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參數(shù)資料
| 型號(hào)： | ST75C540FP-A |
| 廠商： | 意法半導(dǎo)體 |
| 英文描述： | SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES |
| 中文描述： | 超級(jí)綜合DEVICESWITH數(shù)字信號(hào)處理器，模擬前端 |
| 文件頁(yè)數(shù)： | 17/84頁(yè) |
| 文件大?。?/td> | 599K |
| 代理商： | ST75C540FP-A |
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V - FUNCTIONALDESCRIPTION
(continued)
V.3.12.2- Handsfree Mode
The handsfree uses a MIC1 and a SPK1 as microphone and loudspeaker interface (see Figure 6).
SPK1P
SPK1N
_SPKGAIN
RxA
TxA1
TxA2
ADAPTIVE
FIR
FILTER
MIC1
_MIKGAIN
ACOUSTIC
FILTER
ADAPTIVE
ATTENUATOR
NLMS
CONTROL
NLMS
ADAPTIVE
FIR
FILTER
AGC = F(I
L
)
_TXGAIN
Softclipping
AGC = F(I
L
)
ADAPTIVE
ATTENUATOR
-
+
+
-
7
Figure 6 :
HandsfreeMode : Full Duplex
Tx Characteristics
Symbol
Gtx
Parameter
TestConditions
Min.
Typ.
24
Max.
Unit
dB
Transmit Gain
_MIKGAIN=7FFF,_TXGAIN=7FFF ,AGCdisabled,
V
MIC1
= -21dBV
2k
between MIC1 and GND
V
MIC1
= - dBV
_MIKGAIN=7FFF,_TXGAIN=7FFF ,AGCdisabled,
V
MIC1
= -9dBV
Ntx
Mmic
Dtx
Transmit noise
Microphone mute
Transmit distortion
-70
60
dBmp
dB
%
2
Rx Characteristics
Symbol
Grx
Mrx
Dtx
Parameter
TestConditions
Min.
Typ.
24
60
Max.
Unit
dB
dB
%
Receive Gain
Mute
Receive distortion
(SPK1 output)
_SPKGAIN=7FFF, AGC disabled, V
RXA
= -33dBV
_SPKGAIN=7FFF, AGC disabled, V
RXA
= -33dBV
2
AGC
TheAGChasthe samebehaviorasin Handsetmode.Furthermore,the maximum gainaddedby AGCcan
be fixed by using the RX_GAINMAXand TX_GAINMAXregisters.
Softclipping
SeeFigure 7.
SystemStability
Parameter
TestConditions
Min.
20
20
Typ.
Max.
Unit
dB
dB
Loop attenuation in Rx RxA to TxA1-TxA2
Loop attenuation in Tx MICx to SPK1P-SPK1N
Speaker gain is 12dB, Mike gain is14dB
Analogique sidetone not used
(see DAA schematics)
It is possible to add some gain switching in the Tx and Rx path (to reduce the gain of the loop) by using
the GAIN_RCV and GAIN_XMTregisters.
ST75C530- ST75C540
17/84
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