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Tiny, Cost-Effective, Plug-and-Play Digital Class-D Amplifier

One-of-a-Kind Filterless, High-Performance Class-D Amplifier in a Tiny WLP Package with no Vias or Programming Required

Product Details

Key Features

Simplified Block Diagram

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Key Features

  • Simple Plug-and-Play Design
  • Single-Supply Operation (2.5V to 5.5V)
  • 3.2W Output Power into 4Ω at 5V
  • 2.2mA Quiescent Current
  • 1ms Turn-On Time (for MAX98361A and MAX98361B)
  • 92% Efficiency (RL = 8Ω, THD+N = 10%)
  • 10μVRMS Output Noise
  • 110dB Dynamic Range
  • Low 0.009% THD+N at 1kHz
  • No MCLK Required
  • Sample Rates of 8kHz to 96kHz
  • Supports Left, Right, or (Left/2 + Right/2) Output in I2S and Left-Justified Modes
  • Sophisticated Edge Rate Control Enables Filterless Class-D Outputs
  • 81dB PSRR at 217Hz
  • 1.5μA Standby Current Allows Elimination of GPIO for EN Pin
  • Low RF Susceptibility Rejects TDMA Noise from GSM Radios
  • Class-D Switching Frequency Trimmed to 5% for Better EMI Planning
  • Extensive Click-and-Pop Reduction Circuitry
  • Robust Short-Circuit and Thermal Protection
  • Available in Space-Saving Package: 9-Pin WLP (0.4mm Pitch) 
  • 3.69mm2 Solution Size for WLP With A Single Bypass Capacitor

Applications/Uses

  • Single Li-ion Cell/5V Devices
  • Smart Speakers
  • Notebook Computers
  • IoT Devices
  • Gaming Devices (Audio and Haptics)
  • Smartphones
  • Tablets
  • Cameras

Description

The MAX98361A/B/C/D is an easy-to-use, low-cost, digital pulse-code modulation (PCM) input Class-D amplifier that provides industry-leading, Class-AB audio performance with Class-D efficiency. The digital audio interface automatically recognizes different PCM and TDM clocking schemes which eliminates the need for I2C programming. Simply supply power, LRCLK, BCLK, and digital audio to generate audio. Furthermore, a novel pinout allows customers to use the cost-effective WLP package with no need for expensive vias.

The digital audio interface is highly flexible. The devices support I2S, left-justified, and 8-channel time division multiplexed (TDM) data formats. The digital audio interface accepts 8kHz, 16kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, and 96kHz 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 1.2V and 1.8V logic. The devices can tolerate logic input voltages up to 5.5V.

The MAX98361A and MAX98361B have fast 1ms turn-on times while the MAX98361C and MAX98361D ramp the volume over 13ms 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 (12ns, 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 devices are specified over the -40°C to +85°C temperature range.

Simplified Block Diagram

MAX98361: Simplified Block Diagram MAX98361: Simplified Block Diagram Zoom icon

Technical Docs

Support & Training

Search our knowledge base for answers to your technical questions.

Filtered Search

Our dedicated team of Applications Engineers are also available to answer your technical questions. Visit our support portal .