down pin of the LM4916 is also being driven by an open

drain output of an external microcontroller on a separate

supply. This circuit ensures that shutdown is disabled when

powering up the LM4916 by either allowing shutdown to be

high before the LM4916 powers on (the microcontroller pow-

ers up first) or allows shutdown to ramp up with V

LM4916 powers up first). This will ensure the LM4916 pow-

ers up properly and enters the correct mode of operation.

Please note that the SE/BTL pin (Pin 8) should be tied to

GND for Single Ended mode, and to V

20048753

FIGURE 4. Recommended Circuit for Different Supply Turn-On Timing

www.national.com

12