Specifications

Rev 1 Dec.10 Proprietary and Confidential - Specifications subject to change 55

• If no filter is used, capacitors must be removed and the coil replaced by 0

resistors as shown in Figure 4-5 on page 55.

Figure 4-5: Example—MIC differential connection without an LC filter (TBD)

Capacitor C1 is highly recommended to eliminate TDMA noise and it must be

connected close to the microphone.

Tabl e 4- 2 3 lists the recommended components to use in creating the LC filter.

AirPrime SL module

Audio

ADC

MIC

MIC1_P

MIC1_N

1350 Ohm typ

100nF

1350 Ohm typ

1.2V typ

Table 4-23: Recommended components for a MIC differential

connection

Component Value Notes

C1 12–33 pF Must be tuned depending on

the design.

C2, C3, C4 47 pF Must be tuned depending on

the design.

L1, L2 100 nH Must be tuned depending on

the design.