Hello Mike,
Thank you for the post. The final datasheet does have a typo in Table 12 for the 80MHz sample clock setting. With formatting changes in making the final draft, the enteries were incorrectly updated. Here is the correct cutoff values for 80MHz sample clock at each of the available settings.
| Reg 0Fh<7:3> | Setting | LPF Cutoff Freq (MHz) |
| 0 0000 | 1.3*(1/3.3)*FS | * |
| 0 0001 | 1.2*(1/3.3)*FS | 28.83 |
| 0 0010 | 1.1*(1/3.3)*FS | 26.43 |
| 0 0011 | 1.0*(1/3.3)*FS | 24.02 |
| 0 0100 | 0.9*(1/3.3)*FS | 21.62 |
| 0 0101 | 0.8*(1/3.3)*FS | 19.22 |
| 0 0110 | 0.7*(1/3.3)*FS | 16.82 |
| 0 1000 | 1.3*(1/5)*FS | 20.80 |
| 0 1001 | 1.2*(1/5)*FS | 19.20 |
| 0 1010 | 1.1*(1/5)*FS | 17.60 |
| 0 1011 | 1.0*(1/5)*FS | 16.00 |
| 0 1100 | 0.9*(1/5)*FS | 14.40 |
| 0 1101 | 0.8*(1/5)*FS | 12.80 |
| 0 1110 | 0.7*(1/5)*FS | * |
| 1 0000 | 1.3*(1/6.6)*FS | 15.59 |
| 1 0001 | 1.2*(1/6.6)*FS | 14.39 |
| 1 0010 | 1.1*(1/6.6)*FS | 13.19 |
| 1 0011 | 1.0*(1/6.6)*FS | * |
| 1 0100 | 0.9*(1/6.6)*FS | * |
| 1 0101 | 0.8*(1/6.6)*FS | * |
| 1 0110 | 0.7*(1/6.6)*FS | * |
* = Out of Tunable Range
Please let me know if these clarifies the confusion.
Regards
Gina