GENERAL DESCRIPTION

ST5092 is a high performance low power combined PCM CODEC/FILTER device tailored to implement the audio front-end functions required by the next generation low voltage/low power consumption digital terminals.

FEATURES:

Complete CODEC and FILTER system including:

■ 14 BIT LINEAR ANALOG TO DIGITAL AND

DIGITAL TO ANALOG CONVERTERS.

■ 8 BIT COMPANDED ANALOG TO DIGITAL

AND DIGITAL TO ANALOG CONVERTERS

A-LAW OR µ-LAW.

■ TRANSMITANDRECEIVE BAND-PASSFILTERS

■ ACTIVE ANTIALIAS NOISE FILTER.

Phone Features:

■ THREE SWITCHABLE MICROPHONE AMPLIFIER

INPUTS. GAIN PROGRAMMABLE:

20 dB PREAMP. (+MUTE), 0 . . 22.5 dB AMPLIFIER,

1.5 dB STEPS.

■ EARPIECE AUDIO OUTPUT. ATTENUATION

PROGRAMMABLE: 0 . . 30 dB, 2 dB STEPS.

■ EXTERNAL AUDIO OUTPUT. ATTENUATION

PROGRAMMABLE: 0 . . 30 dB, 2 dB STEPS.

■ TRANSIENT SUPRESSION SIGNAL DURING

POWER ON AND DURING AMPLIFIER

SWITCHING.

■ INTERNAL PROGRAMMABLE SIDETONE

CIRCUIT. ATTENUATION PROGRAMMABLE:

16 dB RANGE, 1 dB STEP. ROUTING POSSIBLE

TO BOTH OUTPUTS.

■ INTERNAL RING OR TONE GENERATOR INCLUDING

DTMF TONES, SINEWAVE OR SQUAREWAVE

WAVEFORMS. ATTENUATION PROGRAMMABLE:

27dB RANGE, 3dB STEP. THREE FREQUENCY RANGES:

a) 3.9Hz . . . . 996Hz, 3.9Hz STEP

b) 7.8Hz . . . . 1992Hz, 7.8Hz STEP

c) 15.6Hz . . . . 3984Hz, 15.6Hz STEP

■ PROGRAMMABLE PULSE WIDTH MODULATED

BUZZER DRIVER OUTPUT.

General Features:

■ SINGLE 2.7V to 3.6V SUPPLY

■ EXTENDED TEMPERATURE RANGE OPERATION (*)

-40°C to85°C.

■ 1.5 µW STANDBY POWER (TYP. AT 3.0V).

■ 15mW OPERATING POWER (TYP. AT 3.0V).

■ 13mW OPERATING POWER (TYP. AT 2.7V).

■ CMOS COMPATIBLE DIGITAL INTERFACES.

■ PROGRAMMABLE PCM AND CONTROL

INTERFACE MICROWIRE COMPATIBLE.

APPLICATIONS:

■ GSM DIGITAL CELLULAR TELEPHONES.

■ CT2 DIGITAL CORDLESS TELEPHONES.

■ DECT DIGITAL CORDLESS TELEPHONES.

■ BATTERY OPERATED AUDIO FRONT-ENDS

FOR DSPs.