SNAA366 October   2022 LMX1204

 

  1.   Abstract
  2.   Trademarks
  3. 1Introduction
    1. 1.1 Basic Clock Distribution System
    2. 1.2 Pre-multiplier Stage
  4. 2Low-Frequency Reference
    1. 2.1 Pre-multiplier Stage
    2. 2.2 LMX1204 Multiplier Stage
    3. 2.3 LMX1204 Multiplier vs RF Synthesizer
  5. 3Real-World Application With AFE7950 RF Sampling Transceiver
    1. 3.1 AFE7950 Clocking Measurement Setup
    2. 3.2 AFE7950 Clocking Measurement Results
  6. 4Conclusion

3.1 AFE7950 Clocking Measurement Setup

Measurement testing uses the cascaded LMX1204 reference design in conjunction with the AFE7950 EVM. The clock source is the Wenzel Oscillator pre-multiplied to 1474.56 MHz. The AFE7950 is programmed to for a 5898.24-MHz sample clock. The numerically controlled oscillator in the AFE7950 is set to 3500 MHz. The digital baseband signal is nearly 10 MHz. The DAC data rate is 491.52 MSPS; the ADC data rate is 245.76 MSPS. Figure 3-2 illustrates the measurement setup.

Figure 3-2 AFE7950 Measurement Setup With LMX1204 Clock Distribution