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MAX98361A/B/C/D Plug-and-Play Digital Class-D Amplifier
Analog Device's MAX98361 is a one-of-a-kind filterless, high-performance, plug-and-play digital Class-D amplifier
Analog Devices' MAX98361A, MAX98361B, MAX98361C, and MAX98361D are an easy-to-use, low-cost, digital pulse-code modulation (PCM) input Class-D amplifiers providing 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 audio. Furthermore, a novel pinout allows users to use the cost-effective WLP package without 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 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 MAX98361A and MAX98361B have fast 1 ms turn-on times, while the MAX98361C and MAX98361D ramp the volume over 13 ms during turn-on and turn-off.
The devices eliminate the need for the external MCLK signal for PCM communication, reducing EMI and possible board coupling issues in addition to 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 devices are specified over the -40°C to +85°C temperature range.
- Simple plug-and-play design
- Single-supply operation (2.5 V to 5.5 V)
- 3.2 W output power into 4 Ω at 5 V
- 2.2 mA quiescent current
- 1 ms turn-on time (for MAX98361A and MAX98361B)
- 92% efficiency (RL = 8 Ω, THD+N = 10%)
- 10 μVRMS output noise
- 110 dB dynamic range
- Low 0.009% THD+N at 1 kHz
- No MCLK required
- Sample rates of 8 kHz to 96 kHz
- Available in space-saving package: 9-pin WLP (0.4 mm pitch)
- 3.69 mm2 solution size for WLP with a single bypass capacitor
- Supports left, right, or (Left/2 + Right/2) output in I2S and left-justified modes
- Sophisticated edge rate control enables filterless Class-D outputs
- 81 dB PSRR at 217 Hz
- 1.5 μA 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
- Single Li-ion cell/5 V devices
- Smart speakers
- Notebook computers
- IoT devices
- Gaming devices (audio and haptics)
- Smartphones
- Tablets
- Cameras
Evaluation Boards
| Image | Manufacturer Part Number | Description | Available Quantity | Price | View Details | |
|---|---|---|---|---|---|---|
 |  | MAX98361AEVSYS#WLP | EVAL BOARD FOR MAX98361A | 0 - Immediate 11 - Factory Stock | $257.42 | View Details |
