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FEATURES

? Noise Reduction Without DSP-Type Artifacts

? Adapting AGC (Automatic Gain Control) on

Ambient Noise Level and Downlink Signal

Strength

? Downlink Adjustable Noise-reducing High

Pass Filter

? Separate Uplink and Downlink Enable

Functions

? No Added Process Delays

? Low Power Consumption

? Shutdown Function

? Maximum AGC Limiter

? Differential Inputs and Outputs for Noise

Immunity

? Earpiece Amplifier

? Available in a 25-Bump DSBGA Package

APPLICATIONS

? Mobile Handsets

? Mobile and Handheld Two-Way Radios all?

Bluetooth and Other Power Headsets

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 0.06μA (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)

DESCRIPTION

The LMV1099 is an uplink and downlink voice

intelligibility enhancing analog IC, ideally suited for

mobile handsets. Uplink voice intelligibility is

improved by rejecting far-field noise through a unique

two-microphone solution. Downlink voice intelligibility

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

Ratio) between the downlink voice and the ambient

noise environment at the user’s earpiece.

The LMV1099 preserves uplink near-field voice

signals within close range of the microphones while

rejecting far-field acoustic noise greater than 0.5m

from the microphones.

The LMV1099 also enhances downlink voice

intelligibility by improving near-field SNR based on

the user’s environment. The analog circuitry adapts

dynamically to both the user’s ambient noise

environment as well as the downlink signal amplitude

to ensure optimum SNRI (signal-to-noise ratio

improvement). The downlink path also provides uplink

noise attenuation through an adjustable high pass

filter before the SNR enhanced downlink voice

reaches the user’s earpiece.

Unlike digital-based noise reduction solutions, the all?

analog low power consuming LMV1099 increases

both uplink and downlink voice intelligibility without

DSP-type artifacts, distortions or processing delays.