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參數資料
型號: W6694
廠商: WINBOND ELECTRONICS CORP
英文描述: PCI Bus ISDN S/T Interface Controller(PCI總線的ISDN S/T接口控制器)
中文描述: PCI總線的綜合業務數字網的S / T接口控制器(綜合業務數字網的PCI總線的S / T的接口控制器)
文件頁數: 21/98頁
文件大小: 1338K
代理商: W6694
Data Sheet
W6692A PCI ISDN S/T-Controller
Publication Release Date:
Mar,2000
Revision 1.0
-21 -
The transmitter and receiver are implemented by differential circuits to increase signal to noise ratio (SNR). The nominal
differential line pulse amplitude at 100
termination is 750 mV, zero to peak. Transformers with 2:1 turn ration are needed at
transmitter and receiver for voltage level translation and DC isolation.
To meet the electrical characteristic requirements in I.430, some additional circuits are needed. At the transmitter side, the
external resistors (18 to 33
) are used to adjust the output pulse amplitude and to meet the transmitter active impedance (
20
) when transmitting binary zeros. At the receiver side, the 1.8 k
resistors protect the device inputs, while the 10 k
resistors
(1.8 k
+8.2 k
) limit the peak current in impedance tests. The diode bridge is used for overvoltage protection.
FIG.7.3 EXTERNAL TRANSMITTER CIRCUITRY
FIG.7.4 EXTERNAL RECEIVER CIRCUITRY
SX1
SX2
18-33
18-33
GND
ο
VDD
2:1
100
SR1
SR2
1.8k
1.8k
GND
ο
VDD
8.2k
8.2k
2:1
100
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