For a single frequency, there may be multiple F and M combinations that exist; however, the correct F/M values will depend on the application. For quick response times, it is recommended to keep M constant and adjust F to step the frequency and achieve near the desired output frequency. For high-accuracy, it is recommended to implement an algorithm that would find the best F/M ratio to achieve the greatest accuracy. The trade-offs between these two methods is accuracy vs. response time.