M685-02-AA-AH IDT, Integrated Device Technology Inc, M685-02-AA-AH Datasheet

M685-02-AA-AH

Manufacturer Part Number

M685-02-AA-AH

Description

Manufacturer

IDT, Integrated Device Technology Inc

Datasheet

1.M685-02-AA-AH.pdf (7 pages)

Specifications of M685-02-AA-AH

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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

Related parts for M685-02-AA-AH

M685-02-AA-AH Summary of contents

Page 1

... 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) ◆ Industry-standard Kvco for full compatibility ◆ Low phase jitter 0.2ps rms typical for the M685-02 (50kHz to 80MHz) ◆ Differential 3.3V LVPECL output ◆ Single 3.3V power supply ◆ ...

Page 2

... Input 1 VIN Input 2 F_SEL 3 GND Ground 4 FOUT Output 5 nFOUT 6 VCC Power Note 1: See “Frequency Select” in Table 5 (DC Characteristics for M685-01 on pg. 3) and Table 7 (DC Characteristics for M685-02 on pg. 4). ATINGS BSOLUTE AXIMUM Symbol Parameter V Inputs I V Outputs O V Power Supply Voltage CC ...

Page 3

... At any givin V 0 Best fit straight line 0.3 ppm/V 400 -77 dBc -48 dBc/Hz -75 dBc/Hz -99 dBc/Hz -124 dBc/Hz -142 dBc/Hz 0.30 ps rms 0.18 ps rms 275 425 275 425 20 Table 6: AC Characteristics for M685-01 Revised 16Nov2004 ● ● M685 VCSO IN 3 ...

Page 4

... At any givin V 0 Best fit straight line 0.3 ppm/V 400 -77 dBc -42 dBc/Hz -72 dBc/Hz -102 dBc/Hz -127 dBc/Hz -146 dBc/Hz 0.22 ps rms 0.16 ps rms 275 400 275 400 20 Table 8: AC Characteristics for M685-02 Revised 16Nov2004 ● ● M685 VCSO IN 3 ...

Page 5

... SMT (Surface Mount) Package EVICE ACKAGE Mechanical Dimensions: ICSM685 -02-AA-AH Dimensions are in mm; dimensions are in inches Unless otherwise specified, all dimensions are ±0.13 [0.005] Figure 5: Device Package - 5 x 7.5mm SMT (Surface Mount) Package M685 Datasheet Rev 0 UAL I NFORMATION Output Duty Cycle nFOUT V P-P 20% ...

Page 6

... Table 10: M685-01 Standard Output Frequencies & Order Codes M685-02 Standard Output Frequencies & Order Codes 614.4000 Order Part Number 622.0800 M685-0y-xx-xx 625.0000 M685-01-BA-BH 627.3296 M685-01-BB-BD 644.5313 M685-02-AA-AH 657.4219 M685-02-AB-AD 666.5143 Table 11: M685-02 Standard Output Frequencies & Order Codes & ● M685 SAW ...

Page 7

... F_SEL Change During Power-Up Can Affect Output Frequency Accuracy The M685 features an input which is used to select the internal VCSO frequency. F_SEL The input logic level should not be changed while the M685 device is in operation (that is, voltage F_SEL is applied to the pin ), particularly when the pin VCC Changing the input logic level during operation may result in an erroneous output frequency ...

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