OQ2541HP/C3 データシートの表示（PDF） - Philips Electronics

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OQ2541HP/C3

SDH/SONET data and clock recovery unit STM1/4/16 OC3/12/48 GE

Philips Electronics 

Philips Semiconductors

SDH/SONET data and clock recovery unit

STM1/4/16 OC3/12/48 GE

Product specification

OQ2541HP; OQ2541U

handbook, full pagewidth

BAND GAP

REFERENCE

100 nF VEE

PC

2Ω

β > 100

GND

on chip

off chip

1 kΩ

R1 1

2 Ω kΩ

3.3

nF

1 µF

L1(1)

−4.5 V

MGL732

(1) L1 = RF choke type Murata BLM21 or equivalent.

Fig.6 Schematic diagram of OQ2541 power control loop.

handbook, halfpage

500 Ω

16 kΩ

on chip

GND

AREF VAREF

RAREF

VEE

off chip

MGL667

Fig.7 Functionality of pin AREF.

If the outputs are AC-coupled, the formulae for calculating

the required voltage on pin AREF and the value of the

resistor connected between pins AREF and VEE as

follows:

VAREF = –R-----L--R--+---L--R-----o × 0.5Vswing

(1)

and:

R

1

×







V----V-A---ER---E-E---F-

–



1



RAREF

=

----------------------------------------------------------------

1

–







RR-----12--

×







V----V-A---ER---E-E---F-

–



1









(2)

where R1 = 500 Ω, R2 = 16 kΩ and VEE = −3.3 V.

To maintain a single-ended swing of 200 mV (p-p) across

a 50 Ω AC-coupled load, the voltage on pin AREF must be

–100 mV × -(---5---0-----5+---0---1--Ω-0---0----)---Ω--- = –300 mV

This can be achieved by connecting a 7.3 kΩ resistor

between pins AREF and VEE.

1999 May 27

8

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