ADI SSM3302ACPZ

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.

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. 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. 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. Can pass FCC Class-B emissions testing with an unshielded 20 inch cable using common-mode choke-based filtering.

The fully differential input provides excellent rejection of common-mode noise on the input. 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 devices within a single application compared with using external resistors to set gain.

Includes an integrated voltage regulator that generates a 5 V rail.

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. 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 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.

Specified over the commercial temperature range (-40°C to +85°C). Has built-in thermal shutdown and output short-circuit protection. Available in a halide-free, 40-lead, 6 mm×6 mm lead frame chip scale package (LFCSP).

• Filterless stereo Class-D amplifier with Σ-Δ modulation
• 2×101 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)
• 97% 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
• Mono output mode pin for 1×20 W output power into 2 Ω
• 70 μA shutdown current
• Short-circuit and thermal protection
• Available in a 40-lead, 6 mm × 6 mm LFCSP
• Pop-and-click suppression
• User-selectable ultralow EMI emissions mode
• Thermal warning indicator
• Power-on reset

• Mobile computing
• Flat panel televisions
• Media docking stations
• Portable electronics
• Sound bars