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ST75C540 数据表(PDF) 16 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) 16 Page - STMicroelectronics

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Tx Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Gtx
Transmit Gain
_MIKGAIN=7FFF,_TXGAIN=7FFF, AGC disabled
VMIC2 = -21dBV
VMIC2 = -9dBV
18
8
dB
dB
Ntx
Transmit noise
2k
Ω between MIC2 and GND
-73
dBmp
Mmic
Microphone mute
VMIC2 = -21dBV
60
dB
VLpeak
Transmit softclipping
level on TxA1-TxA2
_MIKGAIN=7FFF,_TXGAIN=7FFF, AGC disabled
see Figure 3, VMIC2 = -9dBV
2.5
Vpp
Dtx
Transmit distortion
_MIKGAIN=7FFF,_TXGAIN=7FFF, AGC disabled
see Figure 3, VMIC2 = -9dBV
2%
Rx Characteristics
Symbol
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
Grx
Receive Gain
_SPKGAIN=7FFF , AGC disabled, VRXA = -16 dBV
6
dB
Nrx
Receive noise
-79
dBmp
Mrx
Mute
VRXA = dBV
60
dB
Dtx
Receive distortion
(SPK2 output)
_SPKGAIN=7FFF , AGC Disabled, VRXA = -16dBV
2
%
AGC
The line current information is coming from the
D.A.A. on DP_RING pin (frequencycoded informa-
tion using by example a TS555 general purpose
timer). The AGC has a 6dB depth . The attenuation
table can be loaded to comply with each country
regulation. The default table has the following val-
ues. The value of the AGC gain is applied to both
Tx and Rx path (see Table 1).
The address of the table is given in the register
@_TABLE.
The table length is 53. The AGC is enabled using
CONF or MODC command (see paragraph ”VII -
COMMAND SET DESCRIPTION”.
Once the AGC is running, it is possible to freeze the
AGC gain with the register AGC_FRZ.
Softclipping
The softclipping introduces a 12dB gain and has a
18dB depth.
The softclipping value is half digital range
(4000 Hex) (see Figure 5).
V - FUNCTIONAL DESCRIPTION (continued)
104
103
102
10
V
MICX (mVRMS)
103
0
2
4
6
8
10
12
(mV
RMS)
D (%)
VTxA1-TxA2 (V
RMS)
Distortion
Tx Softclipping and Distortion
102
Figure 5 : Softclipping Static Gain
Table 1 : AGC Gain versus Period Information
Period (ms)
<9
10
10.8
11.6
14.5
13.3
14.1
15.5
16.6
17.5
18.3
19.1
20
>20
Table Index
<13
13
14
15
16
17
18
19
20
21
22
23
24
>24
Gain (dB)
0
0.7
1.5
2.2
3
3.4
4
4.5
4.8
5.1
5.4
5.6
5.8
6
ST75C530 - ST75C540
16/84



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