Wavecom GS64 Especificações descarregar pdf (Página 57)

Product Technical Specification & Customer Design Guidelines

Interfaces

Page: 56 / 116

This document is the sole and exclusive property of WAVECOM. Not to be distributed or divulged without

prior written agreement.

WA_DEV_Q64_PTS_001-003 January 9, 2009

3.11.4 Application

3.11.4.1 Microphone

3.11.4.1.1 MIC1 Differential Connection Example

Figure 13: Example of MIC1 input differential connection with LC filter

*:Z1 is from 200Hz to 4kHz. For more characteristics refer to chapter 3.11.1.1.1.

Note: Audio quality can be very good without L1, L2, C2, C3, and C4 depending on

the design. But if there is EMI perturbation, this filter can reduce the TDMA

noise. This filter (L1, L2, C2, C3, C4) is not mandatory. If not used, the

capacitor must be removed and coil replaced by 0 Ω resistors as shown in the

following schematic.

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Wavecom GS64 Especificações Página 57