1FEATURES

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 (FFNSE

at f = 1kHz): 34dB (typ)

• SNRIE: 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.