SSM2356 Datasheet | Analog Devices

Data Sheet Features Filterless stereo Class-D amplifier with Σ-Δ modulation No sync necessary when using multiple Class-D amplifiers from Analog Devices, Inc. 2 × 2W into 4 Ω load and 2x1.4 W into 8 Ω load at 5.0 V supply with <1% total harmonic distortion (THD + N) 92% efficiency at 5.0 V, 1.4 W into 8 Ω speaker >103 d B signal-to-noise ratio (SNR) Single-supply operation from 2.5 V to 5.5 V 20 n A shutdown current; left/right channel control Short-circuit and thermal protection Available in a 16-ball, 1.66 mm × 1.66 mm WLCSP Pop-and-click suppression Built-in resistors that reduce board ponent count User-selectable 6 d B or 18 d B gain setting User-selectable ultralow EMI emission mode 2 × 2W Filterless Class-D Stereo Audio Amplifier SSM2356 The SSM2356 Features a high efficiency, low noise modulation scheme that requires no external LC output filters. The modulation continues to provide high efficiency even at low output power. It operates with 92% efficiency at 1.4 W into 8 Ω or 85% efficiency at 2.0 W into 4 Ω from a 5.0 V supply and has an SNR of >103 d B. Spread-spectrum pulse density modulation is used to provide lower EMI-radiated emissions pared with other Class-D architectures. The SSM2356 includes an optional modulation select pin (ultralow EMI emission mode) that significantly reduces the radiated emissions at the Class-D outputs, particularly above 100 MHz. The SSM2356 has a micropower shutdown mode with a typical shutdown current of 20 n A. Shutdown is enabled by applying a logic low to the SDNR and SDNL pins. The device also includes pop-and-click suppression circuitry that 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 SSM2356 provides excellent rejection of mon-mode noise on the input. Input coupling capacitors can be omitted if the dc input mon-mode voltage is approximately VDD/2. The preset gain of SSM2356 can be selected...