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February 2010 Doc ID 13177 Rev 5 1/20
20
STA333ML
2-channel microless high-efficiency digital audio system
Sound Terminal™
Features
Wide supply voltage range (4.5 - 20 V)
2 x 20 W into 8 Ω at V
CC
= 18 V
PowerSSO-36 exposed pad package
2 channels of 24-bit DDX
®
100-dB SNR and dynamic range
Selectable 32 kHz to 48 kHz input sample
rates
Automatic zero-detect mute
Automatic invalid input detect mute
2-channel I
2
S input data interface
Selectable clock input ratio (256 or 364 * fs)
Max power correction for lower full power
96 kHz internal processing sample rate, 24-bit
precision
Thermal overload and short-circuit protection
embedded
Filterless configuration capable
Applications
LCD
DVD
Cradle
Digital speaker
Wireless speaker cradle
Description
STA333ML is a single die embedding digital audio
processing and high-efficiency power
amplification, capable of operating without the aid
of an external microcontroller.
The STA333ML is part of the Sound Terminal™
family that provides full digital audio streaming to
the speakers and offers cost effectiveness, low
power dissipation and sound enrichment.
The STA333ML combines a unique 24-bit DDX
®
digital class-D ternary modulator together with an
extremely low R
dsON
stereo power DMOS stage.
The latter is capable of a total output power of
2 x 20 W with outstanding performance in terms
of efficiency (>90 %), THD, SNR and EMI.
The microless feature allows its use in low-cost
applications (cradle, digital speakers, audio
terminals) where no microcontroller is needed.
The serial audio data interface accepts the
universally used I
2
S format. Basic features, like
oversampling clock, gain, I
2
S format can be set
using a minimal number of selection pins.
STA333ML is self-protected against thermal
overload, overcurrent, short-circuit and
overvoltage conditions.
The fault condition is also signalled on an external
pin (INT_LINE) for specific requirements.
PowerSSO-36
with exposed
pad down (EPD)
Table 1. Device summary
Order code Package Packaging
STA333ML PowerSSO-36 EPD Tube
STA333ML13TR PowerSSO-36 EPD Tape and reel
www.st.com
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