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.