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): 15/84頁(yè)
文件大?。?/td> 599K
代理商: ST75C540FP-A
V.3.12- TelephonyFunctions
ST75C530/540 telephony software provides both
handset and handsfree modes. ST75C530/540is
connected to the phone line through a D.A.A.,
handset and loudspeaker are connected to
ST75C530/540throughamplifiers.
Though the D.A.A. hasto comply with modem/fax
regulationsin most of the applications,the micro-
phone and the earphone amplifier gains will be
adjusted in compliance with the telephonyregula-
Figure 3 :
Handset/HandsfreeMode Operation
tions.Thesoftwareimplementedin ST75C530/540
allows functionssuch as softclipping,AGCin both
modes,andfullduplexmodein handsfree(seeFig-
ure 3).
V.3.12.1- Handset Mode
In handsetmode, all the attenuations(_SPKGAIN,
_TXGAIN, _MIKGAIN) are from 0dB to -inf
(32768 steps). AGC and softclippingfunctionscan
beenabledanddisabledbysoftware(seeFigure4).
DUAL
RAM
INTERFACE
15
ADC
MUTE
DAC
Line
HYBRID
TxA1
TxA2
RxA
ADC
14
11
10 MIC3
8
MIC1
9
MIC2
79SPK2
78
MUTE
77
SPK3
76
MUTE
2
SPK1
1
MUTE
[0..-30]dB
Step 3dB
DAC
ATT_TX
CODER
HANDSFREE/
HANDSET
ALGORITHMS
ATT_MIC
2 TONE
GENERATOR
AGC
2 TONE
DETECTORS
AGC
DG
7
V - FUNCTIONALDESCRIPTION
(continued)
MIC2
SPK2_1
SPK2_2
_MIKGAIN
_SPKGAIN
Softclipping
AGC = F(I
LINE
)
RxA
DP_RING
TxA1
TxA2
_TXGAIN
AGC = F(I
LINE
)
7
Figure 4 :
HandsetMode
ST75C530- ST75C540
15/84
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