Specifications

Audio Interface
Rev 2.0 Apr.10 Proprietary and Confidential 49
Figure 4-1: MC5727V Audio system block
MC5728V system block
Figure 4-2 on page 50 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
Note: Make sure the host
device includes DC
blocking capacitors on the
Audio In lines – the module
does not include series
capacitors.
• 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, effectively mutes sidetone
in the module codec
Decoder
RX DAC
EncoderTX ADC
HPF &
Slope
HPF
Echo Cancellation
NS &
AAGC
Tx FIR
Rx FIR
13K CELP/
EVRC
Decoder
AAGC
13 bit A/D
13 bit D/A
CodecRxGain
RX_HPF_DIS_N
CodecSTGain
CodecTxGain
TX_HPF_DIS_N
TX_SLOPE_FILT_DIS_N
MIC_AMP1_GAIN
+16dB
+8dB
+6dB
-2dB
nsSwitch TxPCMFilt
TxVolume
RxVolume
RxPCMFilt
AMP_SEL
001 010 100
10 01
MIC_SEL
35mW @ +3dBm0
RF Filter
33n
22p
MIC_AMP2_BYP
PCM I/F
+12dB
-25dB
-84dB
+12dB
-3dB
-84dB
+12dB
0dB
-81dB
+12dB
-48dB
-96dB
+12dB
0dB
-84dB
57.3mVrms
@ 0dBm0
SPK_P
SPK_N
MIC_P
MIC_N
13K CELP/
EVRC
Encoder
DTMF
Encoder
DTMF Rx Gain
DTMF Tx Gain
DTMF
Decoder
Audio In
Audio Out
RF
Interface