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

2 The LMK6Bx BAW Oscillator

The LMK6Bx BAW oscillator is a fixed-frequency, factory-programmed, ultra-low jitter oscillator with AC-LVPECL, LVDS, HS-LVDS, Custom Swing (50MHz to 2500MHz), and LP-HCSL (50MHz to 625MHz) differential otuput type options and supports 2.5V and 3.3V. Both the HS-LVDS and Custom Swing output types swing can be programmed in 50mVppd steps from 350mVppd up to 2Vppd for 3.3V supply and for 2.5V supply up to 1.5Vppd for Custom Swing and 1.6Vppd for LVDS. The LMK6Bx also has two function pins. Pin 1 has output enable (OE) or standby (ST) control and pin 2 offers and optional output frequency selection (FSEL), where the frequency specified in the OPN can be divided by 2 or 4. Figure 2-1 shows a block diagram of the LMK6Bx.

LMK6Bx Simplfied Block Diagram Figure 2-1 LMK6Bx Simplfied Block Diagram

Table 2-1 summarizes the LMK6Bx's ultra-low jitter and industry-leading performance for different output types and selected frequencies, including 4MHz high-pass filter (HPF) measurements.

Table 2-1 LMK6B Jitter Specifications
Output Type Output Frequency (MHz) Typical RMS Jitter (fs, 12kHz to 20MHz)(1) Typical 4MHz HPF RMS Jitter (fs, 12kHz to 20MHz)(1)
AC-LVPECL(1) 156.25 45 31
312.5 28 19.7
625 18 9.6
1250 17 6.3
2500 16 3.4
LVDS 156.25 58 47.6
312.5 36 26.3
625 25 11.6
1250 22 7.8
2500 21 4.7
HS-LVDS (1.2Vppd swing) 156.25 50 40.2
312.5 35 25.1
625 20 9.3
1250 19 6.9
2500 17 3.8
LP-HCSL (VOH = 850mV) 156.25 44 34.8
312.5 33 20.0
625 25 12.2
(1) The AC-LVPECL driver uses the Custom Swing driver, AC-LVPECL means the swing is set to 1.6Vppd.

For more information about the LMK6Bx, please refer to the LMK6Bx data sheet.