LMV1089RLEVAL National Semiconductor, LMV1089RLEVAL Datasheet - Page 3

• 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

LMV1089 Demo Board Features
With the LMV1089 demo board, evaluation of the noise sup-
pression function of the LMV1089 is very convenient. This
board makes it easier to measure most of the characteristics
of the LMV1089 that can be found in the LMV1089 data sheet.
To facilitate this there are various connections to apply test
signals and measure output signals and supply currents.
These connections are described later in this document. The
LMV1089 demo board can also be hooked up in a test appli-
cation to evaluate the operation of the FFNS system. There
are connectors for microphone inputs and processed outputs.
The LMV1089 demo board is equipped with a generic 6 pin
header for I
2
C interfacing to the part.
FIGURE 3. The LMV1089RL Demo Board Block Diagram
3
The physical effect of the operation of the noise suppressions
function will result in a first order high-pass behavior with a
corner frequency at about 2 kHz. (The corner frequency is
application and construction dependent). In most application
containing the LMV1089 there will be a low pass filter required
that will correct for this high-pass effect. This low-pass filter
can be configured at the differential output stages of the
LMV1089. The LMV1089 demo board provides the means to
easily change the cutoff frequency of that filter by connecting
the frequency determining capacitors to headers on the PCB.
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