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.