[Figure 1, callout 40]
The VMK180 board has an I2C programmable SI570 low-jitter 1.8V CMOS single-ended oscillator (U32). The 33.333 MHz REF_CLK clock signals is connected to XCVM1802 device U1 configuration bank 503 pin AE32. At power-up, this clock defaults to an output frequency of 33.333 MHz. User applications or the System Controller can change the output frequency within the range of 10 MHz to 945 MHz through the I2C bus interface. Power cycling the VMK180 board reverts this user clock to the default frequency of 33.333 MHz.
- Programmable oscillator: Silicon Labs SI570JAC000900DG (10 MHz-945 MHz range, 33.333 MHz default)
- I2C address
0x5D - CMOS single-ended output, total stability: 61.5 ppm