STA335ML 2-channel microless high-efficiency digital audio system Sound Terminal Features PowerSSO-36 Wide supply voltage range (5.0 V to 26 V) with exposed PowerSSO-36 exposed pad down package pad down (EPD) 2 channels of 24-bit DDX 100-dB SNR and dynamic range Description Selectable 32 kHz to 48 kHz input sample rates The STA335ML is a single die embedding digital Automatic zero-detect mute audio processing and high-efficiency power amplification, capable of operating without the aid Automatic invalid input detect mute of an external microcontroller. 2 2-channel I S input data interface The STA335ML is part of the Sound Terminal Selectable clock input ratio (256 or 364 * fs) family that provides full digital audio streaming to Max power correction for lower full power the speakers and offers cost effectiveness, low power dissipation and sound enrichment. 96-kHz internal processing sample rate, 24-bit precision The STA335ML combines a unique 24-bit DDX Thermal overload and short-circuit protection digital class-D ternary modulator together with an embedded extremely low R stereo power DMOS stage. dsON The latter is capable of a total output power of Filterless configuration capability 2 x 20 W with outstanding performance in terms of efficiency (>90 %), THD, SNR and EMI. Applications The microless feature allows its use in low-cost LCDs applications (cradle, digital speakers, audio terminals) where no microcontroller is needed. DVDs The serial audio data interface accepts the Cradles 2 universally used I S format. Basic features, such Digital speakers 2 as oversampling clock, gain, I S format can be set Wireless speaker cradles 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 Order code Package Packaging STA335MLJ PowerSSO-36 EPD Tube STA335MLJ13TR PowerSSO-36 EPD Tape and reel July 2011 Doc ID 17638 Rev 4 1/20 www.st.com 20STA335ML Contents 1 Block diagram 3 2 Pin description . 4 3 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 Test circuits . 9 4 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 5 Applications . 12 5.1 Applications schematic . 12 5.2 Internal voltage reference . 12 5.3 PLL filter schematic . 12 5.4 Typical output configuration . 14 6 Package thermal characteristics 16 7 Package mechanical data 17 8 Revision history . 19 2/20 Doc ID 17638 Rev 4