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THS4552: THS4552 Vin power question

kerr chang
Genius 4075 points
Part Number: THS4552

Hi Team

         I have check THS4552 SPEC, 

The Absolute Maximum Ratings for Vs+ - Vs- = 5.5V
Input/output voltage range is (Vs-)-0.5 and (Vs+)+0.5
BTW
SPEC page 32 : Figure 71. DC-Coupled, Single-Ended to Differential Attenuator Design
It have show VS+ = 5V / VS- = -0B. but Vs = +/- 18 for IN- 
Is it working? Why?
another question.
If my Vs+=5V, Vs-=0V，Vcom=2.5V.
Can I use input signal in -150mV~150mV ?
If yes , is Vcom=2.5V ?
  • 0
    Guru 140200 points

    Hi Kerr,

    it works because of the resistive voltage divider RG1 and RF1. This decreases the input voltage swing at the output of OPAmp.

    Yes, +/-150mV is possible. Figure 71 also shows a bipolar input voltage. And yes, Vcom is 2.5V.

    Always when using a single supply, a reference voltage (here midsupply) must be generated to allow a bipolar input signal swing to create a bipolar output signal swing.

    Kai

  • 0 in reply to kai klaas69
    Guru 48165 points

    Hello Kerr, 

    without your specific circuit, hard to tell for sure about that +/-.15V input - probably will be fine with that 2.5V Vocm control as the common mode loop will level shift the input pins up.Your source needs to sink that level shift current, the actual range for the input pins is limited to -0.1V on single supply as shown in the specs here - also, I tried to restate some of the I/O swing issues I put into the datasheets in the 2nd part of this article, 

    https://www.planetanalog.com/author.asp?section_id=3404&doc_id=564993