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參數(shù)資料
| 型號(hào)： | HC-5502B |
| 廠商： | Intersil Corporation |
| 英文描述： | EIA/ITU PABX SLIC with 30mA Loop Feed |
| 中文描述： | 環(huán)境影響評(píng)估/國(guó)際電聯(lián)交換機(jī)用戶接口以30mA環(huán)路飼料 |
| 文件頁(yè)數(shù)： | 6/9頁(yè) |
| 文件大?。?/td> | 84K |
| 代理商： | HC-5502B |
52
Functional Diagram
24
20
+IN
The non-inverting analog input of the spare operational amplifier.
25
21
RX
Receive Input, 4-Wire Side - A high impedance analog input which is internally biased. Capacitive
coupling to this input is required. AC signals appearing at this input differentially drive the Tip feed
and Ring feed amplifiers, which in turn drive tip and ring through 300
of feed resistance on each
side of the line.
26
22
C
4
Capacitor #4 - An external capacitor to be connected between this terminal and analog ground. This
capacitor prevents false ground key indication and false ring trip detection from occurring when lon-
gitudinal currents are induced onto the subscriber loop from nearby power lines and other noise
sources. This capacitor is also required for the proper operation of ring trip detection. Typical value
is 0.5
μ
F to 1.0
μ
F, 20V. This capacitor should be nonpolarized.
27
23
AG
(Note 5)
Analog Ground - To be connected to zero potential and serves as a reference for the transmit output
(TX) and receive input (RX) terminals.
28
24
TX
Transmit Output, 4-Wire Side - A low impedance analog output which represents the differential volt-
age across Tip and Ring. Transhybrid balancing must be performed (using the SLIC microcircuit’s
spare op amp) beyond this output to completely implement two to four wire conversion. This output
is unbalanced and referenced to analog ground. Since the DC level of this output varies with loop
current, capacitive coupling to the next stage is essential.
1, 8, 5, 22
NC
No internal connection.
NOTE:
5. All grounds (AG, BG, and DG) must be applied before V
B
+ or V
B
-. Failure to do so may result in premature failure of the part. If a user wishes
to run separate grounds off a line card, the AG must be applied first.
Pin Descriptions
(Continued)
28 PIN
PLCC
24 PIN
DIP/SOIC
SYMBOL
DESCRIPTION
RING
RELAY
LOOP
CURRENT
LIMITER
BATTERY
FEED
DIFF
AMP
OP
AMP
LOOP
MONITORING
RING
CONTROL
2 WIRE
LOOP
SECONDARY
PROTECTION
-1
LINE
DRIVERS
TIP
RING
V
B
-
V
B
-
PD
POWER DENIAL
150
RING
150
RF
BG
150
TF
TIP
RD
RC
RS
RING
VOLTAGE
RING SYNC
RING COMMAND
RING
TRIP
SHD
GKD
TX
TRANSMIT
OUTPUT
OUT
+IN
-IN
RX
RECEIVE
INPUT
SLIC MICROCIRCUIT
150
SWITCH HOOK
DETECTION
GROUND KEY
DETECTION
+
-
+1
+
-
HC-5502B
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| HC-5502B_03 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:EIA/ITU PABX SLIC with 30mA Loop Feed |
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