SNAA400 March   2025 CDC6C , LMK6C , LMK6D , LMK6H , LMK6P

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2BAW Overview
    1. 2.1 BAW Oscillator Advantages
    2. 2.2 BAW Oscillator Overview
  6. 3LMK6C Clocking Sitara AM64 Jitter Test
    1. 3.1 Jitter Test Set Up
  7. 4Generic Guide for Clocking AM6x and TDA4x Families
  8. 5Summary
  9. 6References

2.1 BAW Oscillator Advantages

The LMK6x and the CDC6C have a number of advantages including frequency flexibility, temperature stability, power supply noise immunity and many others. Table 2-1 and Table 2-2 summarize these advantages and showcases how BAW oscillators have solved design limitations found while using quartz oscillators. Additional information can be found in the following application notes:

Table 2-1 BAW Resonator versus Quartz Resonator
Parameter Quartz BAW Advantage
Frequency Flexibility Output frequency is controlled through mechanical parameters that cannot be modified once cut. Alleviates supply constraints, single IC supports large range of frequencies through one time programming (OTP). BAW oscillator
Temperature Stability Uncompensated quartz oscillator frequency vs temperature response resembles a parabolic curve with larger ppm variation. ±10ppm (Maintains temperature stability irrelevant of temperature range.) BAW oscillator
Vibration Can be as high as +10 ppb/g. Typically does not pass MIL-STD. Typical is 1 ppb/g. Passes MIL_STD_883F Method 2002 Condition A BAW oscillator
Mechanical Shock Typically does not MIL-STD. Can fail at 2,000g. Less than 0.5ppm variation up to 1500 g. Passes MIL_STD_883F Method 2007 Condition B BAW oscillator
Table 2-2 Quartz Limitation Solved by BAW Oscillator
Parameter Quartz limitation BAW Oscillator Design
Power supply noise Typically has no integrated LDO Integrated LDO for improved power supply noise rejection (-72dBc PSRR at 500kHz, 50mV ripple)
Mean time between failure 33 million hours of operation 3.3 billion hours of operation
Frequency flexibility Limited by resonator crystal; different frequencies require different resonant crystal Support any frequency from 1MHz to 200MHz in LVCMOS variant
Supply chain Multiple third party manufacturing to support build of different components (resonator, ASIC, Package) Fabricated, assembled and packaged in house by TI
Land pattern Land pattern can depend on supplier Universal – industry standard footprint