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 Ω load stereo headphones drivers, 8 Ω

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 Ω

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 Ωwith 40 dB range

programmable gain

– Balanced earpiece⁄ loudspeaker output.

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

over 8 Ωwith 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 Ω load earpiece/loudspeaker driver,

16 Ω 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