Digital Class D speaker amplifiers aim to simplify design and provide unmatched audio performance

September 26, 2012 // By Paul Buckley
Maxim Integrated Products, Inc., has introduced two digital-input Class D power amplifiers that simplify designs, eliminate complicated programming, reduce noise, and hasten time to market.

The MAX98355 (pulse-code modulation, PCM) and MAX98356 (pulse-density modulation, PDM) offer best-in-class clock jitter tolerance in Class D audio amplifiers and deliver superior audio quality.

Audio devices can now be simplified because internal circuitry in the MAX98355/MAX98356 detects the input clock and automatically calculates the sample rate. This reduces complicated programming and the need for system software support. With a digital input for noise immunity, and high jitter tolerance, these parts provide superior audio quality while eliminating the need for programming for a faster time to market.  

The MAX98355 offers excellent audio quality with a high jitter tolerance: low 0.013% THD+N at 1 kHz and 99 dB dynamic range.  The device delivers lower power consumption: 92% efficiency (RL = 8 Ω, POUT = 900 mW, VDD = 3.7 V).  

Availability and Pricing

The MAX98355 digital-input Class D power amplifiers are available in a 9-pin WLP package (1.345 mm x 1.435 mm x 0.64 mm).  The device is specified over the -40 to +85°C temperature range.  Pricing starts at $0.82 (1000-up, FOB USA).

For more information about the MAX98355 digital-input Class D power amplifiers at www.maximintegrated.com/datasheet/index.mvp/id/7502