MAX4298ESD+

Audio Special Purpose Overview

The MAX4298ESD+ is a stereo headphone driver IC designed for single +5V applications in noisy digital environments. It features ultra-high power-supply rejection (115dB DC, 93dB at 20kHz) and rail-to-rail output drive capability. The device operates within a supply voltage range of 4.5V to 5.5V and supports an operating temperature range of -40°C to +85°C. It delivers 1.5VRMS into a 10kΩ load with 0.0008% THD+N and drives 32Ω headphones to 1.2VRMS with 0.02% distortion. The unit is housed in a 14-pin SO package.

Audio Special Purpose Feature Summary

• Ultra-High PSRR: 115dB DC and 93dB at 20kHz for operation from noisy digital supplies
• PC99-Compliant Drivers: Delivers >1VRMS into 16Ω and 1.5VRMS into 10kΩ with low distortion
• Clickless/Popless Operation: Features popless power-up, power-down, mute, and unmute sequences
• High Capacitive Drive: Capable of driving up to 22nF capacitive loads

Audio Special Purpose Applications

• Notebook and Desktop Audio Systems
• Hands-Free Headsets
• USB Audio Peripherals
• IP Telephones
• Wireless Internet Devices

Audio Special Purpose Procurement Notes

Verify the specific ordering suffix 'ESD' corresponds to the 14-pin SO package and -40°C to +85°C temperature range as listed in the official Maxim Integrated ordering information. Confirm that the component matches the MAX4298 variant, which includes only the stereo headphone driver without the microphone amplifier or linear regulator found in the MAX4299.

Audio Special Purpose Selection Notes

Select this component when board space is limited and the digital power supply is noisy. Ensure the application requires a stereo headphone driver with high PSRR. Verify that the load impedance and capacitive requirements are within the specified limits for stable operation. Check if additional features like a microphone amplifier or regulator are needed, which would require the MAX4299 instead.

Audio Special Purpose Part Context

The MAX4298 is part of the MAX4298/MAX4299 family of audio system ICs designed for harsh digital environments. While the MAX4299 integrates a stereo headphone driver, a microphone amplifier, and a 100mA linear regulator, the MAX4298 provides only the stereo headphone driver functionality. Both share the same core architecture for ultra-high PSRR and clickless/popless performance.

Audio Special Purpose Replacement Considerations

The MAX4298EUB+ is a pin-compatible alternative available in a 10-pin µMAX package. Designers must verify footprint compatibility and ensure that the reduced pin count does not impact external component connections or thermal dissipation requirements.