LMV1091中文资料具有噪声抑制功能的双输入麦克风前置放大器数据手册TI规格书

描述 Description

The LMV1091 is a fully analog dual differential input, differential output, microphone array amplifier designed to reduce background acoustic noise, while delivering superb speech clarity in voice communication applications. The LMV1091 preserves near-field voice signals within 4cm of the microphones while rejecting far-field acoustic noise greater than 50cm from the microphones. Up to 20dB of far-field rejection is possible in a properly configured and using ±0.5dB matched micropohones. Part of the Powerwise™ family of energy efficient solutions, the LMV1091 consumes only 600μA of supply current providing superior performance over DSP solutions consuming greater than ten times the power. The dual microphone inputs and the processed signal output are differential to provide excellent noise immunity. The microphones are biased with an internal low-noise bias supply.

特性 Features

• No Loss of Voice Intelligibility
• Shutdown Function
• Differential Outputs
• Excellent RF Immunity
• Far Field Noise Suppression Electrical (FFNSE at f = 1kHz): 34dB (typ)
• Supply Voltage: 2.7V to 5.5V
• Standby Current: 0.1μA (typ)
• Total Harmonic Distortion + Noise: 0.1% (typ)
• PSRR (217Hz): 99dB (typ)