Wavecom GS64 Especificaciones descargar pdf (Pagina 60)

Product Technical Specification & Customer Design Guidelines

Interfaces

The capacitor C1 is highly recommended to eliminate the TDMA noise. C1 must be

close to the microphone.

Recommended components:

 C1: 12pF to 33pF (needs to be tuned depending on the design )

 C2: Need to be tuned depending on the design.

 L1: Need to be tuned depending on the design.

3.11.4.1.3 AUXI connection example

VREF

Audio

ADC

Z2*= 120k O hm

typ

100nF

WMP100

(Inside Q64)

AUXI

AREF

Page: 59 / 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

C1MIC

Figure 17: Example of AUXI input single-ended connection with LC filter

*:Z2 is from 200Hz to 4kHz. For more characteristics refer to chapter 3.11.1.1.2.

While using a single-ended connection in AUXI, ensure to have a good ground plane,

a good filtering and shielding, in order to avoid any disturbance on the audio path. It

is recommended to use the Q64 Wireless CPU

AREF pin for good plane connection.

It is recommended to add L1 and C2 footprint to add a LC EMI filter to try to eliminate

the TDMA noise.

When not used, the filter can be removed by replacing L1 by a 0 Ω resistor and by

disconnecting C2, as shown in the following schematic.

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Wavecom GS64 Especificaciones Pagina 60