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Original question:

TL3474: PSRR vs Freq.

TL3474A: Input Common Range

Brian Wang0928
Genius 12810 points
Part Number: TL3474A
Other Parts Discussed in Thread: TL3474, TL3472

I'd like to know the common mode input range for TL3474 when VCC+=18V and VCC-=0V. What's the minimum input common mode voltage? 0V or ?Thanks. 

Regards

Brian W

  • 0
    Guru 140200 points

    Hi Brian,

    yes, according to the datasheet the minimum common mode input voltage is 0V.

    Kai

  • Former Member
    0 Former Member

    Hi Brian,

    The datasheet lists the common mode range for a +/-15V supply as -15V to 12.8V.  This corresponds to a range of V- to (V+) - 2.2V.  So, for supplies of 0 and 18V, your common mode input range will be 0 to 15.8V.

    Regards,

    Daniel

  • 0
    TI__Guru*** 149776 points

    Hello Brian,

    The term single supply (in the device title) means that input range includes the negative supply rail so that rail can be grounded. It also means that the output range gets close to ground but maybe not all the way. TL3472 VOL is typically 0.1V with a 2k load to ground. The TL3472 actually fights the 2k load a little bit. 

    Minimum input range will be 0V

  • 0 in reply to Ron Michallick
    TI__Genius 12810 points

    One more question, With configuration of the single supply by 0Vdc(VCC-) to 18Vdc(VCC+), once VCC+ is up to 20Vdc, what happens? Can the device be damaged by over voltage? If not so, what's the allowable max. VCC+? 36V? Very thanks !

    Regards

    Brian W

  • 0 in reply to Brian Wang0928
    Guru 140200 points

    Hi Brian,

    nothing bad will happen:

    But guarantee that the input voltages are never exceeding the supply rails, according to the absolute maximum ratings specifications.

    Kai

  • Former Member
    0 Former Member in reply to Brian Wang0928

    Brian,

    Kai's suggestions are correct.  V- = 0 with V+ = 18/20V will work fine all the way to V+ = 36V.

    And again, make sure your input voltage is within the recommended range for normal operation and within the absolute maximum range to avoid damage.

    Regards,

    Daniel