SSM2377 Datasheet | Analog Devices

Features Filterless, Class-D amplifier with spread-spectrum Σ-Δ modulation 2.5 W into 4 Ω load and 1.4 W into 8 Ω load at 5.0 V supply with <1% total harmonic distortion plus noise (THD + N) 92% efficiency at 5.0 V, 1.4 W into 8 Ω speaker >100 d B signal-to-noise ratio (SNR) High PSRR at 217 Hz: 80 d B Ultralow EMI emissions Single-supply operation from 2.5 V to 5.5 V Gain select function: 6 d B or 12 d B Fixed input impedance of 80 kΩ 100 n A shutdown current Short-circuit and thermal protection with autorecovery Available in a 9-ball, 1.2 mm × 1.2 mm WLCSP Pop-and-click suppression The SSM2377 operates with 92% efficiency at 1.4 W into 8 Ω from a 5.0 V supply and has an SNR of >100 d B. Spread-spectrum pulse density modulation (PDM) is used to provide lower EMI-radiated emissions pared with other Class-D architectures. The inherent randomized nature of spread-spectrum PDM eliminates the clock intermodulation (beating effect) of several amplifiers in close proximity. The SSM2377 produces ultralow EMI emissions that significantly reduce the radiated emissions at the Class-D outputs, particularly above 100 MHz. The SSM2377 passes FCC Class B radiated emission testing with 50 cm, unshielded speaker cable without any external filtering. The ultralow EMI emissions of the SSM2377 are also helpful for antenna and RF sensitivity problems. The device is configured for either a 6 d B or a 12 d B gain setting by connecting the GAIN pin to the VDD pin or the GND pin, respectively. Input impedance is a fixed value of 80 kΩ, independent of the gain select operation. The SSM2377 has a micropower shutdown mode with a typical shutdown current of 100 n A. Shutdown is enabled by applying a logic low to the SD pin. The device also includes pop-and-click suppression circuitry, which minimizes voltage glitches at the output during turn-on and turn-off, reducing audible noise on activation and deactivation. Built-in input low-pass filtering is also included to suppress outof-band noise...