The stereo 32 Ohm headset pair of drivers also includes a mixer of a LINEL and LINER pair of
stereo inputs, as well as a differential monaural auxiliary input (line level).
The DAC output can be connected through a buffer stage to the input of the audio power ampli-
fier, using 2x coupling capacitors The mono buffer stage also includes a mixer of the LINEL and
LINER inputs, as well as a differential monaural auxiliary input (line level) which can be, for
example, the output of a voice Codec output driver in mobile phones.
The audio power amplifier is a dual-mode AB class amplifier with differential output and pro-
grammable volume control. In full power mode, it is capable of driving an 8-ohm loudspeaker at
maximum power of 1W at 5V supply and 440 mW at 3.6V supply. In low power mode, it can
drive the same loudspeaker as an earpiece, making it suitable as a handsfree speaker driver in
wireless handset application. The volume, mute, power down, de-emphasis controls and 16-bit,
18-bit and 20-bit audio formats are digitally programmable via a 4-wire SPI bus and the digital
audio data are provided through a multi-format I2S interface.
2. Block Diagram
Figure 2-1.
AT73C213 Functional Block Diagram
AUXG: -33 to +12dB in
AUXP
AUXN
MONO
3dB step
+20 dB and mute
LLIG: -33 to +12dB in
3dB step
AT73C213
LINER
PGA
+ 20dB and mute
APAGAIN -22 to +20dB in
VDIG
3dB step
SPI_DOUT
INGND
RLIG: -33 to +12dB in
3dB step
Status
SPI_DIN
LINEL
PGA
+ 20dB and mute
Registers
SPI
SPI_CLK
SPI_CSB
LLOG: -46.5dB to 0dB
LMPG: -34.5dB to +12dB
LOLC: -6 to +6dB
in 3dB step
in 1.5dB step and mute
in 1.5dB step and mute
HSL
32
driver
+
DAC
Volume
Control
+
Volume
Control
Digital Filter
MCLK
RSTB
VCM
ROLC: -6 to +6dB
in 3dB
SMODE
SDIN
step
HSR
32
driver
+
DAC
Volume
Control
+
Volume
Control
Digital Filter
LRFS
BCLK
2
AVDDHS
MONOP
MONO
MONON
AT73C213
+
RLOG: -46.5dB to 0dB
in 1.5dB step and mute
RMPG: -34.5dB to +12dB
in 1.5dB step and mute
GNDD
2744B–PMAAC–11-Apr-08
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