LMV1090 Datasheet | National Semiconductor Corporation

LMV1090 Dual Input, Far Field Noise Suppression Microphone Amplifier .. PRELIMINARY July 1, 2009 Dual Input, Far Field Noise Suppression Microphone Amplifier General Description The LMV1090 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 munication applications. The LMV1090 preserves near-field voice signals within 4cm of the microphones while rejecting far-field acoustic noise greater than 50cm from the microphones. Up to 20d B of farfield rejection is possible in a properly configured and using ±0.5d B matched micropohones. Part of the Powerwise™ family of energy efficient solutions, the LMV1090 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. Key Specifications - - - - - - - Far Field Noise Suppression Electrical - SNRIE Supply current Standby current Signal-to-Noise Ratio (Voice band) Total Harmonic Distortion + Noise PSRR (217Hz) 34d B (typ) 26d B (typ) 600μA (typ) 0.1μA (typ) 65d B (typ) 0.1% (typ) 99d B (typ)   - FFNSE at f = 1k Hz Features - - - - - - - - No loss of voice intelligibility No added processing delay Low power consumption Differential outputs Excellent RF immunity Adjustable 12 - 54d B gain Shutdown function Space-saving 16- bump micro SMD package Applications - - - - - Mobile headset Mobile and handheld two-way radios Bluetooth and other powered headsets Hand-held voice microphones Cell phones System Diagram © 2009 National Semiconductor Corporation .national. .. Typical...