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| 型号： | W671330P |
| 厂商： | WINBOND ELECTRONICS CORP |
| 元件分类： | 模拟传输电路 |
| 英文描述： | TELECOM-SLIC, PQCC28 |
| 封装： | PLASTIC, LCC-28 |
| 文件页数： | 16/48页 |
| 文件大小： | 1344K |
| 代理商： | W671330P |
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W671300 SERIES
TIP AMP
RING AMP
TIP
RING
MTU REF
GND
600
FIGURE 8: LPS 2-WIRE INTERFACE CIRCUIT DIAGRAM
7.2.1.2. Maintenance Terminal Unit (MTU) Compliance
MTU compliance places DC voltage requirements on the 2-wire terminals during idle line conditions.
The voltage is expressed as the difference between Tip and Ring. The minimum idle voltage is
42.75V. The high side of the MTU range is 56V.
The Tip voltage is held near ground through a 600 resistor and switch. The Ring voltage is limited to
a maximum of -56V (by MTU REF) when operating from either the high or low battery. A switch and
600 resistor connect the MTU reference to the Ring terminal. When the high battery voltage exceeds
the MTU reference of -56V, the Ring terminal will be clamped by the internal reference (typically -
54V). The same Ring relationships apply when operating from the low battery voltage. For high battery
voltages (VBH) less than or equal to the internal MTU reference threshold:
VRING
VBH 5
+
=
(EQ. 43)
7.2.1.3. Loop Current
During Low Power Standby, the device will provide current to a load. The current path is through
resistors and switches, and will be a function of the off hook loop resistance (RLOOP) which includes
the off hook phone resistance and copper loop resistance. The current available during Low Power
Standby is determined by the following equation.
ILOOP
1
54
(
)
(
) 600 600 RLOOP
+
(
)
=
(EQ. 44)
Internal current limiting of the standby switches will limit the maximum current to approximately 20 mA.
Another loop current related parameter is longitudinal current capability. The longitudinal current
capability is reduced. The reduction in longitudinal current capability is a result of disabling the Tip and
Ring amplifiers.
Publication Release Date: March 2004
- 23 -
Revision 0.5
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