SSM2335

无滤波器，高效率，单声道3瓦D类音频放大器 Filterless, High Efficiency, Mono 3 W Class-D Audio Amplifier

Product Details

The is a fully integrated, high efficiency, Class-D audio amplifier. It is designed to maximize performance for mobile phone applications. The application circuit requires a minimum of external components and operates from a single 2.5 V to 5.5 V supply. It is capable of delivering 3 W of continuous output power with <1% THD + N driving a 3 Ω load from a 5.0 V supply.

The SSM2335 features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modu-lation continues to provide high efficiency even at low output power. It operates with 93% efficiency at 1.4 W into 8 Ω or 85% efficiency at 3 W into 3 Ω from a 5.0 V supply and has an SNR of >96 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

The SSM2335 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 device also includes pop-and-click suppression circuitry. This suppression circuitry minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation.

The fully differential input of the SSM2335 provides excellent rejection of common-mode noise on the input. Input coupling capacitors can be omitted if the input dc common-mode voltage is approximately VDD/2.

The default gain of the SSM2335 is 18 dB, but users can reduce the gain by using a pair of external resistors .

The SSM2335 is specified over the industrial temperature range of −40°C to +85°C. It has built-in thermal shutdown and output short-circuit protection. It is available in a 9-ball, 1.5 mm × 1.5 mm wafer level chip scale package WLCSP.

**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

### Features and Benefits

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Filterless Class-D amplifier with Σ-Δ modulation

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No sync necessary when using multiple Class-D amplifiers from Analog Devices, Inc.

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3 W into 3 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <1% total harmonic distortion THD + N

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93% efficiency at 5.0 V, 1.4 W into 8 Ω speaker

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>96 dB signal-to-noise ratio SNR

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Single-supply operation from 2.5 V to 5.5 V

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20 nA ultralow shutdown current

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Short-circuit and thermal protection

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Available in 9-ball, 1.5 mm × 1.5 mm WLCSP

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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 or user-adjustable gain setting