Multirate CDR with Integrated Serializer/Deserializer

for GPON and BPON ONT Applications

10

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SDI+

SDI-

FREQ

DETECT

CDR PLL

OSC

RFCK1

RFCK2

LOCK

CFIL

MVCO

D

CLK

CLK/4

4-BIT SERIAL

TO PARALLEL

DIV 2

PCKO+

PCKO-

MDDR

REGISTER

PCKI+

PCKI-

5 x 4 FIFO

1

0

RCKO+

MSYM

Q

D

D

D

D

4-BIT

PARALLEL

TO SERIAL

WR

SDO+

RCKO-

SDO-

BENO+

BENO-

RD

FERR

FRST

CLK

CLK

1

0

DIV 4

Q

PDO3+

PDO3-

LVDS

Q

PDO2+

PDO2-

LVDS

Q

PDO1+

PDO1-

LVDS

Q

PDO0+

PDO0-

LVDS

LVDS

LVDS

PDI3+

PDI3-

LVDS

PDI2+

PDI2-

LVDS

PDI1+

PDI1-

LVDS

PDI0+

PDI0-

LVDS

BENI+

BENI-

LVDS

CMOS

CMOS

CMOS

CMOS

D

D

Q

CLK

VCO

LPF

PD

CML

CMOS

CMOS

DIV 2,

DIV 4

LVDS

CML

Q

CLK

CML

MAX3886

Figure 4. Functional Diagram