Wavecom GS64 Especificaciones descargar pdf (Pagina 59)

Product Technical Specification & Customer Design Guidelines

Interfaces

3.11.4.1.2 MIC1 Single-ended Connection Example

Audio

ADC

Z1*= 1100

typ

2.1 V typ

100nF

MIC1P

MIC1N

Page: 58 / 116

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prior written agreement.

WA_DEV_Q64_PTS_001-003 January 9, 2009

WMP100

(Inside Q64)

60 AREF

Figure 15: Example of MIC1 input single-ended connection with LC filter

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

Internal input impedance value becomes 1100 Ω, due to the connection of MIC1N to

ground.

It is recommended to use the Q64 Wireless CPU

AREF pin for good ground

connection.

It is recommended to add L1 and C2 footprint to add a LC filter to reduce the TDMA

noise.

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

disconnecting C2, as the following schematic.

Audio

ADC

Z1*= 1100

typ

2.1V typ

100nF

MIC1P

MIC1N

WMP100

(Inside Q64)

60 AREF

Figure 16: Example of MIC1 input single-ended connection without LC filter

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

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Wavecom GS64 Especificaciones Pagina 59