LMV1089RLEVAL National Semiconductor, LMV1089RLEVAL Datasheet - Page 9

• 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

Unprocessed_Output Pins
The individual stereo output signal of the two microphone
channels MIC1 and MIC2 are available at the corresponding
Connecting Microphones to the LMV1089 Demoboard
The demoboard can be used to connect a set of two micro-
phones to the LMV1089 to evaluate the performance of the
LMV1089 in a customer application. To enable these micro-
phone input connectors, the jumpers on header J11 and J16
(see Figure 10) must be placed between pin 3–5 and pin 4–
6 of both headers. Microphones can also be connected to
3.5mm connectors J9 and J15 (see Figure 10). The
LMV1089RL demoboard has a provision to place a small PCB
on J12 (see Figure 10) on which two microphones can be
mounted.
FIGURE 9. Unprocessed Audio Outputs
9
outputs of the LMV1089 M1_UNP and M2_UNP. These sig-
nals are available at the headers J1 and J2. (see Figure 9).
Microphones that are connected to the PCB receive a low
noise 2V
mounted on the LMV1089 demoboard.
For situations where microphones are used which do not al-
low for a DC voltage, these microphones should be connected
in a similar way as connecting the audio tester to the inputs.
The jumpers from J11 and J16 (see Figure 8) must be re-
moved and one microphone is connected between pin 2 and
pin 4 of J11 and the other microphone is connected between
pin 2 and pin 4 of J16.
DC
power supply via resistors R1, R2, R4 and R5
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