TMS320F280049M: F280049 DAC Output pull-down resistor

Hi Joe,

On F2837x and F2807x devices, the DAC will still load the pin even when disabled, so there was effectively a pull-down. On F28004x devices, we have added additional muxing to isolate out this parasitic resistance when the DAC is disabled. You don't have to worry about this on F28004x.

Hi Devin,

What means "will still load the pin even when disabled, so there was effectively a pull-down"? Why it should add a 50K pull down resistor?

Thanks!

BR

Joe

Hi Joe,

On F2837x and F2807x devices, the DAC is still physically connected to the pin net even when it is disabled. There isn't a MUX or switch to isolate it. Because of this, the internal architecture of the DAC causes a parasitic load on the pin. This is roughly equivalent to a 50Kohm pull-down.

Hi Devin,

Very Clear! Thanks!