedance reference capable of sourcing and sinking at least 2mA. Figure 72 shows the OPA364 in a buffer configuration to provide the low-impedance voltage to the VREF pin.

    If you do not require the calibration feature you may use the configuration shown above and simply use the multiplexer to select CH1 as your input. 

    I see your input source is expected to be between 30mV and 500mV at 1550Hz but the schematic does not show what this is referenced to. Is this 30mV-500mV input signal referenced to ground? Or is it referenced to the 1.65V mid-supply?

    What type of sensor is connected to the input? If this input signal is connected to the outside world you may need to include some protection circuitry in case of an electrical overstress event. This article provides helpful information on electrical overstress protection: https://www.ednasia.com/provide-robust-input-overvoltage-protection-for-amplifier-analog-input-modules/.

    Regards,

    Zach