SDAA294 March   2026 LMK6B

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2The LMK6Bx BAW Oscillator
  6. 3TI Clock Buffers
    1. 3.1 The LMKDB1x LP-HCSL Buffer Family
    2. 3.2 The LMK1Dx LVDS Buffer Family
  7. 4Clocking LMKDB1x with LMK6Bx
    1. 4.1 Clocking LMKDB1x Buffer with a LP-HCSL Oscillator
  8. 5Clocking the LMK1Dx with the LMK6Bx
    1. 5.1 Clocking LMK1Dx Buffer with a LP-HCSL Oscillator
  9. 6Summary
  10. 7References

4.1 Clocking LMKDB1x Buffer with a LP-HCSL Oscillator

The LMK6BIx (LP-HCSL output type with VOH = 850mV) can replace any LP-HCSL oscillator clocking the LMKDB1x. Figure 4-4 demonstrates the required biasing to clock the LMKDB1x with a LP-HCSL oscillator. Make sure the 50Ω internal termination of the LMKDB1x is turned off. For any other oscillator replacement guidance, see the LMK6Bx data sheet.

LMK6BIx Oscillator Termination Required to Drive the LMKDB1x LP-HCSL Buffer Figure 4-4 LMK6BIx Oscillator Termination Required to Drive the LMKDB1x LP-HCSL Buffer

Table 5-4 summarizes the RMS jitter (with and without a 4MHz HPF) of the LMKDB1x when clocked by the LMK6BIx and Figure 4-5 and Figure 4-6 showcase each corresponding phase noise plots.

Table 4-2 LMK6BIx and LMKDB1x Performance Summary (3.3V Supply)
Output Frequency (MHz) LMK6BIx RMS Jitter (fs)(1) LMK6BIx + LMKDB1x RMS Jitter (fs)(1) LMK6BIx 4MHz HPF RMS Jitter (fs)(1) LMK6BIx + LMKDB1x 4MHz HPF RMS Jitter (fs)(1)
156.25 46.5 49.6 34.8 37.1
312.5 30.2 31.2 20.0 21.2
(1) RMS jitter calculated from 12kHz to 20MHz integrated bandwidth.
LMK6BIx and LMK6BIx + LMKDB1x Phase Noise Curves at 156.25MHz and 3.3V Figure 4-5 LMK6BIx and LMK6BIx + LMKDB1x Phase Noise Curves at 156.25MHz and 3.3V
LMK6BIx and LMK6BIx + LMKDB1x Phase Noise Curves at 312.5MHz and 3.3V Figure 4-6 LMK6BIx and LMK6BIx + LMKDB1x Phase Noise Curves at 312.5MHz and 3.3V