About MAX9814ETD+T

The MAX9814ETD+T is a high-quality microphone amplifier IC with various features designed to enhance audio performance. It incorporates an automatic gain control (AGC) and a low-noise microphone bias, making it suitable for applications that require clear and precise sound reproduction. The device includes a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, microphone-bias voltage generator, and AGC control circuitry.

The low-noise preamplifier offers a fixed 12dB gain, while the VGA gain automatically adjusts from 20 to 0dB based on the output voltage and AGC threshold. This allows for dynamic gain adjustment to maintain consistent audio levels. The output amplifier provides selectable gains of 8, 18, and 28dB, resulting in overall gains of 40, 50, or 60dB when cascaded with other amplifiers. The gain of the output amplifier can be programmed using a tri-level digital input.

The MAX9814ETD+T also features an external resistive divider to control the AGC threshold and a single capacitor to program attack/release times. The AGC hold time is fixed at 30ms. Additionally, it includes a low-noise microphone-bias voltage generator that can bias most electret microphones, enhancing compatibility with different microphone types.

Features

• Automatic Gain Control (AGC): The MAX9814ETD+T incorporates AGC functionality, allowing for automatic adjustment of the gain based on the output voltage and AGC threshold. This ensures consistent audio levels and helps prevent distortion.
• Low-Noise Preamplifier: It includes a low-noise preamplifier with a fixed 12dB gain. This enables amplification of low-level microphone signals while maintaining minimal noise interference.
• Variable Gain Amplifier (VGA): The VGA gain automatically adjusts from 20 to 0dB, providing dynamic gain control based on the input signal level. This allows for flexible adjustment to match different audio requirements.
• Output Amplifier: The output amplifier provides selectable gains of 8, 18, and 28dB. When cascaded with other amplifiers, these gains result in overall gains of 40, 50, or 60dB. The gain can be programmed using a tri-level digital input.
• Microphone-Bias Voltage Generator: The MAX9814ETD+T includes a low-noise microphone-bias voltage generator that can bias most electret microphones. This enhances compatibility with various microphone types.

Specifications

Applications

• Audio Recording Devices: The MAX9814ETD+T is suitable for use in audio recording devices such as digital voice recorders, portable audio recorders, and microphone preamp systems. It ensures high-quality sound capture and amplification.
• Communication Equipment: It can be utilized in communication equipment, including teleconferencing systems, voice communication devices, and intercom systems. The AGC functionality helps maintain clear audio signals during communication.
• Voice Recognition Systems: The low-noise preamplifier and variable gain control make it well-suited for voice recognition applications. It can amplify and enhance input signals for accurate voice detection and processing.
• Consumer Electronics: The MAX9814ETD+T can be integrated into various consumer electronic devices, such as smartphones, tablets, and laptops, to improve microphone performance and ensure better audio quality during voice calls or multimedia recording.

Datasheet Download: MAX9814ETD+T Datasheet

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