LMV1091 Datasheet | National Semiconductor

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 munication 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 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 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. Key Specifications - - - - - - - - Far Field Noise Suppression Electrical - SNRIE Supply voltage Supply current Standby current Signal-to-Noise Ratio (Voice band) Total Harmonic Distortion + Noise PSRR (217Hz) 34d B (typ) 26d B (typ) 2.7V to 5.5V 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 Low power consumption Shutdown function No added processing delay Differential outputs Adjustable 12 - 54d B gain Excellent RF immunity Available in a 25- bump micro SMD package Applications - - - - .. Mobile headset Mobile and handheld two-way radios Bluetooth and other powered headsets Hand-held voice microphones System Diagram © 2009 National Semiconductor Corporation .national. Typical Application FIGURE 1. Typical Dual Microphone Far Field noise Cancelling Application .. .national. Connection Diagrams 25ump micro SMD package Top View Order Number LMV1091TM See NS Package Number TMD25AAA 25- Bump micro SMD Marking micro SMD Package...