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ST75C540 数据表(PDF) 17 Page - STMicroelectronics

部件名 ST75C540
功能描述  SUPER INTEGRATED DEVICESWITH DSP, AFE & MEMORIES FORTELEPHONY,MODEM, FAXOVERINTERNET& POTSLINES
PDF  84 Pages
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制造商  STMICROELECTRONICS [STMicroelectronics]
网页  http://www.st.com
标志 STMICROELECTRONICS - STMicroelectronics

ST75C540 数据表(HTML) 17 Page - STMicroelectronics

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V - FUNCTIONAL DESCRIPTION (continued)
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
-
+
+
-
Figure 6 : Handsfree Mode : Full Duplex
V.3.12.2 - Handsfree Mode
The ha ndsfree uses a MIC1 and a SPK1 as microphone and loudspeaker interface (see Figure 6).
Tx Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Gtx
Transmit Gain
_MIKGAIN=7FFF,_TXGAIN=7FFF ,AGC disabled,
VMIC1 = -21dBV
24
dB
Ntx
Transmit noise
2k
Ω between MIC1 and GND
-70
dBmp
Mmic
Microphone mute
VMIC1 = - dBV
60
dB
Dtx
Transmit distortion
_MIKGAIN=7FFF,_TXGAIN=7FFF ,AGC disabled,
VMIC1 = -9dBV
2%
Rx Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Grx
Receive Gain
_SPKGAIN=7FFF, AGC disabled, VRXA = -33dBV
24
dB
Mrx
Mute
60
dB
Dtx
Receive distortion
(SPK1 output)
_SPKGAIN=7FFF, AGC disabled, VRXA = -33dBV
2
%
AGC
The AGC has the same behavior as in Handset mode. Furthermore, the maximum gain added by AGC can
be fixed by using the RX_GAINMAX and TX_GAINMAX registers.
Softclipping
See Figure 7.
System Stability
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Loop attenuation in Rx RxA to TxA1-TxA2
Speaker gain is 12dB, Mike gain is 14dB
20
dB
Loop attenuation in Tx MICx to SPK1P-SPK1N Analogique sidetone not used
(see DAA schematics)
20
dB
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_XMT registers.
ST75C530 - ST75C540
17/84



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