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High quality mono output is provided. The DAC output can be connected through a buffer stage
to the input of the audio power amplifier, using 2x coupling capacitors The mono buffer stage
also includes a mixer of the LINEL and LINER inputs which can be, for example, the output of a
voice Codec output driver in mobile phones.
The Audio Power Amplifier is a differential amplifier designed in CMOS technology. It is capa-
ble of driving an 8 Ohm Loudspeaker at maximum power of 440mW, making it suitable as a
hands - free speaker driver in a Wireless Handset Application.
The volume, mute, power down, de-emphasis controls and 16-bit, 18-bit and 20-bit audio for-
mats are digitally programmable via a 4-wire SPI bus or via a 2-wire TWI bus and the digital
audio data are provided through a multi-format I2S interface.
2. Block Diagram
Figure 2-1.
AT73C240 Functional Block Diagram
AT73C240
VDIG
Voltage
AVDD
LINER
-36 to +12dB / 3dB step
Reference
SPI_DOUT
AVDDHS
PGA
SPI_DIN / TWD
INGND
LINEL
-36 to +12dB / 3dB step
PGA
Status
Registers
SPI
SPI_CLK / TWCK
SPI_CSB / TW_ADD
-6 to +6dB / 3dB step
-46.5dB to 0dB / 1.5dB step -34.5dB to +12dB / 1.5dB step
MCLK
HSL
32
driver
+
DAC
Volume
Control
+
Volume
Control
Digital Filter
RSTB
SMODE
VCM
-6 to +6dB / 3dB step
SDIN
HSR
32
driver
+
DAC
Volume
Control
+
Volume
Control
Digital Filter
LRFS
2
GNDA
MONOP
MONO
MONON
AT73C240
+
-46.5dB to 0dB / 1.5dB step -34.5dB to +12dB / 1.5dB step
BCLK
GNDD
6464A–PMAAC–28-Apr-09
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