82V3285AEQG集成電路（IC）的應(yīng)用特定時(shí)鐘/定時(shí)規(guī)格書(shū)PDF中文資料

FEATURES

HIGHLIGHTS

? The first single PLL chip:

? Features 0.5 mHz to 560 Hz bandwidth

? Exceeds GR-253-CORE (OC-12) and ITU-T G.813 (STM-16/

Option I) jitter generation requirements

? Provides node clocks for Cellular and WLL base-station (GSM

and 3G networks)

? Provides clocks for DSL access concentrators (DSLAM), especially

for Japan TCM-ISDN network timing based ADSL equipments

MAIN FEATURES

? Provides an integrated single-chip solution for Synchronous Equipment

Timing Source, including Stratum 2, 3E, 3, SMC, 4E and 4

clocks

? Employs DPLL and APLL to feature excellent jitter performance

and minimize the number of the external components

? Integrates T0 DPLL and T4 DPLL; T4 DPLL locks independently or

locks to T0 DPLL

? Supports Forced or Automatic operating mode switch controlled by

an internal state machine; the primary operating modes are Free-

Run, Locked and Holdover

? Supports programmable DPLL bandwidth (0.5 mHz to 560 Hz in 19

steps) and damping factor (1.2 to 20 in 5 steps)

? Supports 1.1X10-5 ppm absolute holdover accuracy and 4.4X10-8

ppm instantaneous holdover accuracy

? Supports PBO to minimize phase transients on T0 DPLL output to

be no more than 0.61 ns

? Supports phase absorption when phase-time changes on T0

selected input clock are greater than a programmable limit over an

interval of less than 0.1 seconds

? Supports programmable input-to-output phase offset adjustment

? Limits the phase and frequency offset of the outputs

? Supports manual and automatic selected input clock switch