LMV1091 Datasheet, PDF (1/22 Pages) National Semiconductor (TI) – Dual Input, Far Field Noise Suppression Microphone Amplifier

LMV1091
www.ti.com
SNAS481C – OCTOBER 2009 – REVISED MAY 2013
LMV1091 Dual Input, Far Field Noise Suppression Microphone Amplifier
Check for Samples: LMV1091
FEATURES
1
•2 No Loss of Voice Intelligibility
• Low Power Consumption
• Shutdown Function
• No added Processing Delay
• Differential Outputs
• Adjustable 12 - 54dB Gain
• Excellent RF Immunity
• Available in a 25–Bump DSBGA Package
APPLICATIONS
• Mobile Headset
• Mobile and Handheld Two-way Radios
• Bluetooth and Other Powered Headsets
• Hand-held Voice Microphones
KEY SPECIFICATIONS
• Far Field Noise Suppression Electrical (FFNS_E
at f = 1kHz): 34dB (typ)
• SNRI_E: 26dB (typ)
• Supply Voltage: 2.7V to 5.5V
• Supply Current: 600μA (typ)
• Standby Current: 0.1μA (typ)
• Signal-to-Noise Ratio (Voice band): 65dB (typ)
• Total Harmonic Distortion + Noise: 0.1% (typ)
• PSRR (217Hz): 99dB (typ)
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.
1
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2
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
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