LMV1088 Datasheet, PDF (1/30 Pages) National Semiconductor (TI) – Dual Input, Far Field Noise Suppression Microphone Amplifier with Automatic Calibration Ability

LMV1088
www.ti.com
SNAS385J – SEPTEMBER 2007 – REVISED APRIL 2013
LMV1088 Dual Input, Far Field Noise Suppression Microphone Amplifier with Automatic
Calibration Ability
Check for Samples: LMV1088
FEATURES
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•2 Low Power Consumption
• No Added Processing Delay
• Automatic Calibration
• Space-Saving 36 Bump DSBGA Package
• Up to 20dB SNRI
APPLICATIONS
• Mobile Handsets
• Mobile and Handheld Two-Way Radios
• Bluetooth and Other Powered Headsets
• Hand-Held Voice Microphones
• Portable Public Address Systems
KEY SPECIFICATIONS
• (3.3V Supply, Unless Otherwise Specified)
• Supply Voltage 2.7V to 5.5 V
• Supply Current 1mA (typ)
• Signal to Noise Ratio (A-Weighted) 60 dB (typ)
• Total Harmonic Distortion 0.1% (typ)
• Noise Cancellation 20 dB (typ)
• PSRR 85 dB (typ)
DESCRIPTION
The LMV1088 amplifies near-field voice signals within
4cm of the microphones while rejecting far-field
acoustic noise greater than 0.5m from the
microphones. Up to 20dB of far-field rejection is
possible in a properly configured and calibrated
system.
Part of the Powerwise® family of energy efficient
solutions, the LMV1088 consumes 1mA of supply
current while providing superior performance to DSP
solutions consuming over 10 times the power.
A fast calibration during the manufacturing test
process allows the LMV1088 to compensate the
entire microphone system. This calibration includes
mismatch in microphone gain and frequency
response, as well as acoustical path variances. The
LMV1088 stores the calibration coefficients in on-
board EEPROM. The calibration is initiated by I2C
command or by pin control.
The dual microphone inputs are differential to provide
excellent noise immunity. The microphones are
biased with an internal low-noise bias supply.
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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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