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 dB signal-to-noise ratio (SNR) High PSRR at 217 Hz: 80 dB Ultralow EMI emissions Single-supply operation from 2.5 V to 5.5 V Gain select function: 6 dB or 12 dB Fixed input impedance of 80 kΩ 100 nA 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 Spread-spectrum pulse density modulation (PDM) is used to provide lower EMI-radiated emissions compared with other Class-D architectures. 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 dB or a 12 dB gain setting by connecting the GAIN pin to the VDD pin or the GND pin, respectively.
Analog Devices
