dramrattan
Member
Hi,
The attached DTMF decoder configuration was taken from the datasheet of the MT8870 DTMF decoder but i'm seeing that in order to calculate the gain, the gain formula have a S...What is this S?... Do i just use the gain as Rf on R? The equation is on page 9 of the attached document.
Regards.
The attached DTMF decoder configuration was taken from the datasheet of the MT8870 DTMF decoder but i'm seeing that in order to calculate the gain, the gain formula have a S...What is this S?... Do i just use the gain as Rf on R? The equation is on page 9 of the attached document.
Regards.