Figure 1-1 shows the structure of the the BAW resonator technology. The structure includes a thin layer of piezoelectric film sandwiched between metal films and other layers that confine the mechanical energy. The BAW utilizes this piezoelectric transduction to generate a vibration.
The BAW oscillator can be used in factory automation applications to clock the Ethernet PHY, processor (SOC), Wifi, and USB controller as shown in Figure 1-2.
|LMK6C/D/P/H||Ultra-low jitter XO||Reference clock to Ethernet PHY, Wi-Fi®, SoC, and USB controller||1 MHz to 400 MHz, ± 25 ppm, 200 fs jitter|
|LMK1C1104||1:4 LVCMOS buffer||Fan out to clock Ethernet PHY, Wi-Fi, SoC, and USB controller in applications where all four require the same frequency||1.8 V - 3.3V supply, ultralow additive jitter of 20 fs|
|CDCE(L)9xx||Clock Generator||Supports four unique output frequencies||PCIe Gen 1-5, Automotive Grade|
The BAW oscillator has three key benefits: high-grade reliability, superb performance, and operates as a flexible solution.
The BAW oscillator provides:
The BAW oscillator supports both differential and single-ended outputs. The differential BAW oscillators (LVPECL, LVDS, and HCSL) have a typical rms jitter of 100 fs and a maximum rms jitter of 125 fs over the integration bandwidth of 12 kHz to 20 MHz. The single-ended BAW oscillator (LVCMOS) has a typical rms jitter of 200 fs and a maximum rms jitter of 500 fs.
Figure 1-7 illustrates phase noise plots for the 25 MHz variant of the BAW oscillator, which is the most commonly used frequencies in factory automation applications.
The BAW oscillator can support any frequency from 1 MHz to 400 MHz, supports LVCMOS, LVDS, LVPECL, and HCSL output formats, comes in two package sizes (3.2 mm x 2.5 mm and 2.5 mm x 2.0 mm), and supports 1.8 V. 2.5 V, and 3.3 V supply voltages.