1/51
April 2005
.
STw5094A
18-bit Low Power Asynchronous Stereo Audio DAC
with Integrated Power Amplifiers and Voice Codec
Rev. 1
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
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
General features
Single 2.7 V to 3.3 V supply
Extended temperature range operation
1
-40 C to 85 C
1
W standby power (typ. AT 2.7V).
16 mW operating power in audio listening
mode (typ. at 2.7 V).
1.Functionality guaranteed in the range -40C to +85C; Timing and Electrical Spec. are guaranteed in the range -30C to +85C.
TFBGA 6x6 (36 pins)
ORDER CODES: STw5094AD/LF, STw5094ADT/LF
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
I
2
C compatible control interface
Programmable master/slave serial audio data
input interface (I
2
S 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
I
2
C-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 I
2
S 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
3/51
STw5094A
TABLE OF CONTENT
PIN CONNECTIONS (TOP VIEW) ................................................................................... 4
FUNCTIONAL BLOCK DIAGRAM .................................................................................... 5
SIGNAL DESCRIPTION ................................................................................................... 6
FUNCTIONAL DESCRIPTION ......................................................................................... 8
PROGRAMMABLE REGISTERS ................................................................................... 15
TIMING DIAGRAMS ....................................................................................................... 25
ABSOLUTE MAXIMUM RATINGS ................................................................................. 33
OPERATIVE SUPPLY VOLTAGES ................................................................................ 33
TIMING SPECIFICATIONS ............................................................................................ 33
AMCK timing
33
MCLK and AUXCLK timing
34
Audio interface signals timing
34
PCM interface timing
34
I2C bus control port timing
35
ELECTRICAL CHARACTERISTICS ............................................................................... 36
Digital Interfaces (
Figure 16
)
36
Analog Interfaces
36
ANALOG INPUT/OUTPUT OPERATIVE RANGES ....................................................... 37
Microphone Input Levels - Absolute levels at MIC1, MIC2, MIC3
37
FM Input Levels - Absolute levels at FML, FMR
37
Power Output Levels - Absolute levels at LSP-LSN (Differentially measured)
37
Tones Levels
37
VOICE CODEC CHARACTERISTICS ............................................................................ 38
VOICE CODEC AMPLITUDE RESPONSE
38
VOICE CODEC AMPLITUDE RESPONSE (continued)
39
VOICE CODEC ENVELOPE DELAY DISTORTION WITH FREQUENCY
40
VOICE CODEC NOISE
40
VOICE CODEC CROSSTALK
40
VOICE CODEC DISTORTION
41
VOICE CODEC DISTORTION
42
STEREO AUDIO DAC and FM CHARACTERISTICS
43
POWER DISSIPATION
44
TFBGA PACKAGE OUTLINE ......................................................................................... 48
REVISION HISTORY ...................................................................................................... 50
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