Microsemi

Linfinity Microelectronics Division

11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570

Page 2

Copyright

 2001

Rev. 1.1,2003-06-10

AudioMAX™

LX1721 / 1722

Class-D Stereo Power Amplifier Controller

I N T E GRA T ED

PR ODUC T S

TH ERMAL DATA

DB

THERMAL RESISTANCE

θ

JA

50

°C/W

The

system. All of the above assume no ambient airflow.

PACKAGE PIN OUT

1

22

23

44

LFAOUT

CPWM

RPWM

LMUTE

LEAOUT

LEAIN

VREF

CLOCK

GND

V25

LIN+

LIN-

LAMPOUT

RIN+

RIN-

RAMPOUT

SLEEP

STATUS

RMUTE

REAIN

REAOUT

RFAOUT

LFBK-

LFBK+

LISN

VDD

CN

PVDD

PGND

LN+

LP+

LP-

LN-

RN-

RP-

RP+

RN+

PGND

CP

PVDD

NC

RISN

RFBK+

RFBK-

(Top View)

DESCRIPTION (CO N TINUTED)

The stereo output controller is available in either an

LX1722 high power version (>65Wrms, 4Ω) with a supply

voltage range of 7V-25V or an LX1721 high fidelity

version (better SNR performance) with a supply voltage

range of 7V-15V.

The current rating of the external

MOSFET’s, the available supply voltage, and speaker load

primarily limits the maximum output power. The amplifier

provides high fidelity performance and is designed to

operate over the full 20Hz to 20kHz audio band. Signal

distortion measurements yield.

THD+N levels of 0.06%(1kHz, 1Wrms). Efficiency is

greater than 80% typical, which eliminates the need for

heatsinks in most applications. The AudioMAX™ solution

requires a single supply voltage, simplifying input power

requirements where a dual supply may not be available. To

minimize potential environmental noise issues and ease the

integration of the amplifier into a variety of applications,

features such as a balanced/differential audio input and a high

power supply rejection ratio help reduce the effects of noise

from the audio signal or power supply.