SSM2306CPZ-REEL

2 W ，无滤波器D类立体声音频放大器 2 W, Filterless, Class-D Stereo Audio Amplifier

Product Details

The SSM2306 is a fully integrated, high efficiency, Class-D stereo audio amplifier designed to maximize performance for portable applications. The application circuit requires minimum external components and operates from a single 2.5 V to 5.0 V supply. It is capable of delivering 2 W of continuous output power with less than 10% total harmonic distortion plus noise THD + N driving a 4 Ω load from a 5.0 V supply.

The SSM2306 features an ultralow idle current, high efficiency, and a low noise modulation scheme. It operates with >87% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has a signal-to-noise ratio SNR that is better than 96 dB. Pulse-density modulation PDM offers lower electromagnetic interference EMI radiated emissions compared to other Class-D architectures.

The SSM2306 has a micropower shutdown mode with a typical shutdown current of 20 nA. Shutdown is enabled by applying a logic low to the SD pin.

The architecture of the device allows it to achieve a very low level of pop and click to minimize voltage glitches at the output during turn-on and turn-off, thereby reducing audible noise on activation and deactivation. The fully differential input of the SSM2306 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the dc input common-mode voltage is approximately VDD/2.

The SSM2306 also has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification.

The SSM2306 has a preset gain of 18 dB that can be reduced by using external resistors.

The SSM2306 is specified over the commercial temperature range −40°C to +85°C. It has built-in thermal shutdown and output short-circuit protection. It is available in a 16-lead, 3 mm × 3 mm lead frame chip scale package LFCSP.

Applications

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Mobile phones

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MP3 players

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Portable gaming

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Portable electronics

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Educational toys

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Notebook computers

### Features and Benefits

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Filterless Class-D amplifier with built-in output stage

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2 W into 4 Ω and 1.4 W into 8 Ω at 5.0 V supply

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Ultralow idle current with load resistance

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>87% efficiency at 5.0 V, 1.4 W into 8 Ω speaker

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Better than 96 dB signal-to-noise ratio SNR

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Available in a 16-lead, 3 mm × 3 mm LFCSP

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Single-supply operation from 2.5 V to 5.0 V

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20 nA ultralow shutdown current

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Short-circuit and thermal protection

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Pop-and-click suppression

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Built-in resistors reduce board component count

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Default fixed 18 dB gain and user-adjustable