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AD9551BCPZ-REEL7

更新时间： 2024-02-03 11:52:25

品牌	Logo	应用领域
亚德诺 - ADI		晶体时钟发生器微控制器和处理器外围集成电路
页数	文件大小	规格书
40页	793K
描述
Multiservice Clock Generator

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技术参数
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AD9551BCPZ-REEL7 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Obsolete	零件包装代码：	QFN
包装说明：	HVQCCN,	针数：	40
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.39.00.01	风险等级：	5.77
JESD-30 代码：	S-XQCC-N40	JESD-609代码：	e3
长度：	6 mm	湿度敏感等级：	1
端子数量：	40	最高工作温度：	85 °C
最低工作温度：	-40 °C	最大输出时钟频率：	900 MHz
封装主体材料：	UNSPECIFIED	封装代码：	HVQCCN
封装形状：	SQUARE	封装形式：	CHIP CARRIER, HEAT SINK/SLUG, VERY THIN PROFILE
峰值回流温度（摄氏度）：	225	主时钟/晶体标称频率：	806 MHz
认证状态：	Not Qualified	座面最大高度：	1 mm
标称供电电压：	3.3 V	表面贴装：	YES
技术：	CMOS	温度等级：	INDUSTRIAL
端子面层：	MATTE TIN	端子形式：	NO LEAD
端子节距：	0.5 mm	端子位置：	QUAD
处于峰值回流温度下的最长时间：	NOT SPECIFIED	宽度：	6 mm
uPs/uCs/外围集成电路类型：	CLOCK GENERATOR, OTHER	Base Number Matches：	1

AD9551BCPZ-REEL7 数据手册

Multiservice Clock Generator

AD9551

Reference conditioning and switchover circuitry internally

synchronizes the two references so that if one reference fails,

there is virtually no phase perturbation at the output.

FEATURES

Translation between any two standard network rates

Dual reference inputs and dual clock outputs

Pin programmable for standard network rate translation

SPI programmable for arbitrary rational rate translation

Output frequencies from 10 MHz to 900 MHz

Input frequencies from 19.44 MHz to 806 MHz

On-chip VCO

Meets OC-192 high band jitter generation requirement

Supports standard forward error correction (FEC) rates

Supports holdover operation

The AD9551 uses an external crystal and an internal DCXO to

provide for holdover operation. If both references fail, the device

maintains a steady output signal.

The AD9551 provides pin-selectable, preset divider values for

standard (and FEC adjusted) network frequencies. The pin-

selectable frequencies include any combination of 15 possible

input frequencies and 16 possible output frequencies. A SPI

interface provides further flexibility by making it possible to

program almost any rational input/output frequency ratio.

Supports hitless switchover and phase build-out (even with

unequal reference frequencies)

The AD9551 is a clock generator that employs fractional-N-based

phase-locked loops (PLL) using sigma-delta (Σ-Δ) modulators

(SDMs). The fractional frequency synthesis capability enables

the device to meet the frequency and feature requirements for

multiservice switch applications. The AD9551 precisely generates

a wide range of standard frequencies when using any one of those

same standard frequencies as a timing base (reference). The

primary challenge of this function is the precise generation of the

desired output frequency because even a slight output frequency

error can cause problems for downstream clocking circuits in

the form of bit or cycle slips. The requirement for exact frequency

translation in such applications necessitates the use of a frac-

tional-N-based PLL architecture with variable modulus.

SPI-compatible 3-wire programming interface

Single supply (3.3 V)

APPLICATIONS

Multiservice switches

Multiservice routers

Exact network clock frequency translation

General-purpose frequency translation

GENERAL DESCRIPTION

The AD9551 accepts one or two reference input signals to synthe-

size one or two output signals. The AD9551 uses a fractional-N

PLL that precisely translates the reference frequency to the desired

output frequency. The input receivers and output drivers provide

both single-ended and differential operation.

BASIC BLOCK DIAGRAM

CRYSTAL

(26MHz)

REFERENCE

CONDITIONING

AND SWITCH-

OVER

OUT1

OUT2

REFA

REFB

HOLDOVER

LOOP

OUTPUT

CIRCUITRY

PLL

PIN-DEFINED AND SERIAL

PROGRAMMING

AD9551

Figure 1.

Rev. B

Information furnished by Analog Devices is believed to be accurate and reliable. However, no

responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other

rights of third parties that may result from its use. Specifications subject to change without notice. No

license is granted by implication or otherwise under any patent or patent rights of Analog Devices.

Trademarks and registeredtrademarks arethe property of their respective owners.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A.

Tel: 781.329.4700

Fax: 781.461.3113

www.analog.com

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