zl30414 Zarlink Semiconductor, zl30414 Datasheet - Page 5

• Manufacturer Part Number: zl30414
• Description: Sonet/sdh Clock Multiplier Pll
• Manufacturer: Zarlink Semiconductor

1.0
The ZL30414 is an analog phased-locked loop which provides rate conversion and jitter attenuation for
SONET/SDH OC-192/STM-64, OC-48/STM-16, OC-12/STM-4 and OC-3/STM-1 applications. A functional block
diagram of the ZL30414 is shown in Figure 1 and a brief description is presented in the following sections.
1.1
The Frequency/Phase Detector compares the frequency/phase of the input reference signal with the feedback
signal from the Frequency Divider circuit and provides an error signal corresponding to the frequency/phase
difference between the two. This error signal is passed to the Loop Filter circuit.
1.2
The ZL30414 has a built-in LOCK detector that measures frequency difference between input reference clock C19i
and the VCO frequency. When the VCO frequency is less than ±300 ppm apart from the input reference frequency
then the LOCK pin is set high. The LOCK pin is pulled low if the frequency difference exceeds ±1000 ppm.
1.3
The Loop Filter is a low pass filter. This low pass filter ensures that the network jitter requirements are met for an
input reference frequency of 19.44 MHz. The corner frequency of the Loop Filter is configurable with an external
capacitor and resistor connected to the LPF pin and ground as shown in Figure 3.
Pin Description Table (continued)
Pin #
60
61
62
63
64
65
Frequency/Phase Detector
Lock Indicator
Loop Filter
Functional Description
C622oP-A
C622oN-A
Name
GND
GND
VCC
NC
Frequency
and Phase
Detector
VCO
Ground. 0 volt
Positive Analog Power Supply. +3.3 V ±10%.
C622 Clock Output (LVPECL). These outputs provide a differential LVPECL
clock at 622.08 MHz. Unused LVPECL port should be left unterminated to
decrease supply current.
Ground. 0 volt
No internal bonding Connection. Leave unconnected.
ZL30414
Loop
Filter
Figure 3 - Loop Filter Elements
Zarlink Semiconductor Inc.
ZL30414
LPF
5
R
C
F
F
Description
R
F
=8.2 k:C
F
=470 nF
Data Sheet