MAX98360 Cost-Effective, Plug-and-Play Digital Class-D Amplifiers

Analog Devices' MAX98360x easy-to-use, low-cost, digital pulse-code modulation (PCM) input Class-D amplifiers provide Class-AB audio performances with Class-D efficiency. The digital audio interface automatically recognizes different PCM and time division multiplexed (TDM) clocking schemes, which eliminates the need for I²C programming. Simple supply power, LRCLK, BCLK, and digital audio to generate audio. A novel pinout allows customers to use the cost-effective WLP package with no need for expensive vias. The MAX98360A and MAX98360B have fast 1 ms turn-on times while the MAX98360C and MAX98360D ramp the volume over 13 ms during turn-on and turn-off.

The devices eliminate the need for the external MCLK signal that is typically used for PCM communication. This reduces EMI and possible board coupling issues in addition to reducing the size and pin count. The devices also feature a very high wideband jitter tolerance (12 ns, typ) on BCLK and LRCLK to provide robust operation.

Active emissions-limiting, edge-rate limiting, and overshoot control circuitry greatly reduce EMI. A filterless spread-spectrum modulation scheme eliminates the need for output filtering found in traditional Class-D devices and reduces the component count of the solution.

The digital audio interface is highly flexible. The devices support I²S, left-justified, and 8-channel TDM data formats. The digital audio interface accepts 8 kHz, 16 kHz, 32 kHz, 44.1 kHz, 48 kHz, 88.2 kHz, and 96 kHz sample rates. Data words can be 16-bit, 24-bit, or 32-bit in I²S and left-justified modes and 16-bit or 32-bit in TDM mode.

Digital audio interface input thresholds are ideal for interfacing to 1.2 V and 1.8 V logic. The devices can tolerate logic input voltages up to 5.5 V.

The devices are specified over the -40°C to +85°C temperature range.