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FX604P3 参数 Datasheet PDF下载

FX604P3图片预览
型号: FX604P3
PDF下载: 下载PDF文件 查看货源
内容描述: [Modem, 1.2kbps Data, CMOS, PDIP16, DIP-16]
分类和应用: 电信光电二极管电信集成电路
文件页数/大小: 17 页 / 344 K
品牌: CMLMICRO [ CML MICROCIRCUITS ]
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V.23 Compatible Modem  
FX604  
1.6  
Application Notes  
1.6.1 Line Interface  
The signals on the telephone line are not suitable for direct connection to the FX604. A Line Interface circuit is  
necessary to:  
·
·
·
·
Provide high voltage and dc isolation  
Attenuate the Tx signal present at the Rx input  
Provide the low impedance drive necessary for the line  
Filter the Tx and Rx signals  
R2  
R3  
R4-R7  
See below  
See below  
100kW  
C5  
C6  
C7  
22mF (±20%)  
100pF  
330pF  
Resistors ±1%, capacitors ±10% unless otherwise stated.  
Figure 7 Line Interface Circuit  
Notes:  
·
·
·
The components 'Z' between points B and C should match the line impedance.  
Device A2 must be able to drive 'Z' and the line.  
R2: For optimum results R2 should be set so that the gain is VDD/5.0, i.e. R2 = 100kW at VDD  
5.0V, rising to 150kW at VDD = 3.3V.  
=
·
R3: The levels in dB (relative to a 775mV rms signal) at 'A', 'B' and 'C' in the line interface circuit are:  
'A' = 20Log(VDD/5)  
'B' = 'A' + 20Log(100kW/R3)  
'C' = 'B' - 6  
VDD  
3.3V  
5.0V  
'A'  
-3.6dB  
0dB  
R3  
100kW  
150kW  
'B'  
-3.6dB  
-3.5dB  
'C'  
-9.6dB  
-9.5dB  
ã 1996 Consumer Microcircuits Limited  
12  
D/604/3