Demonstration board and accessories

AN4146

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DocID023502 Rev 2

1.2

STEVAL-MKI126Vx board

The main task of the STEVAL-MKI126Vx in Figure 4 is to convert the PDM signals provided

on a general connector and APWLink connector. The PWM signals, properly filtered,

provide an analog interface. There are two different versions of the board depending on the

microphones soldered onboard:

•

STEVAL-MKI126V1: MP45DT02 devices have been soldered

•

STEVAL-MKI126V3: MP34DT01 devices have been soldered

Figure 4. STEVAL-MKI126Vx

1.3

Microphone adapters

Microphone adapters are small circular PCBs with a single soldered MEMS microphone.

There are three different ordering codes for each board corresponding to the different type

of mounted digital microphone (STEVAL-MKI129V1 for the MP34DT02, STEVAL-MKI129V2

for the MP34DB01, and STEVAL-MKI129V3 for the MP34DT01. Please refer to AN4184

“Microphone coupon boards STEVAL-MKI129Vx based on the MP45DT02, MP34DB01,

and MP34DT01” for further details.

Figure 5. MP34DT01 microphone adapter board