The CDCV855 is a high-performance, low-skew, low-jitter zero delay buffer that distributes a differential clock
input pair (CLK, CLK\) to four differential pairs of clock outputs (Y[0:3], Y[0:3]\) and one differential pair of
feedback clock outputs (FBOUT, FBOUT\). When PWRDWN\ is high, the outputs switch in phase and frequency
with CLK. When PWRDWN\ is low, all outputs are disabled to a high-impedance state (3-state), and the PLL is
shut down (low-power mode). The device also enters this low-power mode when the input frequency falls below
a suggested detection frequency that is below 20 MHz (typical 10 MHz). An input frequency detection circuit
detects the low-frequency condition and after applying a >20-MHz input signal this detection circuit turns on the
PLL again and enables the outputs.
When AVDD is tied to GND, the PLL is turned off and bypassed for test purposes. The CDCV855 is also able to track spread spectrum clocking for reduced EMI.
Since the CDCV855 is based on PLL circuitry, it requires a stabilization time to achieve phase-lock of the PLL. This stabilization time is required following power up. The CDCV855 is characterized for both commercial and industrial temperature ranges.
The CDCV855 is a high-performance, low-skew, low-jitter zero delay buffer that distributes a differential clock
input pair (CLK, CLK\) to four differential pairs of clock outputs (Y[0:3], Y[0:3]\) and one differential pair of
feedback clock outputs (FBOUT, FBOUT\). When PWRDWN\ is high, the outputs switch in phase and frequency
with CLK. When PWRDWN\ is low, all outputs are disabled to a high-impedance state (3-state), and the PLL is
shut down (low-power mode). The device also enters this low-power mode when the input frequency falls below
a suggested detection frequency that is below 20 MHz (typical 10 MHz). An input frequency detection circuit
detects the low-frequency condition and after applying a >20-MHz input signal this detection circuit turns on the
PLL again and enables the outputs.
When AVDD is tied to GND, the PLL is turned off and bypassed for test purposes. The CDCV855 is also able to track spread spectrum clocking for reduced EMI.
Since the CDCV855 is based on PLL circuitry, it requires a stabilization time to achieve phase-lock of the PLL. This stabilization time is required following power up. The CDCV855 is characterized for both commercial and industrial temperature ranges.