DA9055 Datasheet, PDF (1/3 Pages) Dialog Semiconductor – 2 Channel buck PMIC & Audio codec with capless

DA9055
2 Channel buck PMIC & Audio codec with capless
headphone driver for portable media applications
DA9055 combines an ultra low power audio codec with core power management functions
targeting standalone audio/video digital processors. By optimising both the power and
signal chain paths for performance and efficiency, the codec can provide 98dB SNR at the
headphone whilst consuming less than 3mW from the battery.
Two DCDC Buck Converters rated for 500mA provide the core supplies using small external
components (2.2uH/10uF for high efficiency). Additionally six linear regulators are available, one
100mA, four 150mA and one 300mA.
All LDO regulators support low voltage peripherals, five are programmable upto 3.3V. They may
be supplied from a suitable DCDC rail to improve system efficiency, one provides dynamic voltage
control (DVC). Also integrated is a low power 32kHz crystal oscillator with buffered CLK output. An
embedded 4ch GP ADC provides voltage and temperature supervision.
The audio front-end simultaneously supports stereo FM line input with upto three microphones with
dual switchable bias. Comprehensive analog mixing and bypass paths to the output drivers are
available.The headphone output is true ground with integrated charge pump. A dedicated mono
lineout channel is available and can deliver 400mW into 8Ω mini-speaker when supplied from 3.0V.
A stereo line channel is provided for auxiliary signals and this audio signal may be mixed into the
input and/or output mixer paths.
To fully optimise each customer application, a range of built-in filtering, equalisation or audio dsp
enhancements are available. These are accessible by the processor over the 2- wire serial interface
and can be used to minimise latency and power consumption.
The codec supports both master and slave mode operation. The low power fractional PLL has been
optimised to support a wide range of sample and reference clock frequencies. Internal suppression
circuits help maintain audio synchronisation in the presence of system noise on the external clock.
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