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
文件頁數(shù)： 19/84頁
文件大小： 599K
代理商： ST75C540FP-A
V.4.3- Crystal
The crystal frequency must be 44.2368MHz for
ST75C530and 49.152MHzfor ST75C540with an
accuracybetterthat
±
100 ppm. Whenusinga third
harmoniccrystal the schematicmust beas follow:
see Figure10.
The crystal featuresare :
- third harmonic,
- parallel, load capacitance= 10pF,
- 100ppm from 0
o
C to 70
o
C,
- R
S
< 50
,
- ATcut(example : SM55-10MATEL).
XTAL H3 **
C2
27pF
COG
L*
0.82
μ
H (ST75C530)
0.68
μ
H(ST75C540)
Cb
10nF
C1
10pF
COG
ST75C540
73
72
EXTALL
XTALL
Wire wound inductor recommanded (Example : SIGMA-SC30)
Thrird harmonic (Example : MATEL-SM55-10)
*
**
XTAL H3 : 44.2368MHz (ST75C530)
49.152MHz(ST75C540)
7
Figure 10
V.4.4- TypicalApplicationSchematic
TheFigure11is a blockdiagramdesignedtoallow
transmission of fax signals up to +0dBm and sine
waveup to +6dBmon the telephoneline. It allows
receptionof faxsignalsup to0dBmandsinewaves
upto +6dBm.Figure12isablockdiagramdesigned
V - FUNCTIONALDESCRIPTION
(continued)
-1/2
600
1:1
Line
2.2nF
+8dB
-10dB
V
CM
TxA1
TxA2
RxA
7
Figure 11
-1/2
600
1:1
Line
2.2nF
0dB
0dB
V
CM
TxA1
TxA2
RxA
7
Figure 12
to allow transmission of Modem signal up to -
10dBmand receptionup to -10dBm.The OPAmps
are +12/0V powered. With this application sche-
matictheoutofbandtransmitspectrum(from4kHz
to 50kHz)is below -72dBm.
Figures13and14areexamplesofapplicationsche-
maticswhichrespectsgainvalue(respectivelyforfax
and voice application and for Modem application)
andtheminimumdifferentialloadonTxA1andTxA2.
V.4.5 - Host Interface
The host interfaceis seen bythe microas a 128x8
RAM, with additional registers accessible through
an 8-bitaddressspace.AselectionPin(INT/MOT)
allowsto configurethe hostbus foreither INTELor
MOTOROLAtype control signals.
ST75C530- ST75C540
19/84
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