Features
| • | Low power consumption |
| • | No added processing delay |
| • | Automatic Calibration |
| • | Space-saving 36 Bump micro SMD package |
| • | Up to 20dB SNRI |
Description The LMV1088 amplifies near-field voice signals within 4cm of the microphones while rejecting far-field acoustic noise greater
than 0.5m from the microphones. Up to 20dB of far-field rejection is possible in a properly configured and calibrated system.
Part of the Powerwise® family of energy efficient solutions, the LMV1088 consumes 1mA of supply current while providing superior
performance to DSP solutions consuming over 10 times the power.
A fast calibration during the manufacturing test process allows the LMV1088 to compensate the entire microphone system. This
calibration includes mismatch in microphone gain and frequency response, as well as acoustical path variances. The LMV1088
stores the calibration coefficients in on-board EEPROM. The calibration is initiated by I2C command or by pin control.
The dual microphone inputs are differential to provide excellent noise immunity. The microphones are biased with an internal
low-noise bias supply.
Key Specification
(3.3V supply, unless otherwise specified)
|
Supply voltage
|
2.7V to 5.5V
|
|
Supply current
|
1mA (typ)
|
|
Signal to noise ratio (A-weighted)
|
60dB (typ)
|
|
Total harmonic distortion
|
0.1% (typ)
|
|
Noise cancellation
|
20dB (typ)
|
|
PSRR
|
85dB (typ)
|
Applications
| • | Mobile handsets |
| • | Mobile and handheld two-way radios |
| • | Bluetooth and other powered headsets |
| • | Hand-held voice microphones |
| • | Portable public address systems |
| 
LMV1088
LMV1089
