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Giải thích chi tiết về linh kiện  18-bit Low Power Asynchronous Stereo Audio DAC with Integrated Power Amplifiers and Voice Codec
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STw5094A
2/51
– 11 mW operating power in voice codec mode
(typ. at 2.7 V).
– 1.8 V to 3.3 V CMOS compatible digital
interfaces
– Programmable PCM interface
–I2C compatible control interface
– Programmable master/slave serial audio data
input interface (I2S and other formats)
– Frequency programmable clock output
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
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 cel-
lular terminals with added MP3 and FM radio lis-
tening.
The STw5094A registers are accessed through an
I2C-bus compatible interface.
The STw5094A asynchronous stereo audio DAC
section is suited for MP3, or any other audio stereo
source, listening. It supports any rate from 8 kHz
to 48 kHz, can tolerate jitter on audio data and
does not requires an oversampled clock. The au-
dio data serial interface can be master or slave, it
is I2S compatible and supports other standard se-
rial interface formats. The internal D to A convert-
ers work with 18 bit input resolution.
The stereo headphones drivers can also be used
for FM radio listening via an auxiliary stereo ana-
log input. A loudspeaker driver can also be used
for monophonic group listening.
The STw5094A voice Codec section can be con-
figured either as a 14-bit linear or as an 8-bit com-
panded PCM coder. The frame voice Codec
sample rate can be either the standard 8 kHz val-
ue or the extended 16 kHz one.
In addition to the stereo audio DAC and Codec
⁄ fil-
ter
functions,
STw5094A
includes
a
tone
⁄ ring⁄ DTMF generator that can be used both
in audio listening mode and in voice Codec mode,
a sidetone generation, a buzzer driver output and
a remote control function tailored to handle an ex-
ternal on-hook off-hook button. STw5094A Voice
Codec fulfills and exceeds D3
⁄ D4 and CCITT
recommendations and ETSI requirements for dig-
ital handset terminals. The Stereo Audio DAC part
fulfills and exceeds the requirements for MP3
quality and FM radio quality listening. Main appli-
cations include digital mobile phones with added
low-power high-quality MP3 and
⁄ or FM radio lis-
tening features, or any battery powered equipment
that requires Stereo Audio DAC with Headphones
drivers.
ORDER CODES
Part Number
Description
STw5094AD/LF
TFBGA 36 Tray
STw5094ADT/LF
TFBGA 36 Tape and Reel


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