Analog Devices / Maxim Integrated MAX98360A/B/C/D Digital Class-D Amplifiers
Analog Devices Inc. MAX98360A/B/C/D Digital Class-D Amplifiers are easy-to-use, low-cost, digital pulse-code modulation (PCM) input Class-D amplifiers. These amplifiers provide 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. By supplying power, LRCLK, BCLK, and digital audio generates audio. Furthermore, a novel pinout allows customers to use the cost-effective WLP package without needing 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, left-justified modes, and 16-bit or 32-bit in TDM mode.
Digital audio interface input thresholds are ideal for interfacing with 1.2V and 1.8V logic. The devices can tolerate logic input voltages up to 5.5V. The MAX98360A and MAX98360B have fast 1ms turn-on times, while the MAX98360C and MAX98360D 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, possible board coupling issues, and 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 reduces 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. ADI MAX98360A/B/C/D Digital Class-D Amplifiers are specified over the -40°C to +85°C temperature range.
Features
- Simple Plug-and-Play design
- 2.5V to 5.5V Single-supply operation
- 3.2W output power into 4Ω at 5V
- 2.2mA quiescent current
- 1ms turn-on time (for MAX98360A and MAX98360B)
- 92% efficiency (RL = 8Ω, THD+N = 10%)
- 10μVRMS output noise
- 110dB dynamic range
- Low 0.009% THD+N at 1kHz
- No MCLK required
- 8kHz to 96kHz sample rates
- 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 the 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 9-pin WLP (0.4mm pitch)
- 3.69mm2 solution size for WLP with a single bypass capacitor
Applications
- Single Li-ion cell/5V devices
- Smart speakers
- Notebook computers
- IoT devices
- Gaming devices (audio and haptics)
- Smartphones
- Tablets
- Cameras
Associated Development Tool
Analog Devices / Maxim Integrated MAX98360xEVSYS評估系統
全面組裝和測試的系統，用於評估MAX98360A/B/C/D單聲道D級音頻放大器。
Functional Diagram
