- 您現在的位置：買賣IC網 > PDF目錄367494 > L9217A CAP CER 2700PF 3.15KVDC R3 RAD PDF資料下載
參數資料
| 型號： | L9217A |
| 英文描述： | CAP CER 2700PF 3.15KVDC R3 RAD |
| 中文描述： | 低成本線接口，具有反向電池和PPM |
| 文件頁數： | 19/30頁 |
| 文件大小： | 414K |
| 代理商： | L9217A |
第1頁第2頁第3頁第4頁第5頁第6頁第7頁第8頁第9頁第10頁第11頁第12頁第13頁第14頁第15頁第16頁第17頁第18頁當前第19頁第20頁第21頁第22頁第23頁第24頁第25頁第26頁第27頁第28頁第29頁第30頁
Agere Systems Inc.
19
Data Sheet
November 2001
with Reverse Battery and PPM
L9217A/G Low-Cost Line Interface
Applications
(continued)
dc Applications
Battery Feed
The dc feed characteristic can be described by:
where:
I
L
= dc loop current.
V
T/R
= dc loop voltage.
|
V
BAT
|
= battery voltage magnitude.
V
OH
= overhead voltage. This is the difference between
the battery voltage and the open loop tip/ring
voltage.
R
L
= loop resistance, not including protection resistors.
R
P
= protection resistor value.
R
dc
= SLIC internal dc feed resistance.
Note: V
BAT
= –48 V; I
LIM
= 22 mA; R
dc1
= 115
.
Figure 13. Loop Current vs. Loop Voltage
Starting from the on-hook condition and going through
to a short circuit, the curve passes through the follow-
ing two regions:
Region 1: On-hook and low-loop currents. The slope
corresponds to the dc resistance of the SLIC, R
dc1
(default is 72
typical). The open circuit voltage is
the battery voltage minus the overhead voltage of the
device, V
OH
(default is 6.5 V typical). These values are
suitable for most applications but can be adjusted if
needed.
Region 2: Current limit. The dc current is limited to a
starting value determined by external resistor R
PROG
,
an internal current source, and the gain from tip/ring to
pin VITR. Current limit with a 100
load is set by the
following equation:
0.637 R
PROG
(k
) + 2 mA = I
LIM
x (mA)
Overhead Voltage
In order to drive an on-hook ac signal, the SLIC must
set up the tip and ring voltage to a value less than the
battery voltage. The amount that the open loop voltage
is decreased relative to the battery is referred to as the
overhead voltage. This is expressed as the following
equation:
V
OH
= |V
BAT
| – (V
PT
– V
PR
)
Without this buffer voltage, amplifier saturation will
occur and the signal will be clipped. In modes without
PPM, the L9217 is set to allow undistorted on-hook
transmission of a 3.17 dBm signal into a 900
loop
impedance. A minimum 11.1 V overhead is needed to
pass 3.5 Vrms meter pulse.
In high overhead and PPM modes, overhead is auto-
matically increased to accommodate on-hook trans-
mission of meter pulse signals. The increase in
overhead is set by a resistor from pin OVH to ground.
This is expressed as the following equation:
V
OVH
(V) = 6.37 + 0.09535 x R
OVH
(k
)
I
L
R
L
+
R
dc
+
2R
P
---------------------------------
=
V
T/R
R
L
2R
P
---------------------------------------------
R
dc
L
+
+
=
0
10
20
50
0
20
30
40
50
LOOP VOLTAGE (V)
30
40
10
L
1
12.5 k
–1
R
dc1
I
LIM
TESTED
I
LIM
ONSET
12-3050 (F).i
相關PDF資料 |
PDF描述 |
|---|---|
| L9218A | CAP CER 330PF 3.15KVDC R3 RAD |
| L9219A | CAP CER 390PF 3.15KVDC R3 RAD |
| L9310 | Line Interface and Line Access Circuit Full-Feature SLIC,Ringing Relay,and Test Access Device |
| L9311 | Line Interface and Line Access Circuit Full-Feature SLIC with High Longitudinal Balance, Ringing Relay,and GR-909 Test Access |
| L9312 | Line Interface and Line Access Circuit Forward Battery SLIC and Ringing Relay for TR-57 Applications |
相關代理商/技術參數 |
參數描述 |
|---|---|
| L9218A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface |
| L9219A | 制造商:AGERE 制造商全稱:AGERE 功能描述:Low-Cost Line Interface with Reverse Battery and Dual Current Limit |
| L9222 | 功能描述:功率驅動器IC Quad Inv Tran Switch RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| L9222_04 | 制造商:STMICROELECTRONICS 制造商全稱:STMicroelectronics 功能描述:QUAD INVERTING TRANSISTOR SWITCH |
| L9222D | 功能描述:功率驅動器IC Quad Inv Tran Switch RoHS:否 制造商:Micrel 產品:MOSFET Gate Drivers 類型:Low Cost High or Low Side MOSFET Driver 上升時間: 下降時間: 電源電壓-最大:30 V 電源電壓-最小:2.75 V 電源電流: 最大功率耗散: 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
發布緊急采購，3分鐘左右您將得到回復。