NATIONAL SEMICONDUCTOR LMV1089 User's Manual
Summary
The LMV1089 is a professional-grade dual-input amplifier designed for superior voice communication clarity by incorporating Clarisound™ far field noise suppression technology. It automatically calibrates to drastically reduce background acoustic noise while perfectly preserving delicate near-field speech signals. For system designers, this manual provides critical specifications, pinout guides, and application circuits necessary for integrating the chip into mobile radios, dedicated headsets, and high-quality voice communication equipment requiring exceptional noise immunity.
Page 1 Text Content
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October 24, 2008
LMV1089 Dual Input, Clarisound™ Far Field Noise Suppression Microphone Amplifier with Automatic Calibration Capability General Description Key Specifications
The LMV1089 is a fully analog dual differential input, differ- Far Field Noise Suppression Electrical 33d B
ential output, microphone array amplifier designed to reduce Supply voltage 2.7V to 5.5V background acoustic noise, while delivering superb speech Supply current 1.1m A (typ) clarity in voice communication applications.
Standby current 0.7μA (typ)
The LMV1089 preserves near-field voice signals within 4cm Signal-to-Noise Ratio (A-weighted) 65d B (typ) of the microphones while rejecting far-field acoustic noise
Total Harmonic Distortion + Noise 0.1% (typ)
greater than 50cm from the microphones. Up to 20d B of far-
PSRR (217Hz) 96d B (typ)
field rejection is possible in a properly configured and cali- brated system.
Features
Part of the Powerwise™ family of energy efficient solutions,
the LMV1089 consumes only 1.1m A of supply current pro- Low power consumption
viding superior performance over DSP solutions consuming Shutdown function greater than ten times the power.
No added processing delay
A quick calibration during the manufacturing test process of
Differential outputs
a product containing the LMV1089 compensates the entire
Automatic calibration
microphone system. This calibration compensates for mis-
Adjustable 6 - 48d B gain
match in microphone gain and frequency response, as well
as acoustical path variances. The LMV1089 stores the cali- Excellent RF immunity
bration coefficients in the on-chip EEPROM. The calibration Space-saving 36–bump micro SMD package is initiated by an I2C command or by a logic pin control. The dual microphone inputs and the processed signal output Applications are differential to provide excellent noise immunity. The mi-
Headset and Boom microphones
crophones are biased with an internal low-noise bias supply.
Mobile and handheld two-way radios Bluetooth and other powered headsets Hand-held voice microphones Equalized stereo microphone preamplifier
FIGURE 1.
© 2008 National Semiconductor Corporation www.national.com
Page Summary Contents For NATIONAL SEMICONDUCTOR LMV1089 User's Manual
Manual Details
| Brand | National |
|---|---|
| Pages | 30 |
| File Size | 1.41 MB |
| Published | June 17, 2026 |
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Frequently Asked Questions
How does the LMV1089 handle background noise?
It uses Clarisound™ Far Field Noise Suppression to reduce acoustic noise while preserving near-field voice signals within 4cm.
Is manual calibration needed for optimal microphone performance?
No; Automatic Calibration compensates for differences in gain and frequency response across the dual microphones.
What is the power efficiency of this amplifier?
It consumes only 1.1mA of supply current, providing superior performance over high-consumption DSP solutions.