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MH88520-1 の電気的特性と機能

MH88520-1のメーカーはMitel Networksです、この部品の機能は「German Subscriber Line Interface Circuit (SLIC) Preliminary Information」です。


製品の詳細 ( Datasheet PDF )

部品番号 MH88520-1
部品説明 German Subscriber Line Interface Circuit (SLIC) Preliminary Information
メーカ Mitel Networks
ロゴ Mitel Networks ロゴ 




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MH88520-1 Datasheet, MH88520-1 PDF,ピン配置, 機能
MH88520-1
®
German Subscriber Line Interface Circuit (SLIC)
Preliminary Information
Features
• Differential to single ended conversion
• Transformerless 2-2 wire conversion
• Minimum installation space
• Off-Hook detection and LED indicator drive
• Relay drive output
• Battery and ringing feed to line
• Logic interface: MUTE, SHK, RRC
• Mute of incoming audio
• Dial pulse detection
• Voltage surge protection
• German complex input impedance
Applications
Line Interface for:
• Intercoms
• Key Systems
• PABX
ISSUE 4
Ordering Information
April 1995
MH88520-1 20 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88520-1 German Subscriber Line
Interface Circuit provides a complete interface
between the telephone line and a speech switch
requiring only single bidirectional switch per
crosspoint. The functions provided by the
MH88520-1 include bidirectional differential to single
ended conversion in the speech path, line battery
feed, ringing feed and loop and dial pulse detection.
The device is fabricated as a thick film hybrid in a
20-pin ‘single-in-line’ (SIL) package allowing
optimum circuit board packing density and very high
reliability.
TIP (A)
RING (B)
RING FEED 1
RING FEED 2
VRLY
RRD
RRC
RGND
Loop Feed/
Ring Feed
Speech Circuit
Relay Drive
Circuit
Loop Detection
VBAT AGND VDD VEE
Figure 1 - Functional Block Diagram
JUNC
MUTE
SHK
LED
THRESH ADJ
2-63

1 Page





MH88520-1 pdf, ピン配列
Preliminary Information
MH88520-1
Functional Description
The BORSH Functions
The MH88520-1 performs all of the Borsh functions
of Battery Feed Overvoltage Protection, Ringing,
Supervision and Hybrid (2-2 Wire).
Return Loss at Tip-Ring
the SLIC, and converts the ground referenced input
signal at JUNC of the SLIC into the non-balanced
output signal at Tip-Ring of the telephone line.
Mute
A logic low at the MUTE input results in muted
signals coming from Tip and Ring to the JUNC
terminal while allowing signals from the JUNC
terminal to Tip and Ring to be transmitted.
To maximise return loss, the impedance at Tip-Ring
should match the SLIC’s impedance (220R + 820R //
115nF). However, the SLIC’s input impedance is
dependent on the JUNCTOR termination resistance.
Therefore the JUNCTOR must be terminated with
754.
Figure 3 illustrates a typical connection between two
SLICs through two crosspoint switches. Optimum
return loss occurs when the JUNCTOR is terminated
with 754. Since the JUNCTOR input/output
impedances is 604and the crosspoint switch
resistances are 75+ 75, this configuration gives
optimum return loss as shown in Figure 4.
Hybrid
The 2-2 wire hybrid circuit converts the incoming
balanced signal at Tip and Ring of the telephone line
into a ground referenced output signal at JUNC of
Overvoltage Protection
The MH88520-1 is protected from short term (1ms)
(+250V) between Tip and Ring, Tip and Ground, and
Ring and Ground. However, additional protection
circuitry may be needed depending upon the
requirements which must be met for the final
equipment.
Loop Detection
The loop detection circuit determines whether a low
enough path is across Tip and Ring to be recognised
as an off-hook condition. (Threshold impedance =
5.4kwith no adjustment). This threshold level can
be adjusted by the use of external resistors as
shown in Figure 6. When an off-hook condition
occurs the SHK and LED outputs toggle to a logic
low level. These outputs also toggle during incoming
dial pulses.
TIP
RING
TIP
RING
1 MH88520-1
TIP
JUNC
3
RING
SLIC 1
16
1 MH88520-1
TIP
8
RING
JUNC
16
SLIC 2
75
CROSSPOINT
SWITCH
75
CROSSPOINT
SWITCH
Figure 3 - SLIC Crosspoint Switch Connection
2-65


3Pages


MH88520-1 電子部品, 半導体
MH88520-1
Preliminary Information
DC Electrical Characteristics
Characteristics
Sym Min TypMax Units
Test Conditions
1 S Operating Supply Voltages
U
P
P
2 L Operating Supply Currents
Y
VDD 4.5 5 5.5 V
VEE -5.5 -5 -4.5 V
VBat -30 -24 -20 V
IDD 8 mA On Hook
IEE 6 mA
IBat 1 mA
3 High Level Input Voltage
MUTE VIH
2.0
RRC VIH
4.5
V
V
4 I Low Level Input Voltage
N MUTE
P RRC
U
5 T High Level Input Current
S MUTE
RRC
VIL
VIL
IIH
IIH
6 Low Level Input Current
MUTE
RRC
IIL
IIL
7 Sink Current
LED
RRD
ILED
IRRD
8 Relay to VDD
O Diode Clamp Current
U
T
P
9 U High Level Output Voltage
T SHK
S
10 Low Level Output Voltage
SHK
IRLY
VOH
VOL
0.8 V
0.5 V
-28 µA
700 µA
100 µA
10 µA
1.5 mA VRLY = RRC= 5V
65 100 200 mA RGND = 0V
VRRD < 1.5V
65 100
mA RRC=RGND=0V
VRLY = 5V
VRRD > 4.5V
4.5 5 5.5 V LED Unconnected
0 .01 0.7 V LED Unconnected
11 Low Level Output Current
IOL
4 µA
12 Power Consumption
PC
mW 400Loop
13 Max. Operating loop RL 600 at 18mA, 24V
RL 900 at 18mA, 30V
‡ Typical figures are at 25°C with nominal+ 5V supplies and are for design aid only: not guaranteed and not subject to production testing.
.
MH88520 Input Impedance
Variant
01
Country
GERMANY
Impedance
220+ 820// 115nF
2-68

6 Page



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部品番号部品説明メーカ
MH88520-1

German Subscriber Line Interface Circuit (SLIC) Preliminary Information

Mitel Networks
Mitel Networks


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