ADI SSM2319CBZ-REEL

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.

It features a high efficiency, low noise modulation scheme that does not require any external LC output filters. The modulation continues to provide high efficiency even at low output power. It operates with 90% efficiency at 1.4 W into 8 Ω or 85% efficiency at 3 W into 3Ω from a 5.0 V supply and has an SNR of 98 dB. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions compared with other Class-D architectures.

SYNC can be activated in the event that end users are concerned about clock intermodulation (beating effect) of several amplifiers in close proximity.

It 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 minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation.

The default gain is 12 dB, but users can reduce the gain by using a pair of external resistors.

It 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).

• Filterless Class-D amplifier with ultraefficient spreadspectrum Σ-Δ modulation
• Internal modulator synchronization (SYNC)
• 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)
• 90% efficiency at 5.0 V, 1.4 W into 8 Ω speaker
• Signal-to-noise ratio (SNR): 98 dB
• Single-supply operation: 2.5 V to 5.5 V
• Ultralow shutdown current: 20 nA
• Short-circuit and thermal protection with autorecovery
• Available in 9-ball, 1.5 mm×1.5 mm WLCSP
• Pop-and-click suppression
• Built-in resistors reduce board component count
• Default fixed 12 dB or user-adjustable gain setting

• Mobile phones
• MP3 players
• Portable gaming
• Portable electronics
• Educational toys