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参数资料
| 型号： | W671552P |
| 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： | 14/42页 |
| 文件大小： | 1230K |
| 代理商： | W671552P |
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W671500 SERIES
TIP
RING
VRS
R/8
R
+
-
+-
5:1
20
+-
+
-
600K
V
BH
2
FIGURE 10: LINEAR RINGING MODEL
The equations for the TIP and RING outputs during ringing are provided below.
VT
VBH
2
-----------
40 VRS
×
(
)
+
=
(EQ. 33)
VR
VBH
2
-----------
40 VRS
×
(
)
=
(EQ. 34)
When the input signal at VRS is zero, the Tip and Ring amplifier outputs are centered at half battery.
The device provides auto centering for easy implementation of sinusoidal ringing waveforms. Both AC
and DC control of the Tip and Ring outputs are available during ringing. This feature allows for DC
offsets as part of the ringing waveform.
7.2.4.2. Ringing Signal Input
The Ringing Signal Input, VRS, is a high impedance input. The high impedance allows the use of low
value capacitors for AC coupling of the ring signal. The VRS input is enabled only during the Ringing
mode, therefore a free running oscillator may be connected to VRS at all times.
When operating from a battery of -100V, each amplifier, Tip and Ring, will swing a maximum of 95VP-
P. Hence, the maximum signal swing at VRS to achieve full scale ringing is approximately 2.4VP-P. The
low signal levels are compatible with the output voltage range of the CODEC.
7.2.4.3. Logic Control
Ringing patterns consist of ringing periods and silent intervals. The ringing to silent pattern is called
the ringing cadence. During the silent portion of ringing, the device can be programmed to any other
operating mode. The most likely candidates are Low Power Standby or Forward Active. Depending on
system requirements, the low or high battery may be selected.
Loop supervision is provided with the Ring Trip Detector. The Ring Trip Detector senses the change in
loop current when the phone is taken off hook. The loop detector full wave rectifies the ringing current,
Publication Release Date: April 2004
- 21 -
Revision 1.0
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