ACS8947T datasheet(1/30 Pages) SEMTECH

Part #	ACS8947T

Description	Jitter Attenuating, Multiplying Phase-Locked Loop with Automatic Input Switch and Data Resynchronization Path

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Revision 1.00/September 2007© Semtech Corp.

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ACS8947T JAM PLL

ADVANCED COMMUNICATIONS

FINAL

Jitter Attenuating, Multiplying Phase-Locked Loop with

Automatic Input Switch and Data Resynchronization Path

ADVANCED COMMS & SENSING

FINAL

DATASHEET

The ACS8947T JAM PLL is a general pupose, Integer N,

jitter-attenuating, differential phase-locked loop for

generating low jitter output clocks. Frequency translation,

reference switching between clock inputs and

resynchronization features are provided also. Typical

application areas include Ethernet, SONET/SDH, PCI, 3G

and wireless systems.

Typical output jitter generation in a SONET/SDH OC-12

system is 2.8 ps RMS, making the ACS8947T an ideal

dejittering solution for use with Semtech clock and line

card parts ACS8510, ACS8520, ACS8525, ACS8522,

ACS8530 and ACS9510.

The ACS8947T has two differential frequency-

programmable LVPECL reference inputs and one

differential synchronization input. The device is capable of

locking across a wide input frequency range of 580 kHz to

180 MHz. Four independently-supplied differential

outputs are available, programmable as LVPECL or CML.

Each output supports a maximum output frequency rate

of up to 625 MHz. All device settings are fully hardwire

configured. An external microprocessor is not required to

program the PLL.

Highly configurable high performance Integer N PLL

with integrated VCO.

VCO frequency range 2.35 GHz to 2.9 GHz.

Configurable closed loop bandwidth from 2 kHz

upwards.

PLL fully configured by hardwired configuration matrix:

no requirement for an external microprocessor.

Full control over internal dividers allows the device to

be configured for a wide range of frequency

translation and jitter cleaning applications.

Meets RMS jitter requirements for OC3 and OC12

telecommunications systems.

Wide input frequency range of 580 kHz to 180 MHz.

Wide output frequency range of 1.23 MHz to

625 MHz.

Input activity monitors and lock detector.

Automatic or manual control of reference selection.

External feedback option.

Wide tracking range of 200 ppm.

Powerful evaluation board and GUI tool for

configuration and device assessment.

3.3 V operation: temperature range - 40°C to +85°C.

Small outline, leadless, 7 mm x 7 mm QFN48

package.

Figure 1 Simplified Block Diagram of the ACS8947T JAM PLL

Block Diagram

Introduction

Features

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