Sierra Wireless MC5725 Hardware Integration Manual page 54

CDMA and GSM / UMTS Mini Card Hardware Integration Guide
MIC1P
MIC1N
Audio In
RF Filter
33n
22
p
35mW @ +3dBm0
SPK1P
SPK1N
Audio Out
Note: Make sure the host device
includes DC blocking capacitors
on the analog Audio In lines –
the module does not include
series capacitors.
54
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
Figure 4-2: MC5728V Audio system block
57.3mVrms
@ 0dBm0
MIC_A MP1
0 dB or +24 dB
MIC_SEL
AMP_SEL
13 bit D/A
MC8775V / MC8785V / MC8790V / MC8791V / MC8792V
system block
Figure 4‐3 represents the MC8775V / M C8785V / M C8790V /
M C8791V / M C8792V module's audio system block, and
includes the following features:
•
•
•
•
Proprietary and Confidential
g
TX ADC Encoder
TX_HPF_DIS_N
TX_SLOPE_FILT_DIS_
N
CodecTxGain
HPF &
13 bit A/D
Slope
+12dB
0dB
-84dB
CodecSTGain
0dB
-48dB
-96dB
CodecRxGain
RX_HPF_DIS_N
HPF
+12dB
0dB
-84dB
RX DAC
Module interconnects are shown on the left side of the
diagram. The analog audio interface uses the signals:
MIC_P / MIC_N
·
SPK_P / SPK_N
·
The digital PCM audio interface uses the signals:
PCM_CLK
·
PCM_DIN
·
· PCM_DOUT
· PCM_SYNC
Dynamic ranges for each programmable gain stage are
listed, with the following constraints:
MIC_AMP1 is programmable in 1.5 dB steps
·
· CodecSTGain, when set to the minimum setting, effec‐
tively mutes sidetone in the module codec
When PCM audio is selected, the RX DAC and TX ADC
blocks are bypassed—the external PCM codec controls
transmit gain, receive gain, and sidetone gain.
+12dB
-3dB
-84dB
TxPCMFilt TxVolume
nsSw itch
NS &
Tx FIR
13K CELP/
AAGC
EVRC
Encoder
DTMF Tx Gain
DTMF DTMF
Decoder Encoder
Decoder
DTMF Rx Gain
13K CELP/
Rx FIR AAGC EVRC
Decoder
RxVolume
+12dB
RxPCMFilt
-25dB
-84dB
RF
Interface
2130114