Analog Devices Inc./Maxim Integrated MAX9718AEVKIT

Overview

The MAX9718AEVKIT from Maxim Integrated is a fully assembled and tested evaluation kit for the MAX9718A differential audio amplifier, configured as a mono bridge-tied load (BTL) driver delivering 1.1W into 8Ω at 1% THD+N, operating from 2.7V to 5.5V, and supporting DC-coupled inputs with ±0.5V to (V_CC−1.2V) input offset tolerance for portable audio systems.

For engineers reviewing the MAX9718AEVKIT datasheet, MAX9718AEVKIT pinout, MAX9718AEVKIT application, or MAX9718AEVKIT equivalent, this board enables rapid validation of BTL audio performance, shutdown mode configuration (SHDN/SHDM), gain adjustment via external resistors, and optional low-pass filtering-critical for portable speaker, headphone amplifier, and battery-powered audio subsystem design.

Technical Context

The MAX9718AEVKIT implements the MAX9718A IC in a fixed-gain (1V/V) BTL configuration using four 10kΩ gain-setting resistors (R1–R4), with jumper-selectable shutdown control (JU1/JU2) determining SHDN polarity and activation state, and configurable input coupling (JU3/JU4) enabling either AC- or DC-coupled signal paths based on source offset compliance.

It supports evaluation of four variants (MAX9718A/B/C/D) via component replacement per Table 3, where U1 IC swap and resistor reconfiguration (e.g., R1/R3 = 0Ω, R2/R4 open for MAX9718B) adapt gain and bias settings per variant's internal architecture-without PCB redesign.

Key Specifications

Availability

MAX9718AEVKIT is available at Aetrix Electronics and suitable for portable audio development, battery-powered speaker prototyping, and audio amplifier qualification requiring stable component supply and verified reference design implementation.

Supply support for MAX9718AEVKIT 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) designs precision analog, mixed-signal, and power management ICs for industrial, automotive, communications, and consumer applications.

The MAX9718 family targets low-voltage, high-efficiency mono Class AB audio amplifiers for space-constrained portable electronics, emphasizing capacitor-free inputs, low quiescent current, and flexible gain configuration.

FAQ

What is the primary function of the MAX9718AEVKIT?

The MAX9718AEVKIT is a ready-to-use evaluation platform for the MAX9718A differential audio amplifier. It provides a validated BTL output stage driving up to 1.1W into 8Ω, with configurable shutdown, gain, and input coupling. Engineers use the MAX9718AEVKIT to verify real-world audio performance, validate PCB layout decisions, and accelerate integration of the MAX9718A into portable audio products without building custom test hardware.

Can the MAX9718AEVKIT evaluate other ICs besides the MAX9718A?

Yes, the MAX9718AEVKIT supports evaluation of MAX9718B, MAX9718C, and MAX9718D by replacing U1 and adjusting gain-setting resistors per Table 3 in the EV kit documentation. Each variant requires specific resistor configurations (e.g., zero-ohm links or open circuits) to match its internal gain and bias architecture-no PCB modification is needed beyond component-level changes.

How do I configure shutdown mode on the MAX9718AEVKIT?

Shutdown mode on the MAX9718AEVKIT is controlled via jumpers JU1 and JU2. JU1 sets SHDM (shutdown mode select), and JU2 sets SHDN (shutdown enable). For active-low shutdown, install shunts on JU1 pins 1–2 (SHDM = high) and JU2 pins 2–3 (SHDN = low). Table 1 in the MAX9718A EV kit documentation defines all four valid combinations and their functional outcomes.

Does the MAX9718AEVKIT require input coupling capacitors?

No-the MAX9718AEVKIT allows bypassing input coupling capacitors C1 and C2 using jumpers JU3 and JU4. This enables true DC-coupled operation when the input signal's DC offset falls within the MAX9718A's specified range of 0.5V to (V_CC−1.2V), eliminating size, cost, and low-frequency phase shift introduced by external AC-coupling caps-a key advantage for compact portable audio designs using the MAX9718AEVKIT.

What power supply requirements does the MAX9718AEVKIT have?

The MAX9718AEVKIT requires a 2.7VDC to 5.5VDC, 2A capable power supply connected to VCC and GND pads. This range aligns with common portable power sources including single-cell Li-ion (3.0–4.2V) and dual-cell alkaline (3.0–3.6V). The 2A rating ensures headroom for peak transient current during high-output audio bursts, maintaining stable operation across the full output power range of the MAX9718AEVKIT.