參數(shù)資料
型號(hào)： MC33121P
廠商： MOTOROLA INC
元件分類： 模擬傳輸電路
英文描述： LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT
中文描述： TELECOM-SLIC, PDIP20
封裝： PLASTIC, DIP-20
文件頁(yè)數(shù)： 17/32頁(yè)
文件大?。?/td> 570K
代理商： MC33121P
MC33121
MOTOROLA
17
The resistors must be able to withstand transient voltages
expected at Tip and Ring. The TSI and RSI pins have internal
clamp diodes rated for a maximum of 1.0 A under surge
conditions only (Figure 33). Resistor manufacturers must be
consulted for the proper type of resistor for this environment.
5) AC Terminating Impedance and Source Impedance
(Zac) — Return Loss
The return loss measurement is a measure of how closely
the AC impedance of the SLIC circuit matches the charac-
teristic impedance of the phone line, or a reference imped-
ance. The reference impedance can be, in some cases, a
pure resistance (commonly 600
or 900
), a series resistor
and capacitor (900
+ 2.16
μ
F), or a more complex network.
To achieve proper return loss with the MC33121, the RRO
impedance shown in Figure 34 is to have the same config-
uration as the reference impedance, but with values scaled
according to the equations mentioned below.
CRO, used primarily for DC blocking, is generally a large
value (1.0
μ
F) so as to not affect the impedance of RRO.
However, it can be included in the RRO network if a complex
network is required.
Figure 33. Longitudinal Impedance
ZLONG
ILONG
TIP
RING
VLONG
AC
VCC
RS
EP
BP
TSI
RSI
BN
EN
VEE
VCC
7.0 V
VEE
14 V
BUFFER
100
VQB
COMMON MODE
DETECTOR
& AMPLIFIER
–24 V
ZLONG
ILONG
RS
BUFFER
100
MC33121
Figure 34. AC Terminating Impedance
–
+
–
+
–
+
–
+
TIP
RING
VCC
EP
BP
RSI
CN
BN
EN
VQB
IL
MC33121
ZT
2
TSI
CP
AC
ZT
2
ZAC
RP
100
RC 1.0 k
RS 9.1 k
IT
30
3060
31 k
AC
IA
AV =
0.328
TO VEE
VAG
RXI
TXO
IRXI
RRO
CRO
IA = IRXI
RP
100
RC 1.0 k
RS 9.1 k
IT
3060
30
31 k
IA
AC
MIRROR
VL
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