參數(shù)資料
型號(hào)： STW5094
廠商： 意法半導(dǎo)體
元件分類： Codec
英文描述： 18 BIT 8kHz TO 48kHz LOW POWER STEREO AUDIO DAC WITH INTEGRATED POWER AMPLIFIERS AND VOICE CODEC
中文描述： 18位8kHz至48kHz的低功耗立體聲音頻DAC，具有集成功率放大器和語(yǔ)音編解碼器
文件頁(yè)數(shù)： 6/37頁(yè)
文件大?。?/td> 447K
代理商： STW5094
STw5094
6/37
FUNCTIONAL DESCRIPTION
I DEVICE MODES
STw5094 can work in 4 different modes, selected by bits
MD
in Control Register 18 (
CR18
). Depending on the
mode different data interfaces, clock inputs, and internal blocks are selected. A built-in power consumption
management function keeps in power down the blocks that are not needed by the selected operating mode. In
all the modes the Output Drivers can be activated in all the combinations allowed by bits
OS
in
CR6
(in case of
stereo input and
LSP
N
driver selected the Left channel is sent to this driver, while in case of voice input and
HPL
+
HPR
drivers selected the same signal is sent to both drivers).
I.1
Audio Mode:
In Audio mode the path from the I
2
S I
F to the output drivers is active to allow the Stereo Audio DAC function.
The I
2
S I
F is active while the PCM I
F is inactive.
The master clock of the device is
OCK
. The
OCK
frequency must be 256 times the sampling frequency for the
MPEG1 and MPEG2 sampling frequencies and 512 times for the MPEG2.5 sampling frequencies.
The sampling frequency (
LRCK
frequency) can be selected with bits
LAY
and
AFS
in
REG6
.
Since the
OCK
clock is used directly in all the Audio blocks, its jitter and spectral properties must be adequate
to the desired Audio quality.
The Tone
Ring
DTMF generator can be activated if needed. The FM preamplifiers are in power down.
I.2
Voice Mode:
In Voice mode the TX path from microphone or line input to
DX
and the RX path from
DR
to the output drivers
are active to allow the PCM CODEC function. The PCM I
F is active while the I
2
S I
F is inactive.
The master clock of the device is
MCLK
, the frequency of the clock can be selected with bits
F
in
CR0
.
The FM preamplifiers are in power down.
I.3
Tone Only Mode:
In Tone Only mode the path from the Tone generator to the output Drivers and to the Buzzer is active to allow
Tones or Ringer listening only. Both I
2
S I
F and PCM I
F are inactive, as all the Audio and Voice converters
functions.
The master clock of the device can be selected to be
AUXCLK
,
MCLK
or
OCK
(bits
CFM
in
CR18
).
The Tone
Ring
DTMF generator can be activated if needed. The FM preamplifiers are in power down.
I.4
FM Mode:
In FM mode the path from
FML
and
FMR
analog inputs to the output Drivers is active to allow FM Stereo Radio
listening. Both I
2
S I
F and PCM I
F are inactive, as all the Audio and Voice converters functions.
The master clock of the device can be selected to be
AUXCLK
,
MCLK
or
OCK
(bits
CFM
in
CR18)
.
The Tone
Ring
DTMF generator is in power down.
II DEVICE OPERATION
II.1
Power on initialization and Software Reset:
When power is first applied, power on reset circuitry initializes STw5094 and puts it into the power down state.
All the Registers are initialized as indicated in the Control Register description section. All the functions are
disabled.
The registers can be initialized also writing bit
SRS
(software reset) in
CR18.
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