SBAA653 October   2024 ADC3641 , ADC3642 , ADC3643 , ADC3661 , ADC3662 , ADC3663 , ADC3681 , ADC3682 , ADC3683 , LMK04368-EP , LMK04832 , LMK04832-SEP , LMK04832-SP , LMX1204 , LMX1860-SEP , LMX1906-SP , LMX2571 , LMX2571-EP , LMX2572 , LMX2572LP , LMX2594 , LMX2595 , LMX2615-SP , LMX2694-EP , LMX2694-SEP , LMX2820

 

  1.   1
  2.   Abstract
  3.   Trademarks
  4. 1Introduction
  5. 2Understanding the Difference Between Phase Noise and Jitter
  6. 3Understanding How Phase Noise or Jitter can Affect the ADC Performance
  7. 4Understanding Clocking Tradeoffs and What this Means to an ADC Performance
  8. 5Understanding How to Apply Clocking Tradeoffs to Achieve the Desired ADC Performance
  9. 6Summary
  10. 7References
  11.   Appendix A: Choosing a TI Clock Device Based on the TI High-Speed Converter Used

Appendix A: Choosing a TI Clock Device Based on the TI High-Speed Converter Used

TI clocking portfolio ranges from a variety of parts that offer low power, low phase noise/jitter, and low cost. However, there are design tradeoffs to achieve the best performance, power, and cost on a single clocking device. High performing devices tend to draw more current and be more expensive, while lower power devices tend to be cheaper but not as high performing. Because of these trade-offs and ample clocking and high-speed converter portfolios, TI created Table 8-1 to guide you in selecting a clock for the high-speed converter your using. Keep in mind that these are general recommendations and the best clock device can vary depending on your specific application requirements. For personalized support, please post your application requirements on E2E.

Table 8-1 TI High-Speed Converter and TI Clock Pairings
High Speed Converter Overall Best Clock Pairing Clock Pairing Tradeoff by Priority (only for clock generation)
Clock generation Clock distribution Lowest Cost Highest Performance Lowest Power Tradeoffs/Comments
ADC12xJ3200 When clocking or synchronizing multiple ADCs: LMK04832

When clocking or synchronizing single ADC: LMX2594		 LMK04832 LMX2820 LMX2594 LMK04832: higher power, bigger part, and has 14 total outputs

LMX2594: more expensive but lower power, smaller part
ADC12xJ2700
ADC12xJ1600
ADC09xJ1300
ADC09xJ800
ADC12DJ5200RF LMX2820 or LMX2594 LMX1204 LMX2594 LMX2820 LMX2594 LMX2594/LMX2820 + LMX1204 can be paired to create multiple copies of CLK and SYSREF at higher sampling frequencies
ADC35xx/ADC36xx For frequencies < 328MHz: CDCE6214

For frequencies between 328MHz and 400MHz: LMK3H0102

For frequencies between 400MHz and 500MHz: CDCM6208		 CDCE6214 LMK04832 CDCE6214 CDCE6214: cheapest, small (4mm x 4mm) and lowest power (about 50mA) but can only output up to 328MHz

LMK3H0102: smallest (3mm x 3mm), newer part, but second highest power (about 90mA)

CDCM6208: third highest power (about 115mA), but versatile part and can output up to 800MHz

LMK04832: highest power (about 350mA) and biggest size (9mm x 9mm) but results in best performance (about 10x better than other 3 parts)
AFE79xx LMX2820 or LMX2594 LMX1204 LMX2594 LMX2820 LMX2594 LMX2594 can be good enough for some applications and overall better clock pairing, but if performance is of utmost importance then the LMX2820 needs to be used (with an external VCO to achieve the absolute best performance)
ADC3xRF5x/7x LMX2820 in external VCO mode LMX2820 in external VCO mode
AFE8000 LMX2820 or LMX2594 LMX2820
DAC39RF10 LMX2820 or LMX2594
ADC39xx (8-bit) LMK6P CDC6C LMK6P CDC6C LMK6P: best performance but slightly bigger (2.5mm x 2mm) and higher power (about 90mA)

CDC6C: smaller (1.2mm x 1.6mm) and lower power (about 6mA) but worse performance
ADC39xx (10-bit) CDCE6214 LMK3H0102 CDCE6214 CDCE6214 ** Same tradeoffs as the ADC35xx/ADC36xx family
ADC3669 LMX2571 CDCE6214 LMX2571 CDCE6214 LMX2571: better performance, comparable in power (about 55mA) and bigger (6mm x 6mm)

CDCE6214: cheaper, smaller (4mm x 4mm), and slightly lower power (about 50mA) but worse performance