Low-Cost, High-Quality Microphone Amplifier Integrates AGC to Minimize Audio Signal Losses
Note to Editor:
- The MAX9814 is a high-quality microphone amplifier with integrated low-noise microphone bias.
- This amplifier minimizes audio signal losses.
- It achieves this audio performance by integrating automatic gain control (AGC) circuitry that enables designers to set the gain for different audio applications.
- The MAX9814 is ideal for digital still/video cameras, Bluetooth headsets, high-quality portable recorders, and IP-based telephones.
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SUNNYVALE, CA—May 2, 2007—Maxim Integrated Products (NASDAQ: MXIM) introduces the MAX9814 low-cost, high-quality microphone amplifier with automatic gain control (AGC) and low-noise microphone bias. The integrated AGC circuitry allows the designer to define hold and release times, as well as the output threshold level. Optimizing the signal level prior to digital signal processing ensures a low-noise signal that does not require further gain or attenuation. This high-quality audio signal can be converted and processed in the digital domain without further losses, thereby preserving the quality of the original audio. To further enhance audio performance, this device integrates a low-noise preamplifier, variable gain amplifier (VGA), output amplifier, and an internal low-noise microphone-bias-voltage generator that is capable of driving most electret condenser microphones. The MAX9814 is ideal for digital cameras, portable recorders, Bluetooth® and wired headsets, VoIP phones, and conference phones.
Fully specified over the -40°C to +85°C extended temperature range, the MAX9814 is available in space-saving, 1.5mm x 2mm, 12-bump UCSP and 3mm x 3mm, 14-pin TDFN packages. An evaluation kit is available to speed design implementation. Prices start at $0.59 (10,000-up, FOB USA).
Bluetooth is a registered trademark of Bluetooth SIG.
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