Datasheet > SY89420

SY89420

更新时间： 2024-09-29 22:42:35

品牌	Logo	应用领域
麦瑞 - MICREL		/
页数	文件大小	规格书
8页	94K
描述
5V/3.3V DUAL PHASE LOCKED LOOP

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中文翻译

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数据手册

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SY89420 数据手册

5V/3.3V DUAL

PHASE LOCKED LOOP

ClockWorks™

SY89420V

FEATURES

DESCRIPTION

■ 3.3V and 5V power supply options

■ 1.12GHz maximum VCO frequency

The SY89420V device consists of two identical, low

jitter, digitalPhaseLockedLoopsbasedonMicrel-Synergy's

differential PLL technology. Each of the PLLs (PLLA and

PLLB) is capable of operating in the 30MHz to 560MHz

input reference frequency range independently of the other

and is configurable separately. The PLLs can be configured

to be matched in all regards, or can be configured so that

PLLB is used as a frequency doubler, while PLLA is used

to regenerate the undoubled frequency.

Two reference inputs (RINX and RINX), two feedback

inputs (FINX and FINX), two filter pins (F1X and F2X) and

two differential outputs (FOUTX and FOUTX) are provided

for each of the two PLLs. The reference and feedback

inputs can be used as either differential or single-ended

inputs. In single-ended mode RINX and FINX can be

connected to either VBB for normal 100K PECL levels or

VTH for normal TTL levels.

■ 30MHz to 560MHz reference input operating

frequency

■ Frequency doubler mode

■ Low jitter design

■ PECL differential outputs

■ PECL and TTL reference voltages available

■ External loop filter optimizes performance/cost

■ Available in 28-pin PLCC package

APPLICATIONS

■ Workstations

Feedback for the loops is realized by connecting FOUTX,

FOUTX to FINX, FINX by means of external circuitry. This

allows the user the flexibility of inserting additional circuitry

off-chip in the feedback paths, such as a divider. Pulldown

resistors are required for the FOUTX and FOUTX pins.

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.

■ Advanced communications

■ High-end consumer

■ High-performance computing

PIN CONFIGURATION

Select pins S1X and S2X are used to program the N

dividers for optimum VCO operation, in other words with

the VCO in the center of its range. Additional select pins,

S3B and S4B, are provided for PLLB. When both S3B and

S4B are low, PLLB is identical to PLLA. When S3B is high,

NB can be set to 1, 10, 18, or 20. When S4B is high, the

frequency doubler option is enabled (P = 2). All Select pins

are TTL compatible.

24 23 22 21 20 19

CCOB

S4B

FOUTB

RINB

TOP VIEW

PLCC

J28-1

FOUTA

RINA

CCOA

VBB

10 11

Rev.: K

Amendment: /0

Issue Date: May 2000

12 3 4 5 6 7 8

中文翻译

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与SY89420相关器件

型号	品牌	获取价格	描述	数据表
SY89420V	MICREL	获取价格	5V/3.3V DUAL PHASE LOCKED LOOP
SY89420VJC	MICREL	获取价格	5V/3.3V DUAL PHASE LOCKED LOOP
SY89420VJCTR	MICREL	获取价格	5V/3.3V DUAL PHASE LOCKED LOOP
SY89421V	MICREL	获取价格	5V/3.3V HIGH-PERFORMANCE PHASE LOCKED LOOP
SY89421VZC	MICREL	获取价格	5V/3.3V HIGH-PERFORMANCE PHASE LOCKED LOOP
SY89421VZCTR	MICREL	获取价格	5V/3.3V HIGH-PERFORMANCE PHASE LOCKED LOOP
SY89423V	MICREL	获取价格	5V/3.3V DUAL HIGH-PERFORMANCE PHASE LOCKED LOOP
SY89423V_07	MICREL	获取价格	5V/3.3V DUAL HIGH-PERFORMANCE
SY89423VJC	MICREL	获取价格	5V/3.3V DUAL HIGH-PERFORMANCE PHASE LOCKED LOOP
SY89423VJCTR	MICREL	获取价格	5V/3.3V DUAL HIGH-PERFORMANCE PHASE LOCKED LOOP

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