L9310 datasheet(47/60 Pages) AGERE

Part #	L9310

Description	Line Interface and Line Access Circuit Full-Feature SLIC,Ringing Relay,and Test Access Device

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Manufacturer	AGERE [Agere Systems]

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47 / 60 page

Data Sheet

July 2001

Full-Feature SLIC, Ringing Relay, and Test Access Device

L9310 Line Interface and Line Access Circuit

Agere Systems Inc.

47

ac Applications (continued)

First-Generation Codec ac Interface Network: Resistive Termination (continued)

Example 1, Real Termination

The following design equations refer to the circuit in Figure 15. Use these to synthesize real termination imped-

ance.

Termination Impedance:

ZT =

Receive Gain:

Transmit Gain:

Hybrid Balance:

hbal = 20 log

To optimize the hybrid balance, the sum of the currents at the VFX input of the codec op amp should be set to 0.

The expression for ZHB becomes:

VT/R

IT/R

–

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

ZT

76

Ω

2

+ RP

2400

1

RT3

RGP

---------

RT3

RRCV

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

++

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

+

=

grcv

VT/R

VFR

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

=

grcv

8

1

RRCV

RT3

-----------

RRCV

RGP

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

++





1

Z T

Z T/R

---------

+





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

=

gtx

VGSX

VT/R

-----------

=

gtx

RX

–

RT6

---------

300

ZT/R

---------

×

=

RX

RHB1

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

gtx

–

grcv

×





VGSX

VFR

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





RHB k

Ω

()

RX

gtx

grcv

×

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

=

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