SSM2304 Datasheet | Analog Devices

.. Preliminary Technical Data Features Filterless Class-D amplifier with built-in output stage 2 W into 4 Ω and 1.2 W into 8 Ω at 5.0 V supply with less than 10% THD 85% efficiency at 5.0 V, 2W into 4 Ω speaker Better than 95d B SNR (signal-to-noise ratio) Available in 16-lead 3 mm × 3 mm LFCSP Single-supply operation from 2.2 V to 5.0 V 20 n A ultralow shutdown current Short-circuit and thermal protection Pop-and-click suppression Built-in resistors reduce board ponent count Default fixed 18d B gain and user-adjustable 2 W Filterless Class-D Stereo Audio Amplifier SSM2304 The SSM2304 Features a high efficiency, low noise modulation scheme. It operates with 85% efficiency at 2 W into 4 Ω from a 5.0 V supply and has a signal-to-noise ratio (SNR) that is better than 95 d B. PDM modulation is used to provide lower EMIradiated emissions pared with other Class-D architectures. The SSM2304 has a micropower shutdown mode with a typical shutdown current of 20 n A. 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. This minimizes voltage glitches at the output during turn-on and turn-off, thus reducing audible noise on activation and deactivation. The fully differential input of the SSM2304 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 SSM2304 also has excellent rejection of power supply noise, including noise caused by GSM transmission bursts and RF rectification. PSRR is typically 70 d B at 217 Hz. The gain can be set to 6 d B or 18 d B utilizing the gain control select pin connected respectively to ground or VDD. Gain can also be adjusted externally by using an external resistor. The SSM2304 is specified over the mercial temperature range (- 40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is...