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THS4511: THS4511 spec question

Arking Chiu
Intellectual 790 points

Part Number: THS4511

Hi,

base on THS4511 DS, the utput voltage is 1.25 to 3.75V.

but the DS figure11 X axis show the Vcm form -1V to 1V.

how to understand the Vcm value? is the CM voltage be AC single?

  • 0
    TI__Genius 12631 points
    Hello Arking,
    On Page 5, under OUTPUT, the amplifiers output swing is from 1.2V to 3.8V when operating from 0V to 5V supplies. On split +/-2.5V supplies, that translates to -1.3V to 1.3V.

    Also on Page 5, under OUTPUT COMMON-MODE VOLTAGE CONTROL, the common-mode input spec into the amplifier is 1.25 to 3.75V for single-supplies, or -1.25V to 1.25V on split supplies. This is the linear range of voltages that you can apply at pins 4 and 9 that control the output common-mode of the amplifier. These specs are purely DC in nature.

    The results that you are seeing in Figure 11 is measuring the amplifier performance at AC. The -1.0V to 1.0V spec is with reference to the output common-mode at mid-supply. It is cautioning you that while the amplifier is spec'ed for an output common-mode from -1.3V to 1.3V (wrt to the output common-mode voltage, 2.5V in this case) the linearity performance is very good for output common-modes from -0.8V to 0.5V and degrades outside those boundaries.

    -Samir