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Original question:

LM27761: Effect on TLV4170 op-amp

TLV4170: Instrumentation Amplification not happening.

saand mdftgh
Prodigy 65 points
Part Number: TLV4170
Other Parts Discussed in Thread: OPA4170, TLV9004

Hi .. 

            We are using TLV4170 as an instrumentation amplifier configuration with single supply voltage topology. What we are facing the issue is with 3.3Volts supply. For 5v supply , no issues were found. The issue was the amplification not happened when simulating through TINA software when we using 3.3 Volts. Can you please help in this issue. Attached was the schematic in TIna 

Regards..

Sandeep. signamp_tlv.TSC

  • 0
    TI__Guru*** 140026 points

    Sandeep,  Welcome to the e2e forums.

    The OPA4170 is not rail to rail input. The model will have poor results as a warning when the input range is close to the end. The OPA4170 can run on 3.3V, however it is not the best idea as the input range limitations will require careful attention. At 3.3V or even 5V, there are many better choices, such as TLV9004