SPRUJ17H March 2022 – October 2024 AM2631 , AM2631-Q1 , AM2632 , AM2632-Q1 , AM2634 , AM2634-Q1
The following equations can be used to derive a theoretical filter output of an SDFM filter output for both a comparator filter and a data filter.
Where:
For example, when using the AMC1306x25 modulator:
AMC1306x25 | Vclipping = | 320 mV |
Input voltage (AINP - AINN) = | 100 mV | |
SDFM filter settings | Filter type = | 3 |
Comparator OSR (COSR) = | 32 | |
Data filter OSR (DOSR) = | 100 |
Density of ones in bitstream | Using Equation 17 | 0.65625 |
Comparator filter output | Using Equation 18 | 21504 |
Filter type = Sinc3 | ||
COSR = 32 | ||
Data filter output (32-bit) | Using Equation 19 and Equation 20 | 312500 |
Filter type = Sinc3 | ||
DOSR = 100 | ||
Data filter output (32-bit) | Using Equation 21 | 9765 |
Filter type = Sinc3 | ||
DOSR = 100 | ||
(Right shift by 5) |