LMV1099

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SNAS490D – JULY 2010 – REVISED MAY 2013

LMV1099 Uplink Far Field Noise Suppression and Downlink SNR Enhancing Microphone

Amplifier with Earpiece Driver

Check for Samples: LMV1099

1

FEATURES

DESCRIPTION

The LMV1099 is an uplink and downlink voice

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•

Noise Reduction Without DSP-Type Artifacts

intelligibility enhancing analog IC, ideally suited for

•

Adapting AGC (Automatic Gain Control) on

mobile

handsets.

Uplink

voice

intelligibility

is

Ambient Noise Level and Downlink Signal

improved by rejecting far-field noise through a unique

Strength

two-microphone solution. Downlink voice intelligibility

is improved by enhancing the SNR (Signal-to-Noise

•

Downlink Adjustable Noise-reducing High

Ratio) between the downlink voice and the ambient

Pass Filter

noise environment at the user’s earpiece.

•

Separate Uplink and Downlink Enable

Functions

The LMV1099 preserves uplink near-field voice

signals within close range of the microphones while

•

No Added Process Delays

rejecting far-field acoustic noise greater than 0.5m

•

Low Power Consumption

from the microphones.

•

Shutdown Function

The

LMV1099

also

enhances

downlink

voice

•

Maximum AGC Limiter

intelligibility by improving near-field SNR based on

•

Differential Inputs and Outputs for Noise

the user’s environment. The analog circuitry adapts

dynamically

to

both

the

user’s

ambient

noise

Immunity

environment as well as the downlink signal amplitude

•

Earpiece Amplifier

to

ensure

optimum

SNRI

(signal-to-noise

ratio

•

Available in a 25-Bump DSBGA Package

improvement). The downlink path also provides uplink

noise attenuation through an adjustable high pass

APPLICATIONS

filter before the SNR enhanced downlink voice

reaches the user’s earpiece.

•

Mobile Handsets

Unlike digital-based noise reduction solutions, the all-

•

Mobile and Handheld Two-Way Radios

analog low power consuming LMV1099 increases

•

Bluetooth and Other Power Headsets

both uplink and downlink voice intelligibility without

DSP-type artifacts, distortions or processing delays.

KEY SPECIFICATIONS

•

Uplink Far Field Noise Suppression (Electrical

FFNSE at f = 1kHz) 33dB (typ)

•

Near-Field SNR Enhancement 6 to 18dB (typ)

•

Downlink SNRIE 16dB (typ)

•

Supply Voltage Range 2.7V to 5.5V

•

Supply Current (VDD = 3.6V) 3.8mA (typ)

•

Shutdown Current 0.06

μA (typ)

•

Uplink PSRR (f = 217Hz) 106dB (typ)

•

Downlink SNR (A-weighted) 102dB (typ)

•

Downlink THD+N 0.03% (typ)

•

Earpiece Output Power (RL = 32Ω) 83mW (typ)

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PRODUCTION DATA information is current as of publication date.

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Products conform to specifications per the terms of the Texas

Instruments standard warranty. Production processing does not

necessarily include testing of all parameters.