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

Also Recommended LMV1089▲ Differential Output + Shutdown Pin LMV1090▲ Improved Performance simplified application

Typical Application click for larger image simplified application	Connection Diagram click for larger image Pinout
Typical Performance click for larger image Idd vs Vdd.vsd

Datasheets

Title		Size	Date	Other Language
	LMV1088 Dual Input, Far Field Noise Suppression Microphone Amplifier with Automatic Calibration Ability	1463 Kbytes	26-Feb-09	日本語

Other Technical Documents

Title		Type	Date
	Use microphone arrays for background acoustic noise suppression in portables (Part 1 of 2)	External Article	2008-07-03
	Use microphone arrays for background acoustic noise suppression in portables (Part 2 of 2)	External Article	2008-07-11

Part Number(s) (NSID)	Top View	Availability	Current Reported Stock	Budgetary Pricing	Pack Size
LMV1088RL/NOPB RoHS Status	MICRO SMDXT	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 583 MOUSER Worldwide 250 NEWARK Americas 13	$1.50 each at 1K+ pcs	reel of 250
LMV1088RLX/NOPB RoHS Status	MICRO SMDXT	Full production Lead Time: 6 weeks	Distributor Region Qty DIGI-KEY Worldwide 0	$1.50 each at 1K+ pcs	reel of 1000

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMV1088.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMV1088 is located at RoHS Status.

Part Number(s) (NSID)	Weight (milligrams)	Type	Pins	MSL Rating	Peak Reflow	RoHS Status	CAD Symbols	Models	Package Marking Format
LMV1088RL/NOPB	13.256	MICRO SMDXT	36	1	260	Detail	Download	N/A	XYTT I ZA1
LMV1088RLX/NOPB	13.256	MICRO SMDXT	36	1	260	Detail	Download	N/A	XYTT I ZA1

All information pertaining to the RoHS Compliance Standard can be found at http://www.national.com/en/packaging/leadfree.html.

Moisture Sensitivity Level Data for LMV1088.

A RoHS compliance or an IPC 1752 report can be acquired at http://www.national.com/en/packaging/greennopb.html.

National's certificate of product compliance for LMV1088 is located at RoHS Status.

Design Tools

Title	Size	Date
LMV1088 Software (Windows XP/2000) allows control of the LMV1088 device and its operating modes
LMV1088 Online Noise Reduction Demo
"LMV1088 Evaluation Manual, Gerber and Software"

CAD Symbols and Models Download LMV1088 CAD Symbols

Models N/A