GENERAL DESCRIPTION

ST5090 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.

ST5090 offers a number of programmable functions accessed through a serial control channelthat easily interfaces to any classical microcontroller.

FEATURES:

Complete CODEC and FILTER systemincluding:

■ 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.

■ TRANSMITAND RECEIVE 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 3.3V ±10 OR 5V ±10 SUPPLY SELECTABLE.

■ EXTENDED TEMPERATURE RANGE OPERATION(*) -40°C to 85°C.

■ 1.5 μW STANDBY POWER (TYP. AT 3V).

■ 21 mW OPERATING POWER (TYP. AT 3V).

■ 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.