Part Number: LMX2571
Hi allWould you mind if we ask LMX2571?There is the description on the data sheet P44 "22.214.171.124 Detailed Design Procedure ～ To use the direct digital modulation feature, put fractional denominator, DEN = 0."Why should it set DEN=0 in case of direct digital modulation feature?We are sorry that we could not find it.Kind regards,Hirotaka Matsumoto
Table 14 (R24) description for field "FSK_EN_F2" states:
Enables FSK operation in all FSK operation modes. When this bit is set, fractional denominator DEN should be zero.
Table 23 (R8) description for field "FSK_EN_F1" refers to the definition in Table 14, so the function of the F1 and F2 FSK enables is identical. If FSK is used with either F1 or F2, DEN should be zero.
Compare this with the design in section 8.2.2, where no FSK is used and the device is only switching between F1 and F2. Table 43 shows the denominator is set to 1234567. If switching between F1 and F2 is the only requirement, and FSK is not enabled for either frequency, there is no restriction on DEN.
We are glad that we were able to resolve this issue, and will now proceed to close this thread.
If you have further questions related to this thread, you may click "Ask a related question" below. The newly created question will be automatically linked to this question.
All content and materials on this site are provided "as is". TI and its respective suppliers and providers of content make no representations about the suitability of these materials for any purpose and disclaim all warranties and conditions with regard to these materials, including but not limited to all implied warranties and conditions of merchantability, fitness for a particular purpose, title and non-infringement of any third party intellectual property right. No license, either express or implied, by estoppel or otherwise, is granted by TI. Use of the information on this site may require a license from a third party, or a license from TI.
TI is a global semiconductor design and manufacturing company. Innovate with 100,000+ analog ICs andembedded processors, along with software, tools and the industry’s largest sales/support staff.