GENERAL DESCRIPTION

The AD9558 is a low loop bandwidth clock multiplier that provides jitter cleanup and synchronization for many systems, including synchronous optical networks (SONET/SDH). The AD9558 generates an output clock synchronized to up to four external input references. The digital PLL allows for reduction of input time jitter or phase noise associated with the external references. The digitally controlled loop and holdover circuitry of the AD9558 continuously generates a low jitter output clock even when all reference inputs have failed.

The AD9558 operates over an industrial temperature range of ?40°C to +85°C. If a smaller package is required, refer to the AD9557 for the two-input/two-output version of the same part.

FEATURES

Supports GR-1244 Stratum 3 stability in holdover mode

Supports smooth reference switchover with virtually no disturbance on output phase

Supports Telcordia GR-253 jitter generation, transfer, and tolerance for SONET/SDH up to OC-192 systems

Supports ITU-T G.8262 synchronous Ethernet slave clocks

Supports ITU-T G.823, G.824, G.825, and G.8261

Auto/manual holdover and reference switchover

4 reference inputs (single-ended or differential)

Input reference frequencies: 2 kHz to 1250 MHz

Reference validation and frequency monitoring (1 ppm)

Programmable input reference switchover priority

20-bit programmable input reference divider

6 pairs of clock output pins with each pair configurable as a single differential LVDS/HSTL output or as 2 single-ended CMOS outputs

Output frequencies: 352 Hz to 1250 MHz

Programmable 17-bit integer and 24-bit fractional feedback divider in digital PLL

Programmable digital loop filter covering loop bandwidths from 0.1 Hz to 5 kHz (2 kHz maximum for <0.1 dB of peaking)

Low noise system clock multiplier

Frame sync support

Adaptive clocking

Optional crystal resonator for system clock input

On-chip EEPROM to store multiple power-up profiles

Pin program function for easy frequency translation configuration

Software controlled power-down

64-lead, 9 mm × 9 mm, LFCSP package

APPLICATIONS

Network synchronization, including synchronous Ethernet and SDH to OTN mapping/demapping

Cleanup of reference clock jitter

SONET/SDH clocks up to OC-192, including FEC

Stratum 3 holdover, jitter cleanup, and phase transient control

Wireless base station controllers

Cable infrastructure

Data communications

AD9558屬于集成電路（IC） > 應用特定時鐘/定時。亞德諾半導體技術有限公司制造生產(chǎn)的AD9558應用特定時鐘/定時專用時鐘和計時 IC（集成電路）產(chǎn)品族中的產(chǎn)品主要用于執(zhí)行與時間或頻率信息生成和分配相關的各種操作，適合的設計環(huán)境較特定，例如 AMD 和 Intel 的中央處理單元 (CPU) 或圖形處理單元 (GPU)、DVD 音頻設備、藍光光盤播放器、以太網(wǎng)設備、PCIe、SATA、光纖通道接口、車載娛樂總線等。