User's Manual

Audio Interface
Rev 1.12.4 Oct.09 Proprietary and Confidential 27
In the event of a discrepancy in values between this guide and the Product Specification Document (PSD), the PSD takes precedence.
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indiscretestepsonly
· MIC_AMP2(MC5727Vonly)isprogrammablein
discretestepsonly
· CodecSTGain,whensettotheminimumsetting,effec‐
tivelymutessidetoneinthemodulecodec
Figure 4-1: MC5725V / MC5727V Audio system block
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
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,effec‐
tively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