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STLC1512

November 2000

This is preliminary information on a new product now in development. Details are subject to change without notice.

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Low power architecture -- Class AB, current

drive, output stage through a centre tapped

transformer to facilitate power supply switching

between 5.0V and a lower voltage. (3.3V in the

reference design) This gives a reduction in

power consumption.

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480mW power consumption with a typical G.lite

signal.

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600mA current driving capability

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Positive +5.0V and one lower supply. (3.3V in

the reference design)

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Switching power supplies to save power

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Thermal overload shutdown

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Four programmable receive gains

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Opamp for a low pass filter in the receive path

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Undedicated opamp with separate power down

control (used as a transmit path filter in the

reference design)

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Separate power down control for Tx and Rx

path

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48-pin TQFP (7x7x1.4mm) package

1.0 GENERAL DESCRIPTION

The STLC1512 G.lite line driver chip contains the line

driver as well as part of the receive path required in a

central office G.lite modem. It provides an interface

between the AFE chip (STLC1511) and the tele-

phone line. The line driver chip has been designed

with low power consumption, high signal to noise

plus distortion ratio and high current driving capabili-

ty.

TQFP48 (7x7x1.40)

ORDERING NUMBER: STLC1512

PRODUCT PREVIEW

NorthenLite™ G.lite Loop Driver

Figure 1. Block Diagram

TXANG

RBIAS

RXPD

LPFOUT

LPFIN

REF2P5

DCFBON

DCFBOP

FPN

FPP

PAIP

PAIN

PWRVEEx

PAOPx

BUFFP

BUFFN

PAONx

PGA

RX REF

Buffer

LPF AMP

BIAS

Thermal

Shutdown

Preamp

Power

Stage

DC

Feedback

Amp

OPAMP

TX REF

Buffer

AMPPD

TXPD

PGAIN

PGA1

PGA0

RXANG

DCFBIN

DCFBIP

AMPIP

AMPIN

AMPOUT

PGAOUT