话筒放大器带AGC和低噪声麦克风偏置 Microphone Amplifier with AGC and Low-Noise Microphone Bias
General Description
The MAX9814 is a low-cost, high-quality microphone amplifier with automatic gain control AGC and low noise microphone bias. The device features a low-noise preamplifier, variable gain amplifier VGA, output amplifier, microphone-bias-voltage generator and AGC control circuitry.
Features
♦Automatic Gain Control AGC
♦Three Gain Settings 40dB, 50dB, 60dB
♦Programmable Attack Time
♦Programmable Attack and Release Ratio
♦2.7V to 5.5V Supply Voltage Range
♦Low Input-Referred Noise Density of 30nV/√Hz
♦Low THD: 0.04% typ
♦Low-Power Shutdown Mode
♦Internal Low-Noise Microphone Bias, 2V
♦Available in the Space-Saving, 14-Pin TDFN 3mm x 3mm Package
♦-40°C to +85°C Extended Temperature Range
Applications
Digital Still Cameras
Digital Video Cameras PDAs
Bluetooth Headsets
Entertainment Systems e.g., Karaoke
Two-Way Communicators
High-Quality Portable Recorders
IP Phones/Telephone Conferencing