Analog Devices Inc./Maxim Integrated MAX98356EVKIT#

Overview

MAX98356EVKIT# from Maxim Integrated is an evaluation kit for the MAX98356 PDM-input Class D audio power amplifier IC, enabling rapid prototyping of ultra-low-EMI, filterless mono audio output in space-constrained portable devices. It supports 2.5V–5.5V supply, delivers up to 3.2W into 4Ω at 5V, features five programmable gain settings (3dB–15dB), and operates with PDM_CLK rates from 1.84MHz to 8.64MHz.

For engineers reviewing the MAX98356EVKIT# datasheet, MAX98356EVKIT# pinout, MAX98356EVKIT# application, or MAX98356EVKIT# equivalent, this kit provides validated hardware reference design, real-world EMI performance data, stereo-to-mono channel selection via SD_MODE, click-and-pop suppression verification, and direct interface to PDM-capable codecs or SoCs - critical for cellular phone, tablet, and ultrasonic transducer audio subsystem development.

Technical Context

The MAX98356EVKIT# implements the full signal chain of the MAX98356 IC: PDM_DATA and PDM_CLK inputs feed a stereo PDM decoder; SD_MODE configures left/right/summed mono output or shutdown; GAIN selects one of five discrete voltage-gain levels; and the filterless Class D output stage drives OUTP/OUTN differentially into speaker loads without external LC filtering. All digital interface timing - including 10ns setup/hold, 40ns min PDM_CLK high/low time, and 0.5ns/12ns RMS jitter tolerance - is verified on-board.

Power management is fully exercised: quiescent current (1.8mA typ at 3.7V), shutdown current (<0.6µA), and standby mode (300–400µA) are measurable using onboard test points and jumpers. Thermal protection, current limiting (2.8A typ), and robust RF immunity (77dB PSRR at 217Hz, GSM noise rejection) are validated under load across –40°C to +85°C operating range.

Key Specifications

Availability

MAX98356EVKIT# is available at Aetrix Electronics and suitable for cellular phone audio subsystem validation, tablet speaker driver qualification, and ultrasonic transducer excitation circuit development requiring stable component supply and pre-validated layout practices.

Supply support for MAX98356EVKIT# includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Maxim Integrated (now part of Analog Devices) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management solutions for industrial, communications, computing, and consumer applications.

The MAX98356 product line delivers ultra-low-EMI, PDM-input Class D audio amplifiers targeting battery-powered portable electronics where board space, efficiency, and radiated emissions compliance are critical constraints.

FAQ

What is the primary purpose of the MAX98356EVKIT#?

The MAX98356EVKIT# is a fully assembled evaluation kit designed to demonstrate and validate the MAX98356 PDM-input Class D audio amplifier IC. It provides a ready-to-use hardware platform with all necessary decoupling, routing, and test points to evaluate audio performance, EMI behavior, gain configuration, channel selection, and power efficiency - eliminating the need for custom PCB design during early-stage audio subsystem development.

Does the MAX98356EVKIT# support stereo output?

No, the MAX98356EVKIT# evaluates the MAX98356 IC, which is a mono amplifier. It accepts stereo PDM input but outputs only one channel - selectable as left, right, or left/2 + right/2 summed mono via the SD_MODE pin. True stereo operation requires two MAX98356 ICs (e.g., one per channel), as shown in Figure 9 of the MAX98356 datasheet.

Can the MAX98356EVKIT# operate with a 3.3V supply?

Yes, the MAX98356EVKIT# supports the full 2.5V–5.5V input range of the MAX98356 IC. At 3.3V, it delivers approximately 1.4W into 8Ω (THD+N = 1%) and maintains 92% efficiency at 900mW output, with verified low-noise performance (29µV_RMS) and robust PDM clock jitter tolerance (12ns wideband).

How is gain configured on the MAX98356EVKIT#?

Gain on the MAX98356EVKIT# is set by applying specific voltage levels to the GAIN pin of the onboard MAX98356 IC: connect to GND for 12dB, VDD for 6dB, unconnected for 9dB, GND through 100kΩ for 15dB, or VDD through 100kΩ for 3dB. Jumper options or solder pads on the EVKIT allow quick reconfiguration without modifying firmware or external logic.

What EMI mitigation features are validated on the MAX98356EVKIT#?

The MAX98356EVKIT# validates three key EMI-reduction techniques of the MAX98356 IC: (1) spread-spectrum modulation (±10kHz randomization around 300kHz center), (2) active edge-rate limiting on output drivers, and (3) overshoot control circuitry - collectively enabling filterless operation while meeting EN55022B radiated emissions limits, even with 12-inch unshielded speaker cables.