GENERAL DESCRIPTION

STw5094A is a low power asynchronous stereo audio DAC device with headphones amplifiers for high quality MP3 and FM radio listening. The STw5094A includes also an high performance low power combined PCM Codec? filter tailored to implement the audio front-end functions required by low voltage low power consumption digital cellular terminals with added MP3 and FM radio listening.

FEATURES

■ Complete stereo audio digital to analog

converters and filters

– 18-bit, 8 kHz to 48 kHz DAC with sample-rate

conversion

– Linear phase analog&digital filters

– 16 ? load stereo headphones drivers, 8 ?

load mono loudspeaker driver for group

listening

■ Stereo audio DAC features

– Asynchronous sampling DAC: does not

require oversampled clock and information

on the audio data sampling frequency.

Jitter tolerant

– Multibit Σ? modulator with data weighted

averaging DAC

– 92 dB dynamic range, 0.01 THD over 16 ?

load performance

– Support any sampling frequency in the range

8 kHz to 48 kHz

– DSP functions for bass-treble-volume

controls, deemphasis filter and dynamic

compression

– Tones from tone generator can be injected in

the audio paths

■ Stereo headphones and loudspeaker/earpiece

power amplifiers features and stereo input for

FM radio features:

– 20 kHz bandwidth stereo headphones

outputs. Driving capability: 40 mW

(typ. 0.1 T.H.D) over 16 ?with 40 dB range

programmable gain

– Balanced earpiece? loudspeaker output.

Driving capability: 300 mW (typ. 0.1 T.H.D)

over 8 ?with 30dB range programmable gain

– Analog stereo input for FM radio with 38 dB

range programmable gain

■ Complete CODEC and filter system

– 14-bit linear or 8-bit companded ADC and

DAC

– Transmit and receive digital band-pass filters

– Active antialias and smoothing filters

– 8 ? load earpiece/loudspeaker driver,

16 ? load auxiliary driver

■ Voice CODEC features

– Support 8 kHz or 16 kHz sampling rate

– One microphone biasing output

– Remote control function

– Three switchable microphone amplifier

inputs. 42.5 dB range programmable gain

– Transient supression during power up and

power down

– Internal programmable sidetone

– Internal ring, tone and dtmf generator

– Programmable PWM buzzer driver (Continue ...)

APPLICATIONS

■ CDMA,GSM,DCS1800,PCS1900,JDC digital

cellular telephones with MP3 and FM radio

stereo listening functions

■ Portable devices with a stereo digital audio

source and FM radio listening function