SDAA304 March   2026 LMK6B

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2LMK6Bx Oscillator for Optical Transceiver DSP Clocking
  6. 3Revolutionary BAW Technology: Why BAW Technology Dominates
    1. 3.1 Revolutionary Jitter Performance
    2. 3.2 Outstanding Reliability
    3. 3.3 Manufacturing Excellence
  7. 4Industry's Best Jitter Performance at Frequencies Above 312.5MHz: Setting New Standards
    1. 4.1 Unprecedented Low Jitter Specifications
    2. 4.2 Exceptional PSRR Performance
    3. 4.3 Competitive Advantages: Dominating the Market
      1. 4.3.1 LMK6B PSRR Performance Against Competition
      2. 4.3.2 Holistic Competitor Comparison
  8. 5LMK6Bx Description and Other Benefits
    1. 5.1 Comprehensive Output Options, Flexibility, and Other Key Specifications
    2. 5.2 Streamlined In-Chip Integration and Cost Savings
    3. 5.3 Implementation Guidelines to Replace Competition
  9. 6Summary
  10. 7References

4.3.1 LMK6B PSRR Performance Against Competition

Independent testing against leading competitors demonstrates the LMK6B's exceptional PSRR performance. Both tests we're performed with both oscillators operating at 156.25MHz, the LMK6Bx with AC-LVPECL output type and 2.5V supply and oscillator 1 with LVDS output type and 1.8V supply.

Without any decoupling capacitors, the LMK6Bx outperforms Oscillator 1 across all ripple frequencies, achieving 15dBc better PSRR above 5MHz. Figure 4-3 illustrates the setup used to test PSRR for both oscillators and Table 4-5 summarizes the data gathered between oscillators.

PSRR Test Setup Without Any Decoupling Capacitors Figure 4-3 PSRR Test Setup Without Any Decoupling Capacitors
Table 4-5 PSRR Performance Comparison Between LMK6Bx and Oscillator 1 Without Any Decoupling Capacitors
Ripple Frequency LMK6B Spur (dBc) Oscillator 1 Spur (dBc)
50kHz -60.41 -60.40
100kHz -61.20 -60.01
200kHz -62.12 -60.44
500kHz -63 -61.8
1MHz -61.77 -61.23
2MHz -64.95 -59.243
5MHz -73.85 -58.65
10MHz -76.88 -61.49
15MHz -79.33 -64.873
19MHz -81.3 -67.87
20MHz -81.11 -68.47

With a 0.1μF decoupling capacitor, the LMK6Bx achieves 3dBc to 6dBc better performance than Oscillator 1 across all ripple frequencies. The LMK6Bx performs less than 71dBc per spur for ripple frequencies above 50kHz. Figure 4-4 shows the setup used to test PSRR for both oscillators and Table 4-6 summarizes the data obtained.

PSRR Test Setup With a 0.1μF Decoupling Capacitors Figure 4-4 PSRR Test Setup With a 0.1μF Decoupling Capacitors
Table 4-6 PSRR Performance Comparison Between LMK6Bx and Oscillator 1 with a 0.1μF Decoupling Capacitor
Ripple Frequency LMK6B Spur (dBc) Oscillator 1 Spur (dBc)
50kHz -71.21 -68.26
100kHz -72.11 -65.59
200kHz -75.56 -69.89
500kHz -80.68 -75.96
1MHz -88.36 -85
2MHz -93.80 -90.24
5MHz -100.25 -93.70