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TL441: does it work with a single supply?

Lenio Cacula
Genius 17050 points

Part Number: TL441

What are the conditions to make the TL441 work with a single supply, say +5V? Should the ground in the device be shifted? Could TL441-ground and Vcc- be connected together to power-ground? Should the input signal be shifted to make it work? Any comments are highly appreciated!

Thank you!

  • +1
    TI__Guru* 93105 points

    Hello Lenio,

    The TL441 Log amplifier is designed to be used with dual polarity power supplies, ideally VCC± = ±6 V as the datasheet indicates. Connecting Vcc- to GND would not provide correct functionality of the TL441.

    If you don't have access to a negative supply in the application I suggest adding a boost/buck regulator that provides the inverse polarity of the applied input voltage. For example, if only +6 V is available an inverting boost/buck regulator provides the -6 V. TI produces many different boost/buck and charge pump products. If you decide to go that route the folks who support TI's Power Management Products e2e could provide you with their best recommendations. 

    Regards, Thomas

    Precision Amplifiers Applications Engineering