Product Details
●The SSM3302 is a fully integrated, high efficiency, stereo Class-D audio amplifier. The application circuit requires minimal external components and operates from a single 7 V to 18 V supply. The device is capable of delivering 2 × 10 W of continuous output power into a 4 Ω load (or 2 × 8 W into 8 Ω) with <1% THD + N from a 12 V supply. In addition, while mono mode is activated, the user can drive a load as small as 2 Ω up to 20 W continuous output power by stacking the stereo output terminals.
●The SSM3302 features a high efficiency, low noise modulation scheme that requires no external LC output filters. This scheme continues to provide high efficiency even at low output power. The SSM3302 operates with 90% efficiency at 7 W into an 8 Ω load or with 82% efficiency at 10 W into 4 Ω from a 12 V supply, and it has an SNR of >98 dB.
●Spread spectrum pulse density modulation (PDM) is used to provide lower EMI radiated emissions compared with other Class-D architectures. The SSM3302 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 SSM3302 can pass FCC Class-B emissions testing with an unshielded 20 inch cable using common-mode choke-based filtering.
●The fully differential input of the SSM3302 provides excellent rejection of common-mode noise on the input. The device also includes a highly flexible gain select pin that only requires one series resistor to choose a gain between 9 dB and 24 dB, with no change to the input impedance. The benefit of this is to improve gain matching between multiple SSM3302 devices within a single application compared with using external resistors to set gain.
●The SSM3302 includes an integrated voltage regulator that generates a 5 V rail.
●The SSM3302 has a micropower shutdown mode with a typical shutdown current of 10 μA. Shutdown is enabled by applying a logic low to the SD pin. 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 during activation and deactivation.
●Other included features to simplify system level integration of the SSM3302 are input low-pass filtering to suppress out-ofband DAC noise interference to the pulse density modulator, fixed input impedance to simplify component selection across multiple platform production builds, and a thermal warning indicator pin.
●The SSM3302 is specified over the commercial temperature range (−40°C to +85°C). It has built-in thermal shutdown and output short-circuit protection. It is available in a halide-free, 40-lead, 6 mm × 6 mm lead frame chip scale package (LFCSP).
●APPLICATIONS
● Mobile computing
● Flat panel televisions
● Media docking stations
● Portable electronics
● Sound bars
●### Features and Benefits
● Filterless stereo Class-D amplifier with Σ-Δ modulation
● 2 × 10 W into 4 Ω load and 2 × 8 W into 8 Ω load at 12 V supply with <1% total harmonic distortion plus noise (THD + N)
● 91% efficiency at 12 V, 8 W into 8 Ω speaker
● 98 dB signal-to-noise ratio (SNR)
● Single-supply operation from 7 V to 18 V
● Flexible gain adjustment pin from 9 dB to 24 dB
● Fixed input impedance of 40 kΩ
● See data sheet for additional features
