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參數(shù)資料
| 型號： | SI3211 |
| 廠商： | Electronic Theatre Controls, Inc. |
| 元件分類： | Codec |
| 英文描述： | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| 中文描述： | ProSLIC產(chǎn)品可編程的CMOS用戶接口/有振鈴編解碼器/電池電壓生成 |
| 文件頁數(shù)： | 35/122頁 |
| 文件大?。?/td> | 1950K |
| 代理商： | SI3211 |
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Si3210/Si3211/Si3212
Preliminary Rev. 1.11
35
In addition, the user must select the sinusoidal ringing
waveform by writing TSWS = 0 (direct Register 34,
bit 0).
Trapezoidal Ringing
In addition to the sinusoidal ringing waveform, the
ProSLIC
supports
trapezoidal
illustrates a trapezoidal ringing waveform with offset
V
ROFF
.
ringing. Figure 20
Figure 20. Trapezoidal Ringing Waveform
To configure the ProSLIC for trapezoidal ringing, the
user should follow the same basic procedure as in the
Sinusoidal Ringing section, but using the following
equations:
RCO is a value which is added or subtracted from the
waveform to ramp the signal up or down in a linear
fashion. This value is a function of rise time, period, and
amplitude, where rise time and period are related
through the following equation for the crest factor of a
trapezoidal waveform.
where T = ringing period, and CF = desired crest factor.
For example, to generate a 71 V
PK
, 20 Hz ringing
signal, the equations are as follows:
For a crest factor of 1.3 and a period of 0.05 sec
(20 Hz), the rise time requirement is 0.0153 sec.
In addition, the user must select the trapezoidal ringing
waveform by writing TSWS = 1 in direct Register 34.
Ringing DC voltage Offset
A dc offset can be added to the ac ringing waveform by
defining
the
offset
voltage
Register 19). The offset, V
ROFF
, is added to the ringing
signal when RVO is set to 1 (direct Register 34, bit 1).
The value of ROFF is calculated as follows:
in
ROFF
(indirect
Linefeed Considerations During Ringing
Care must be taken to keep the generated ringing signal
within the ringing voltage rails (GNDA and V
BAT
) to
maintains proper biasing of the external bipolar
transistors. If the ringing signal nears the rails, a
distorted ringing signal and excessive power dissipation
in the external transistors will result.
To prevent this invalid operation, set the VBATH value
(direct Register 74) to a value higher than the maximum
peak ringing voltage. The discussion below outlines the
considerations and equations that govern the selection
of the VBATH setting for a particular desired peak
ringing voltage.
First, the required amount of ringing overhead voltage,
V
OVR
, is calculated based on the maximum value of
current through the load, I
LOAD,PK
, the minimum current
gain of Q5 and Q6, and a reasonable voltage required
to keep Q5 and Q6 out of saturation. For ringing signals
up to V
PK
= 87 V, V
OVR
= 7.5 V is a safe value.
However, to determine V
OVR
for a specific case, use the
equations below.
where:
N
REN
is the ringing REN load (max value = 5),
I
OS
is the offset current flowing in the line driver circuit
(max value = 2 mA), and
V
AC,PK
= amplitude
of the ac ringing waveform.
It is good practice to provide a buffer of a few more
milliamperes for I
LOAD,PK
to account for possible line
time
V
ROFF
T=1/freq
t
RISE
V
TIP-RING
RNGY
1
2
--
Period 8000
=
RNGX
Desired V
96 V
-----------------------------------
2
15
(
)
=
RCO
t
RISE
8000
-------------------------------
=
t
RISE
3
4
--
T 1
CF
2
----------
–
=
RNGY 20 Hz
)
1
2
--
20 Hz
---------------
8000
200
C8h
=
=
=
RNGX 71 V
PK
)
96
------
2
15
24235
5EABh
=
=
=
RCO 20 Hz
,
1.3 crest factor
0.0153 8000
)
-----------------------------------
396
018Ch
=
=
=
ROFF
V
96
-----------------
2
15
=
I
LOAD
,
PK
V
R
LOAD
-------------------
I
OS
+
V
AC
,
PK
N
6.9 k
-----------------
I
OS
+
=
=
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| SI3210M-KT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3210M-BT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3210 | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3210-BT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
| SI3210-KT | PROSLIC PROGRAMMABLE CMOS SLIC/CODEC WITH RINGING/BATTERY VOLTAGE GENERATION |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| Si3211-BT | 功能描述:電信線路管理 IC Single-Channel SLIC/ Codec RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| SI3211-BTR | 制造商:Silicon Laboratories Inc 功能描述: |
| Si3211-E-FT | 功能描述:電信線路管理 IC Single-Channel SLIC/Codec RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| SI3211-E-FTR | 功能描述:電信線路管理 IC Single-CH SLIC/Codec DTMF Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
| Si3211-E-GM | 功能描述:電信線路管理 IC SNGL-Ch SLIC/Code WITH DTMF Decoder RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
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