• State TI Thinks Resolved
  • Replies 8 replies
  • Answers 2 answers
  • Subscribers 50 subscribers
  • Views 178 views
  • Users 0 members are here
Support feedback
Options
Options
Similar topics

OPA4202: OPA4202ID

SUGANYA R
Prodigy 70 points
Part Number: OPA4202
Other Parts Discussed in Thread: OPA202, TINA-TI

Kindly provide the TINA simulation for the above circuit. 

  • 0
    TI__Guru 60610 points

    Suganya,

    OPA4202 is a bipolar input quad amplifier with back-to-back input protection diodes between the input terminals - see below. 

    For this reason, it is NOT well-suited for the comparator application you seem to try to implement in your schematic.  Since its absolute maximum differential voltage is limited to just +/-0.5V, using it as comparator may result in erroneous voltage tripping point - see below.

    If you need further assistance, please provide basic information like what is it exactly that you try to do?  Also, please provide information about voltage supplies and the range of the input voltages applied to the input of the amplifier.  Btw, what sort of Tina simulation are you asking for?  AC, DC, transient, etc.?

  • 0 in reply to Marek Lis
    Guru 244370 points

    The output and inverting input have the same label, so this might be a voltage follower. But then the 0R connection does not make sense.

    Please provide a fixed schematic. And what is the actual problem you're trying to solve?

  • 0 in reply to Clemens Ladisch
    Prodigy 70 points

    Currently in my schematic the unity gain OP-amp which is DNP (donot populate ) in my board. When it is in DNP, we need to place this 0R for connectivity to OPAMP_OUT0 then to 301R. When this OP-AMP is not DNP ( i.e. when it is populated in board ) , then the 0R resistor will be removed and DAC_OUT0 directly connected to OP-AMP's DAC_OUT0

  • 0 in reply to SUGANYA R
    TI__Guru 60610 points

    Please provide information about voltage supplies and the range of the input voltages applied to the input of the amplifier.  Btw, what sort of Tina simulation are you asking for?  AC sweep, DC sweep or transient response, etc.?

  • 0 in reply to Marek Lis
    Prodigy 70 points

    OPAMP voltage supply = +/- 15V. The AC sweep and DC sweep TINA simulation is required.

  • 0 in reply to SUGANYA R
    TI__Guru 60610 points

    First, you need to make sure that with 10nF load the circuit is still stable - with 95 degrees phase margin, it is in fact very stable (see below).

    Running a small-signal transient analysis confirms circuit stable operation with no overshoot shown - see below.

    Its small-signal transient response is controlled by the low-pass filter at the output.

    Running AC sweep show -3dB frequency response is set by the R1||C1 low-pass filter. 

    The linear range of the the buffer circuit is limited by the OPA202 input common-mode voltage range of: (V-)+1.5V < Vcm < (V+)-1.5V (see datasheet).

    Below I have attached Tina-TI schematics for you convenience.  You may download free Tina-TI: https://www.ti.com/tool/TINA-TI

    Please review TI Precision Labs tutorial to learn about op amp limitations and how to simulate different conditions:  

    https://www.ti.com/video/series/precision-labs/ti-precision-labs-op-amps.html

    OPA202 AC Stability.TSCOPA202 Transient Small Signal Response.TSCOPA202 AC Response.TSCOPA202 DC Sweep.TSC

  • 0 in reply to Marek Lis
    Prodigy 70 points

    can you please suggest a suitable alternate for DAC LTC2664CUH12-#PBF in TI and provide simulation of opamp along with dac.

    DAC supply voltage is +/-15V

  • 0 in reply to SUGANYA R
    TI__Guru 60610 points

    Suganya,

    For the alternative to DAC LTC2664CUH12-#PBF, you need to contact appropriate DCC-DAC product line.  Just so you know, E2E is a support forum helping with design related problems and not a design house.  You need to do diligence in your design efforts especially in case of very limited design description in line with  "kindly provide the TINA simulation for the above circuit."