LUCL8560EP-D データシートの表示（PDF） - Agere -> LSI Corporation

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LUCL8560EP-D

Low-Power SLIC with Ringing

Agere -> LSI Corporation 

L8560 Low-Power SLIC with Ringing

Data Sheet

April 2000

Applications (continued)

Design Examples (continued)

Receive Gain

Ratios of RRCV, RT3, RGP will set both the low-frequency

termination and receive gain for the complex case. In

the complex case, additional high-frequency compen-

sation, via CN, RN1, and RN2, is needed for the return

loss characteristic. For resistive termination, CN, RN1,

and RN2 are not used and RCVN is tied to ground via a

resistor.

Determine the receive gain, gRCV, taking into account

the impedance transformation in a manner similar to

transmit gain.

RX (dB) = RX (specified[dB]) + 20 log R-----E---Q--

600

RX (dB) = 20 log gRCV

Then:

gRCV

=

-----------------------4------------------------

1

+

-R-----R---C----V--

RT3

+

R------R---C----V--

RGP

and low-frequency termination

ZTER(low) =

----------------3---2----0----0-----------------

1

+

-R-----T----3-

RGP

+

---R-----T---3----

RRCV

+ 2RP

ZTER(low) is the specified termination impedance assum-

ing low frequency (C or C´ is open).

RP is the series protection resistor.

These two equations are best solved using a computer

spreadsheet.

Next, solve for the high-frequency return loss compen-

sation circuit, CN, RN1, and RN2:

CNRN2 = --2---R-----P-- CG RTGP

3200

RN1 = RN2

3----2---0---0--

2RP





R-R----TT---GG----SP-

–

1

There is an input offset voltage associated with nodes

RCVN and RCVP. To minimize the effect of mismatch of

this voltage at T/R, the equivalent resistance to ac

ground at RCVN should be approximately equal to that

at RCVP. Refer to Figure 40 on page 43 (with dc block-

ing capacitors). To meet this requirement, RN2 = RGP ||

RT3.

Hybrid Balance

Set the hybrid cancellation via RHB.

RHB =

------------R-----X-------------

gRCV × gTX

42

Lucent Technologies Inc.

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