This evaluation board features the MAX9708 IC, a high-efficiency Class D audio power amplifier from Analog Devices (formerly Maxim Integrated) that requires minimal components.
The MAX9708 is a high-efficiency, Class D audio power amplifier IC from Analog Devices/Maxim Integrated designed for stereo or mono applications, commonly used in flat-panel TVs, automotive systems, and portable audio systems. It delivers up to 2 x 21W into 8Ω (stereo) or 1 x 42W into 4Ω (mono) from a single 10V to 18V supply
| Feature | Benefit |
|---|---|
| High Efficiency & Performance | Up to 87% efficiency with low 0.1% THD+N, providing Class AB performance with Class D benefits. |
| Filterless Design | Reduces component count and saves board space, crucial for compact designs. |
| Spread-Spectrum Modulation | Reduces EMI emissions, eliminating the need for bulky output filters. |
| Operating Modes | Switchable between stereo (2 x 21W) and mono (1 x 42W) modes. |
| Flexible Gain Settings | Four selectable-gain settings (22dB, 25dB, 29.5dB, and 36dB). |
| Protection & Diagnostics | Features thermal-overload and short-circuit protection, along with a programmable thermal flag. |
| System Synchronization | Includes a sync input/output (600kHz to 1.2MHz) to cascade multiple units. |
| Specification | Details |
|---|---|
| Output Power | 2 x 21W (8Ω, 10% THD+N) / 1 x 42W (4Ω, 10% THD+N) |
| Supply Voltage | +10V to +18V (Single Supply) |
| Package Type | 56-pin TQFN (8mm x 8mm x 0.8mm) with exposed pad |
| Operating Temperature | -40°C to +85°C |
| G1 | G2 | Gain (dB) |
|---|---|---|
| R12 | R14 | 22 |
| R11 | R14 | 25 |
| R11 | R13 | 29.5 |
| R12 | R13 | 36 |
Note: Populate the designated slots with 10kΩ 0402 resistors to set the desired gain. See the back side of the board.