LTM8060 Phase Relationships Clarification

Question

Accepted Answer

Issue: 
 The datasheet for the LTM8060 does not describe how the phases of Vout1 and Vout2 are related. This leads to confusion when trying to set up the clocking for a multiphase design, like that in Figure 21: 
 
 It is unclear if the LTC6909 is configured for 0 degrees, 90 degrees, 180 degrees, and 270 degrees or 0 degrees, 45 degrees, 90 degrees, and 135 degrees. The former would suggest that Vout1 and Vout2 for each chip would be in phase and have 90-degree spacing between phases, and the latter would suggest that Vout1 and Vout2 would be 180 degrees out of phase, leading to 45-degree spacing between phases. 
 Resolution: 
 Vout1 and Vout2 are by default 180 degrees out of phase with each other. Vout3 and Vout4 are the same; they are also 180 degrees out of phase with each other. Thus, the 4 clock outputs in the example design are 0 degrees, 45 degrees, 90 degrees, and 135 degrees, to give an 8-phase design with 45-degree spacing between phases.

Popular Forums

Product Forums

Application Forums

Design Center Forums

Highlighted Webinar

Places

Libraries

Latest Webinars

Challenge Yourself!

What's Brewing

Places

Resources

Highlighted Blogs

Latest Blogs

ADI Blogs

Visit ContentZone

Featured Content

View Content By Industry

View Content By Technology

Products Mentioned

LTM8060: FAQ