User's Manual

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
26 Proprietary and Confidential 2130114
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Thesemodulesareintendedtoserveasanintegralcomponent
ofamorecomplexaudiosystem—forexample,aPDAwitha
separatecodecinterfacedtotheHostApplicationprocessor.
Usually,theinterfacebetweenthemoduleandthehostaudio
systemissettoline‐levelamplitud eswithnotransducer
considerations.The
responsibilityofthemodulecodecorhost
codecforspecialfunctionsisdetailedinTable4‐2.
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
FIR (Finite Impulse
Response) filtering
MC87xx:
• Option of providing 13 tap FIR filtering for receive and transmit
paths to equalize the acoustic response of the speaker and micro-
phone elements.
Audio pass band
300 Hz–3.4 kHz
Table 4-1: Audio features (Continued)
Feature Transmit Receive
Table 4-2: Functions - responsibility codecs
Function Responsible Codec
Phone oriented (e.g., echo
cancellation, FIR filtering)
Module codec
Path-switching
Host codec
Transducer interfaces
Host codec
Adjustable gain / volume settings
Either
DTMF / ringer tone generation
Either
Mixing
Host codec