- 您現在的位置：買賣IC網 > PDF目錄379664 > AM79231JC (Electronic Theatre Controls, Inc.) Intelligent Subscriber Line Interface Circuit (ISLIC) PDF資料下載
參數資料
| 型號： | AM79231JC |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | Intelligent Subscriber Line Interface Circuit (ISLIC) |
| 中文描述： | 智能用戶線接口電路（ISLIC） |
| 文件頁數： | 20/28頁 |
| 文件大小： | 278K |
| 代理商： | AM79231JC |
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頁第19頁當前第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
20
Am79231 Data Sheet
Table 2.
Mode Descriptions
Control bits RD1, RD2, and RD3 do not affect the operating mode of the Am79231. These signals
usually perform the following functions.
Table 3.
Driver Descriptions
Operating Mode
Description
Disconnect
This mode disconnects both A and B output amplifiers from the AD and BD outputs. The
A and B amplifiers are shut down and the Am79231 selects the low battery voltage at the
VBL pin. In the Disconnect state, the currents on IMT and ILG represent the voltages on
the SA and SB pins, respectively. These currents are scaled to produce voltages across
V
400
400
RMTi and RLGi of
and
, respectively.
Standby
The power amplifiers are turned off. The AD output is driven by an internal 250
(typical)
resistor, which connects to ground. The BD output is driven by an internal 250
(typical)
resistor, which connects to the high battery (BATH) at the VBH pin, through a clamp circuit,
which clamps at
–
50 V with respect to BGND. For VBH values above
–
55 V, the open-
circuit voltage, which appears at this output is ~VBH + 5 V. If VBH is below
–
55 V, the
voltage at this output is
–
50 V. The battery selection for the balance of the circuitry on the
chip is VBL. Line supervision remains active. Current limiting is provided on each line to
limit power dissipation under short-loop conditions as specified in the
“
Am79231 Current-
Limit Behavior
”
section. In external ringing, the standby ISLIC state is selected.
Tip Open
In this mode, the AD (Tip) lead is opened and the BD (Ring) lead is connected to a clamp,
which operates from the high battery on VBH pin and clamps to approximately
–
50 V with
respect to BGND through a resistor of approximately 250
(typical). The battery selection
for the balance of the circuitry on the chip is VBL. To prevent excessive power dissipation,
the current in the Ring lead is limited by an internal current source to 30 mA.
Active High Battery
In the Active High Battery mode, battery connections are as shown in Table 1. Both output
amplifiers deliver the full power level determined by the programmed DC-feed conditions.
Active High Battery mode is enabled during a call in applications when a long loop can
be encountered.
Active Low Battery
Both output amplifiers deliver the full power level determined by the programmed DC-feed
conditions. VBL, the low negative battery, is selected in the Active Low Battery mode. This
is typically used during the voice part of a call.
On-Hook Transmission
(OHT), Fixed Longitudinal
Voltage
In the On-Hook Transmission, Fixed Longitudinal Voltage mode, battery connections are
as shown in Table 1. The longitudinal voltage is fixed at
–
30 V to allow compliance with
safety specifications for some classes of products.
Driver
Description
R1
A logic 1 on RD1 turns the R1 driver on and operates a relay connected between the R1
pin and VCCD. R1 drives the ring relay.
A logic 1 on the RD2 signal turns the R2 driver on and routes current from the R2 pin to
the RYE pin. In the option where the RYE pin is connected to ground, the R2 pin can sink
current from a relay connected to VCCD.
R2
Another option is to connect the RYE pin to the BD (Ring) lead through a diode and connect
a test load between R2 and the AD (Tip) lead. This technique avoids the use of a relay to
connect a test load. However, it does not isolate the subscriber line from the linecard. The
test load must be connected to the Am79231 side of the protection resistor to avoid
damage to the R2 driver.
---------
--------
相關PDF資料 |
PDF描述 |
|---|---|
| AM8127LTB | AM8127 Clock Generator |
| AMZ8127 | AM8127 Clock Generator |
| AM8127XTB | AM8127 Clock Generator |
| AM8127 | AM8127 Clock Generator |
| AM8127DC | Circular Connector; MIL SPEC:MIL-DTL-38999 Series II; Body Material:Aluminum; Series:MS27508; Number of Contacts:22; Connector Shell Size:12; Connecting Termination:Crimp; Circular Shell Style:Box Mount Receptacle |
相關代理商/技術參數 |
參數描述 |
|---|---|
| AM7924JC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Subscriber Line Interface Circuit |
| AM7924SC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM7926-1VC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM7926-2VC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| AM7926-3VC | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
發布緊急采購，3分鐘左右您將得到回復。