L9313 datasheet(7/40 Pages) AGERE

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Data Sheet

September 2001

Full-Feature SLIC and Ringing Relay for TR-57 Applications

L9313 Line Interface and Line Access Circuit

Agere Systems Inc.

Description (continued)

The L9313 uses a voltage feed, current sense architec-

ture; thus, the transmit gain is a transconductance. The

L9313 transconductance is set via a single external

resistor, and this device is designed for optimal perfor-

mance with a transconductance set at 300 V/A.

The L9313 offers an option for a single-ended to differ-

ential receive gain of either 8 or 2. These options are

mask programmable at the factory and are selected by

choice of part number.

A receive gain of 8 is more appropriate when choosing

a first-generation type codec where termination imped-

ance, hybrid balance, and overall gains are set by

external analog filters. The higher gain is typically

required for synthesization of complex termination

impedance.

A receive gain of 2 is more appropriate when choosing

a third-generation type codec. Third-generation codecs

will synthesize termination impedance, set hybrid bal-

ance, and set overall gains. To accomplish these func-

tions, third-generation codecs typically have both

analog and digital gain filters. For optimal signal-to-

noise performance, it is best to operate the codec at a

higher gain level. If the SLIC then provides a high gain,

the SLIC output may be saturated causing clipping dis-

tortion of the signal at tip and ring. To avoid this situa-

tion, with a higher-gain SLIC, external resistor dividers

are used. These external components are not neces-

sary with the lower gain offered by the L9313.

The RCVP/RCVN SLIC inputs are floating inputs. If

there is not feedback from RCVP/RCVN to VITR,

RCVP/RCVN may be directly coupled to the codec out-

put. If there is feedback, RCVP/RCVN must be ac-cou-

pled to the codec output.

This device is packaged in a 44-pin PLCC surface-

mount package.

Architecture

12-3523f (F)

Figure 1. Architecture Diagram

–

AAC

–

2.35 V

BANDGAP

REFERENCE

RFT

TIP/RING

CURRENT

SENSE

BGND

ITR/325

VITR

RFR

VBAT

BGND

VBAT

ITR

RING TRIP

DETECTOR

SCAN

RING GND

DETECTOR

SCAN

CLAMP

SCAN

VBAT

BGND

ILC

INTERFACE

SWITCHHOOK

WINDOW

COMPARATOR

REF

CF2

CURRENT LIMITER

AND

INRUSH CONTROL

CF2

REF

PARALLEL DATA INTERFACE

VREF

TXI

ITR

TRNG

RTS

RSW

RRING

VTX

VCC AGND

RGDET

ICM

VBAT2/PWR

VBAT

VBAT1

BGND

RCVN

FB1

CF2

FB2

FBRB

DGND

VDD

VPROG

LATCH

RESET

LCTH

LCF

VITR

CONTROL

ILC

VTX

+5VD

(1 V/50 mA)

SW3

SW1

Ω

SW2

Ω

+5VA

VBAT

BGND

–

OUT AT

–

OUT AR

NSTAT

2.35 V

VREF

SW4

Ω

RCVP

OVH

CF1

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