CDCF2510

3.3V PHASELOCK LOOP CLOCK DRIVER

SCAS628D − APRIL 1999 − REVISED DECEMBER 2004

3

POST OFFICE BOX 655303

Terminal Functions

TERMINAL

TYPE

DESCRIPTION

NAME

NO.

TYPE

DESCRIPTION

CLK

24

I

Clock input. CLK provides the clock signal to be distributed by the CDCF2510 clock driver. CLK is used

to provide the reference signal to the integrated PLL that generates the clock output signals. CLK must

have a fixed frequency and fixed phase for the PLL to obtain phase lock. Once the circuit is powered

up and a valid CLK signal is applied, a stabilization time is required for the PLL to phase lock the

feedback signal to its reference signal.

FBIN

13

I

Feedback input. FBIN provides the feedback signal to the internal PLL. FBIN must be hard-wired to

FBOUT to complete the PLL. The integrated PLL synchronizes CLK and FBIN so that there is nominally

zero phase error between CLK and FBIN.

G

11

I

Output bank enable. G is the output enable for outputs 1Y(0:9). When G is low, outputs 1Y(0:9) are

disabled to a logic-low state. When G is high, all outputs 1Y(0:9) are enabled and switch at the same

frequency as CLK.

FBOUT

12

O

Feedback output. FBOUT is dedicated for external feedback. It switches at the same frequency as CLK.

When externally wired to FBIN, FBOUT completes the feedback loop of the PLL. FBOUT has an

integrated 25-

Ω series-damping resistor.

1Y (0:9)

3, 4, 5, 8, 9,

15, 16, 17, 20,

21

O

Clock outputs. These outputs provide low-skew copies of CLK. Output bank 1Y(0:9) is enabled via the

G input. These outputs can be disabled to a logic-low state by deasserting the G control input. Each

output has an integrated 25-

Ω series-damping resistor.

AVCC

23

Power

Analog power supply. AVCC provides the power reference for the analog circuitry. In addition, AVCC can

be used to bypass the PLL for test purposes. When AVCC is strapped to ground, PLL is bypassed and

CLK is buffered directly to the device outputs.

AGND

1

Ground

Analog ground. AGND provides the ground reference for the analog circuitry.

VCC

2, 10, 14, 22

Power

Power supply

GND

6, 7, 18, 19

Ground

Ground