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THS4551: Design for ABZ Encoder

Brian Wang0928
Genius 15080 points

Part Number: THS4551
Other Parts Discussed in Thread: TINA-TI

Team,
Here's an optimized version of your text:

"The customer is designing an ABZ signal system using the THS4551 to convert single-ended signals to differential outputs for a Linear Motor Encoder application. The RD confirmed that the design works correctly for SIN/COS signal inputs (A/B). However, when a square signal (Z) is applied, the output waveform becomes abnormal.

Specifications:

  • Type: Single-ended input to differential output converter
  • OPA Bias Power: 3.3V
  • Input Signal Level: 0 - 3.3V (Square signal)
  • Output Signal Level: +/-1Vpp (Square signal)
  • Application: Linear Encoder
  • Freq: 100KHz

Attached is the simulation design." Screenshot 2025-12-22 155841.png 

 

 

 

Regards

Brian

  • 0
    TI__Mastermind 24524 points

    Hello Brian,

    I will build up a copy of this circuit to simulate in TINA-TI and provide the results and my findings here.  

    Please note: the THS4551 FDA is only rail-to-rail on the input when swinging low to VS-, the THS4551 FDA cannot swing to VS+ at the inputs.  The outputs are rail-to-rail.

    Please try using a 5V supply in simulation to see if the issue resolves.  You can review the input common-mode range for the THS4551 FDA in the device datasheet.  This information can be found in the electrical characteristics table.

    Best,

    Alec

  • 0 in reply to Alec Saebeler
    TI__Genius 15080 points

    Thanks Alec and i'll check with customer if 5VCC is acceptaible in their system or not! And we looking forward your sim result.

    Regards and Merry X's MAS

    Brian

  • 0 in reply to Brian Wang0928
    TI__Mastermind 24524 points

    Hello Brian,

    Hope you had a good holiday; I will await an update from your customer & make progress on the sim.

    Best,

    Alec