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SY89421VZC

更新时间： 2024-09-29 22:10:35

品牌	Logo	应用领域
麦瑞 - MICREL		光电二极管
页数	文件大小	规格书
8页	84K
描述
5V/3.3V HIGH-PERFORMANCE PHASE LOCKED LOOP

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中文翻译

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数据手册

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SY89421VZC 数据手册

5V/3.3V

HIGH-PERFORMANCE

PHASE LOCKED LOOP

ClockWorks™

SY89421V

FEATURES

DESCRIPTION

■ 3.3V and 5V power supply options

■ 1.12GHz maximum VCO frequency

The SY89421V is a digital Phase Locked Loop based on

Micrel-Synergy's differential PLL technology. It is capable

of operating in the 30MHz to 560MHz reference input

frequency range, and up to 2000MHz with the HFIN input

and an external VCO. Use of a phase-frequency detector

results in excellent PLL locking and tracking characteristics.

Error correction voltages are generated by the detector if

either phase or frequency deviations occur. The VCO has

a frequency range covering more than a 2:1 ratio from

480MHz to 1120MHz.

Feedback for the loop is realized by connecting FOUT,

FOUT to FIN, FIN by means of external circuitry. This

allows the flexibility of inserting additional circuitry off-chip

in the feedback paths, such as an additional divider and/or

buffer. Pulldown resistors are required for the FOUT and

FOUT pins. High frequency inputs HFIN, HFIN and

corresponding outputs HFOUT, HFOUT are featured for

use with external components such as an active loop filter

and a high frequency VCO.

Select pins S1 and S2 are used to program the N divider

for optimum VCO operation, in other words with the VCO in

the center of its range. Select pin S3 allows bypassing the

N divider enabling the PLL to output the VCO directly.

Select pin S4 is used to select off-chip or on-chip VCO.

Select pin S5 enables the divide-by-two prescaler, which is

useful in frequency doubling applications. All Select pins

are TTL compatible.

■ 30MHz to 560MHz reference input operating

frequency

■ External 2.0GHz VCO capability

■ Low jitter differential design

■ Frequency doubler mode

■ PECL Differential output

■ External loop filter optimizes performance/cost

■ Available in 20-pin SOIC package

APPLICATIONS

■ Workstations

■ Advanced communications

■ High-performance computing

PIN CONFIGURATION

FIN

RIN

VEE

17 S3

VCC

TOP VIEW

SOIC

Z20-1

FOUT

14 FOUT

HFIN

VCCO

HFOUT

S4 10

11 HFOUT

Rev.: F

Amendment: /0

Issue Date: May 2000

12 3 4 5 6 7 8

中文翻译

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