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參數資料
| 型號： | MC33121FN |
| 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, PQCC28 |
| 封裝： | PLASTIC, LCC-28 |
| 文件頁數： | 17/32頁 |
| 文件大小： | 570K |
| 代理商： | MC33121FN |
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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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相關代理商/技術參數 |
參數描述 |
|---|---|
| MC33121P | 制造商:Rochester Electronics LLC 功能描述:SLIC III - Bulk |
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| MC33128D | 制造商:MOTOROLA 制造商全稱:Motorola, Inc 功能描述:POWER MANAGEMENT CONTROLLER |
| MC33129 | 制造商:FREESCALE 制造商全稱:Freescale Semiconductor, Inc 功能描述:High Performance Current Mode Controllers |
| MC33129D | 制造商:Motorola Inc 功能描述: |
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