LMV1089RLEVAL National Semiconductor, LMV1089RLEVAL Datasheet - Page 2

• Manufacturer Part Number: LMV1089RLEVAL
• Description: BOARD EVALUATION LMV1089
• Manufacturer: National Semiconductor
• Series: PowerWise®r

Specifications of LMV1089RLEVAL

• Main Purpose: Audio, Microphone Amp
• Embedded: No
• Utilized Ic / Part: LMV1089
• Primary Attributes: Dual Input, Single Output
• Secondary Attributes: Graphical User Interface, I²C Interface
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

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General Description
The LMV1089 is a fully analog dual input, differential output,
microphone array amplifier designed to reduce background
acoustic noise, while delivering superb speech clarity in voice
communications applications. The LMV1089 incorporates
calibration circuitry which may be initiated by either an I
command or by a logic level control on a separate input pin.
The calibration sequence compensates for gain and frequen-
cy response variations of the microphones used with the
LMV1089, eliminating the need to use expensive matched
microphone sets. The calibration data is stored in the internal
EEPROM memory. The LMV1089 has two differential input
microphone amplifier channels plus far field noise suppres-
sion (FFNS) processing circuitry. The amplifiers and FFNS
FIGURE 2. The LMV1089RL Demo Board
2
C
2
circuitry are adjustable for gain differences in the MIC chan-
nels of 6dB. The frequency response variations of the micro-
phones over the voice band frequency range can also be
adjusted for differences of ±3dB. The compensation or cali-
bration function is achieved via memory stored coefficients.
These are determined when the FFNS calibration function is
activated. The purpose of the calibration sequence is to
choose the optimized coefficients for the FFNS circuitry for
the given microphones, spacing, and acoustical environment.
Operating Conditions
•
•
•
Temperature Range
Power Supply Voltage
I
2
C supply voltage
1.7V
2.7V
-40°C
≤
≤
I
2
30060601
≤
CV
VDD
TA
DD
≤
≤
≤
85°C
5.5V
5.5V