System Block Diagrams - Sierra Wireless MC5725 Hardware Integration Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
Note: Make sure the host device
includes DC blocking capacitors
on the Audio In lines – the
module does not include series
capacitors.
52
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Usually, the interface between the module and the host audio
system is set to line‐level amplitudes with no transducer
considerations. The responsibility of the module codec or host
codec for special functions is detailed in Table 4‐2.
Table 4-2: Functions - responsibility codecs
Function
Phone oriented (e.g., echo
cancellation, FIR filtering)
Path-switching
Transducer interfaces
Adjustable gain / volume settings
DTMF / ringer tone generation
Mixing

System block diagrams

Note: When integrating the module into your host platform, make sure
the module has sufficient shielding to prevent RF interference.
MC5725V / MC5727V system block
Figure 4‐1 represents the MC5725V / MC5727V module's audio
system block, and includes the following features:
Module interconnects are shown on the left side of the
•
diagram. The audio interface uses the signals:
· MIC_P / MIC_N
SPK_P / SPK_N
·
Dynamic ranges for each programmable gain stage are
•
listed, with the following constraints:
MIC_AMP1 is programmable in discrete steps only
·
CodecSTGain, when set to the minimum setting, effec‐
·
tively mutes sidetone in the module codec
Proprietary and Confidential
Responsible Codec
Module codec
Host codec
Host codec
Either
Either
Host codec
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