LMV1099
Dual input microphone preamp with far field noise suppression, SNR enhancement & earpiece driver
LMV1099
- 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
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)
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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.
Technical documentation
| Type | Title | Date | ||
|---|---|---|---|---|
| * | Data sheet | Uplink Far Field Noise Suppression and Downlink SNR Enhancing Microphone Amp datasheet (Rev. D) | 02 May 2013 |
Ordering & quality
- RoHS
- REACH
- Device marking
- Lead finish/Ball material
- MSL rating/Peak reflow
- MTBF/FIT estimates
- Material content
- Qualification summary
- Ongoing reliability monitoring
- Fab location
- Assembly location