Sierra Wireless MC5725 Hardware Integration Manual page 53

MIC_P
MIC_N
Audio In
RF Filter
33n
22p
35mW @ +3dBm0
SPK_N
SPK_P
Audio Out
Note: Make sure the host device
includes DC blocking capacitors
on the Audio In lines – the
module does not include series
capacitors.
Rev 1.9.1 Feb.09
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
57.3mVrms
@ 0dBm0
MIC_AMP2_BYP
MIC_AMP1_GAIN
+16dB
+8dB
10 01
+6dB
MIC_SEL
-2dB
AMP_SEL
001 010 100
13 bit D/A
Proprietary and Confidential
Figure 4-1: MC5725V / MC5727V Audio system block
TX ADC
TX_HPF_DIS_N
TX_SLOPE_FILT_DIS_N
CodecTxGain
HPF &
13 bit A/D
Slope
+12dB
0dB
-84dB
CodecSTGain
+12dB
-48dB
-96dB
CodecRxGain
RX_HPF_DIS_N
HPF
+12dB
0dB
-81dB
RX DAC
MC5728V system block
Figure 4‐2 represents the MC5728V 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 to 0 dB or +24 dB only
CodecSTGain, when set to the minimum setting, effec‐
·
tively mutes sidetone in the module codec
+12dB
Encoder
-3dB
-84dB
nsSwitch TxPCMFilt TxVolume
NS &
Tx FIR
AAGC
DTMF Tx Gain
DTMF DTMF
Decoder Encoder
DTMF Rx Gain
Rx FIR AAGC
RxVolume
+12dB
RxPCMFilt
-25dB
-84dB
Audio Interface
13K CELP/
EVRC
Encoder
Decoder RF
Interface
13K CELP/
EVRC
Decoder
53