The MAX98366 is an easy-to-use, low-cost, digital 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, eliminating the need for I2C programming: Simply supply power, LRCLK, BCLK, and digital audio to generate sound. Furthermore, a novel pinout allows customers to use the cost-effective wafer-level package (WLP) without needing expensive in-pad vias. A wide 3V to 15V supply range allows the device to deliver 15W into an 8Ω load.
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, 96kHz, 176.4kHz, and 192kHz sample rates. The device supports ultrasound use cases and automatically provides a 38.8kHz and higher passband for digital audio input signals at sample rates higher than 48kHz (nominal). Data words can be 16-, 24-, or 32-bit in I2S and left-justified modes and 16- 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 MAX98366A and MAX98366B have fast 1ms turn-on times while the MAX98366C and MAX98366D ramp the volume over 13ms during turn-on and turn-off.
The devices eliminate the need for the external MCLK signal 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.
Applications
- Smart Speakers
- Wireless Speakers
- Smart IoT and Smart Home Devices
- Gaming Devices (Audio and Haptics)
- Laptops and Tablets
- Cameras
