JAJSSL4A December 2023 – September 2024 LMX1214
PRODUCTION DATA
The windowing feature can be used to internally calibrate the timing between the SYNC and CLKIN pins to optimize setup and hold timing and trim out any mismatches between the SYNC and CLKIN paths. This feature requires that the timing from the SYNC rising edge to the CLKIN rising edge is consistent. The timing from the SYNC rising edge to the CLKIN rising edges can be tracked with the rb_CLKPOS field. After the timing to the rising edge of the CLKIN pin is found, the SYNC rising edge can be internally adjusted with the SYNC_DLY and SYNC_DLY_STEP fields to optimize setup and hold times.
INPUT FREQUENCY | RECOMMENDED SYNC_DLY_STEP | DELAY (ps) |
---|---|---|
1.4 GHz < fCLKIN ≤ 2.7 GHz | 0 | 28 |
2.4 GHz < fCLKIN ≤ 4.7 GHz | 1 | 15 |
3.1 GHz < fCLKIN ≤ 5.7 GHz | 2 | 11 |
fCLKIN ≥ 4.5 GHz | 3 | 8 |
For the windowing feature:
For SYNC operation: