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STA335MLSTN/a1100avai2-channel microless high-efficiency digital audio system Sound Terminal


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STA335ML
2-channel microless high-efficiency digital audio system Sound Terminal
July 2011 Doc ID 17638 Rev 4 1/20 A335ML
2-channel microless high-efficiency digital audio system
Sound T erminal®
Features
Wide supply voltage range (5.0 V to 26 V) PowerSSO-36 exposed pad down 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 I2 S input data interface Selectable clock input ratio (256or 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 capability
Applications
LCDs DVDs Cradles Digital speakers Wireless speaker cradles
Description

The STA335ML is a single die embedding digital
audio processing and high-efficiency power
amplification, capable of operating without the aid
of an external microcontroller.
The STA335ML 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 STA335ML combines a unique 24-bit DDX®
digital class-D ternary modulator together with an
extremely low RdsON stereo power DMOS stage.
The latter is capable of a total output power of x20 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 I2 S format. Basic features, such
as oversampling clock, gain, I2 S format can be set
using a minimal number of selection pins.
The STA335ML 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.

Table 1. Device summary
STA335ML
2/20 Doc ID 17638 Rev 4
Contents Block diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6

3.1 Absolute maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.2 Thermal data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.3 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
3.4 Electrical specifications - digital section . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.5 Electrical specifications - power section . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
3.6 Power-on sequence . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
3.7 T est circuits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9 Functional description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.1 Serial audio interface protocols . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
4.2 Fault-detect recovery bypass . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.3 Zero-detect mute enable . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.4 Fade-in/out feature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.5 Oversampling selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.6 Gain selector . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
4.7 Power-down function . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11 Applications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.1 Applications schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.2 Internal voltage reference . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.3 PLL filter schematic . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
5.4 T ypical output configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14 Package thermal characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19
STA335ML Block diagram
Doc ID 17638 Rev 4 3/20
1 Block diagram
Figure 1. Block diagram
Pin description STA335ML
4/20 Doc ID 17638 Rev 4
2 Pin description
Figure 2. Pin connections (top view)

Table 2. Pin description
STA335ML Pin description
Doc ID 17638 Rev 4 5/20
Table 2. Pin description (continued)
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