M685-01-BA-BH Integrated Circuit System, M685-01-BA-BH Datasheet

M685-01-BA-BH

Manufacturer Part Number

M685-01-BA-BH

Description

DUAL SAW, Selectable Frequency VCSO

Manufacturer

Integrated Circuit System

Datasheet

1.M685-01-BA-BH.pdf (7 pages)

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The M685 is a dual SAW, selectable frequency VCSO

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).

◆ Two integrated SAW devices and selectable output

◆ M685-01 output frequencies from 125 to 175 MHz

◆ Industry-standard Kvco for full compatibility

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

◆ Differential 3.3V LVPECL output

◆ Single 3.3V power supply

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

M685 Datasheet Rev 0.4

I n t e g r a t e d C i r c u i t S y s t e m s , I n c .

EATURES

frequency; supports multi-rate optical interfaces

M685-02 output frequencies from 500 to 700 MHz

(Specify center frequencies at time of order)

(50kHz to 80MHz)

LOCK

ENERAL

M685 Dual SAW, Selectable Frequency VCSO

Integrated

Circuit

Systems, Inc.

IAGRAM

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

ESCRIPTION

F_SEL

VIN

M680

M685

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

●

N e t w o r k i n g & C o m m u n i c a t i o n s

Figure 2: Block Diagram

VCSO

SAW Delay Line

Sample of Available Output Frequencies

Note 1: Specify VCSO center frequencies at time of order

UAL

155.5200, 167.3316

156.2500, 161.1328

622.0800, 669.3266

625.0000, 644.5313

Frequencies

Phase

Shifter

Phase

Shifter

VCSO Center

SAW, S

SSIGNMENT

●

(MHz)

w w w. i c s t . c o m

ELECTABLE

Figure 1: Pin Assignment

Table 1: Sample of Available Output Frequencies

( To p Vi ew)

(5 x 7.5mm SMT)

M685

M680

SONET/SDH, SONET/SDH FEC

Gigabit Ethernet, GbE FEC

●

REQUENCY

Applications

t e l ( 5 0 8 ) 8 5 2 - 5 4 0 0

Revised 16Nov2004

FOUT

nFOUT

M685

VCSO

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