Datasheet > M685-02-AB-AD

M685-02-AB-AD

更新时间： 2024-11-08 22:30:35

品牌	Logo	应用领域
矽成 - ICSI		/
页数	文件大小	规格书
7页	271K
描述
DUAL SAW, SELECTABLE FREQUENCY VCSO

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M685-02-AB-AD 数据手册

P r e l i m i n a r y I n f o r m a t i o n

Integrated

Circuit

Systems, Inc.

M685

DUAL SAW, SELECTABLE FREQUENCY VCSO

GENERAL DESCRIPTION

PIN ASSIGNMENT (5 x 7.5mm SMT)

The M685 is a dual SAW, selectable frequency VCSO

frequency source for low-jitter clock

generation. An integrated SAW (surface

acoustic wave) delay line implements the

high-Q VCO (voltage controlled oscillator)

function, which results in low output phase

M685

M680

(Top View)

noise and very low jitter. The M685-01 is available in

a range of center frequencies from 125 to 175 MHz.

The M685-02 provides 500 to 700 MHz. Guaranteed

minimum pull-range of ±120 ppm meets GbE

requirements. (It also fully satisfies ±50 ppm minimum

pull-range specification commonly required.) Industry-

standard Kvco (VCO Gain) provides full replacement

compatibility. The M685 is well suited for phase-locked

loop implementations, clock and data recovery circuits,

and other timing applications in telecom and optical

fiber networking systems (e.g., OC-48).

Figure 1: Pin Assignment

Sample of Available Output Frequencies

VCSO Center

Applications

Frequencies¹(MHz)

FEATURES

◆ Two integrated SAW devices and selectable output

155.5200, 167.3316

156.2500, 161.1328

622.0800, 669.3266

625.0000, 644.5313

SONET/SDH, SONET/SDH FEC

Gigabit Ethernet, GbE FEC

frequency; supports multi-rate optical interfaces

◆ M685-01 output frequencies from 125 to 175 MHz

M685-02 output frequencies from 500 to 700 MHz

(Specify center frequencies at time of order)

SONET/SDH, SONET/SDH FEC

Gigabit Ethernet, GbE FEC

◆ Industry-standard Kvco for full compatibility

◆ Low phase jitter 0.2ps rms typical for the M685-02

(50kHz to 80MHz)

Table 1: Sample of Available Output Frequencies

Note 1: Specify VCSO center frequencies at time of order

◆ Differential 3.3V LVPECL output

◆ Single 3.3V power supply

◆ Small 5 x 7.5mm SMT (surface mount) package

BLOCK DIAGRAM

M680

M685

SAW Delay Line

Phase

Shifter

VCSO

FOUT

VIN

nFOUT

SAW Delay Line

Phase

VCSO

Shifter

F_SEL

Figure 2: Block Diagram

M685 Datasheet Rev 0.4

Revised 16Nov2004

M685 Dual SAW, Selectable Frequency VCSO

Integrated Circuit Systems, Inc. ● Networking & Communications ● www.icst.com ● tel (508) 852-5400

12 3 4 5 6 7

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