®
MH88620IN
C.O. SLIC
Preliminary Information
Features
•
•
•
•
•
•
•
•
•
•
•
600 ohm input impedance
Externally selectable network balances
Transformerless 2-4 wire conversion
Programmable constant resistance feed
Off-hook and dial pulse detection
High immunity to externally induced longitudinal
currents
Auto ring trip
On-hook transmission (ANI) capability
Minimum protection circuitry required
Compatible with requirements of CDOT DOC/
FCC, CSA/UL,CCITT
Excellent power dissipation (SIL vertical
mounting)
MH88620IN
ISSUE 3
April 1995
Ordering Information
40 Pin SIL Package
0°C to 70°C
Description
The Mitel MH88620IN SLIC provides all of the
functions required to interface 2-wire off premise
subscriber loops to a serial TDM, PCM, switching
network of a modern PBX. The MH88620IN is
manufactured using thick film hybrid technology
which offers high voltage capability, reliability and
high density resulting in significant printed circuit
board area savings. A complete line card can be
implemented with very few external components.
Applications
•
•
On/Off-Premise PBX Line Cards
Central Office Line Cards
VBat
LGND
LCA
VDD
VEE
AGND
RING
RF1
RF2
TIP
TF1
TF2
Matched
Feed
Resistors
Driver
Circuitry
and
Speech
Circuit
Loop
Current
Set
Switch-Hook
Threshold Set
Ring
Filter
SHK
Switch-Hook
Detect
2W/4W
Auto Ring
Trip
Impedance
Network
conversion
N1
N2
TRD
Test Relay
Driver
Ring Relay
Driver
Gain Adjust
TRC RGND VRLY RNGC RRD
Z1
Z2
GRX1 GRX0 RX GTX1 GTX0 TX
Figure 1 - Functional Block Diagram
2-159
MH88620IN
TIP
RING
TF1
TF2
RF1
RF2
LGND
LCA
VBAT
NC
RGND
VRLY
RRD
RNGC
NC
TRD
TRC
AGND
NC
N1
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
N2
NC
Z1
Z2
TX
RX
GTX0
GTX1
GRX0
GRX1
NC
NC
NC
SHK
IC
IC
IC
IC
VEE
VDD
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
Preliminary Information
Figure 2 - Pin Connections
Pin Description
Pin #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
Name
TIP
RING
TF1
TF2
RF1
RF2
LGND
LCA
V
Bat
RS1
RGND
VRLY
RRD
RNGC
RS2
TRD
TRC
AGND
NC
N1
N2
Description
Tip Lead.
Connects to the TIP lead of the subscriber line.
Ring Lead:
Connects to the Ring lead of the subscriber line.
Tip Feed 1:
Access point for balanced ringing. Normally connects to TF2.
Tip Feed 2:
Access point for balanced ringing. Normally connects to TF1.
Ring Feed 1:
Access point for balanced ringing. Normally connects to RF2.
Ring Feed 2:
Access point for balanced ringing. Normally connects to RF1.
Battery Ground.
V
BAT
return path. Connected to system’s energy dumping ground.
Current Limit Set (Input):
The current limit is set by connecting an external resistor as
shown in Table 5. For 70mA default current, this pin is tied to -5V.
Battery Voltage:
Typically -48V dc is applied to this pin.
Ring Sense Resistor Connection 1.
See Figure 7a.
Ring Driver Ground Connection.
Relay Supply Voltage Connection.
Ring Relay Drive (Output).
Connects to ring relay coil.
Ring Relay Control (Input).
Ring Sense Resistor Connection 2.
See Figure 7a.
Test Relay Drive (Output):
Connects to test relay coil.
Test Relay Control (Input).
Analog Ground:
V
DD
and V
EE
.
return path.
No Connection:
Reserved.
Network Balance Node 1.
An external network balance impedance can be connected
between N1 and AGND. See Fig 4. for complex impedances. N2 no connection.
Network Balance Node 2.
See Fig 4. N2 connects to GND for 600Ω balance. N1 no
connection.
2-160
Preliminary Information
Pin Description (Continued)
Pin #
22
23
24
25
26
27
28
29
30
31
32
33
34
35,38
39
40
Name
NC
Z1
Z2
TX
RX
GTX0
GTX1
GRX0
GRX1
NC
NC
NC
SHK
IC
VEE
VDD
No Connection.
Reserved.
Line impedance Node 1.
Normally connects to Z2. See Fig. 3.
Line impedance Node 2.
Normally connects to Z1. See Fig 3.
Transmit (Output)
.
4-wire (AGND) referenced audio output.
Receive (Input).
4-wire (AGND) referenced audio input.
Transmit Gain Node 0.
Connects to GTX1 for 0dB transmit gain.
Description
MH88620IN
Transmit Gain Node 1.
Connects to a resistor to AGND for transmit gain adjustment.
Receive Gain Node 0.
Connects to GRX1 for 0dB gain.
Receive Gain Node 1.
Connect to a resistor to AGND for receive gain adjustment.
No Connection.
Reserved.
No Connection.
Reserved.
No Connection.
Reserved.
Off-Hook Indication (Output).
A logic low output indicates when the subscriber
equipment has gone Off-Hook.
Internal Connection.
Negative Supply Voltage.
-5V dc.
Positive Supply voltage.
+5V dc
2-161
MH88620IN
Preliminary Information
Absolute Maximum Ratings *
All voltages are with respect to GNDA unless otherwise stated.
Parameter
1
Supply Voltages
Symbol
LGND -V
Bat
V
DD -
GND
GND - V
EE
T
S
Min
Max
65
6
6
+125
Units
V
V
V
˚C
2
Storage Temperature
-40
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
Recommended Operating Conditions
†
-
Voltages are with respect to GNDA unless otherwise stated
.
Characteristics
1
2
Operating Temperature
Supply Voltages
Sym
T
OP
V
Bat*
V
DD
V
EE
Min
0
-44
4.75
-4.75
-48
+5.0
-5.0
Typ*
Max
70
-60
5.25
-5.25
Units
˚C
V
V
V
Comments
* Typical figures are at 25˚C and are for design aid only; not guaranteed and not subject to production testing.
† Voltages specified are with respect to LGND.
DC Electrical Characteristics*
Characteristics
1
Sym
I
Loop
Min
17
16
Typ
‡
Max
70
Units
mA
mA
mA
mA
Test Comments
R
Loop
= 0Ω, LCA = -5V
1500Ω
2000Ω V
Bat
= -48V
Operating Loop Current
2
Variation in Loop current
from nominal
Operating Current
I
Loop
±2
2
15
15
2
250
0.5
3.7
0.8
2.4
20
20
I
Bat
I
DD
I
EE
Power Dissipation
3
SHK
mA
mA
mA
W
mW
V
V
V
V
µA
µA
R
Loop
= Open (On-hook)
On-Hook or Off-Hook
On-Hook or Off-Hook
Active
Stand-by/Idle
I
OL
= 400µA
I
OH
= 40µA
PDo
PD1
V
OL
Low Level Output Voltage
High Level Output Voltage
Low Level Input Voltage
High Level Input Voltage
Low Level Input Current
High Level Input Current
V
OH
V
IL
V
IH
I
IH
I
IL
4
5
RNGC
TRC
V
IH
= 5.0V
V
IL
= 0.0V
* DC Electrical Characteristics are over recommended operating conditions unless otherwise stated.
‡ Typical figures are at 25˚C with nominal
±
5V supplies and are for design aid only.
2-162
Preliminary Information
AC Electrical Characteristics*
Characteristics
1
2
3
4
MH88620IN
Sym
Min
Typ
‡
0
0
25
Max
Units
dB
dB
V
RMS
Test Comments
Externally adjustable
Externally adjustable
R
Loop
= 1400Ω
Term. 6.8µF +200Ω
V
Bat
= -48V
T-R load = 10Ωk min.
Dial Pulse Detection
Adjustable
300-500Hz
500-2500Hz
2500-3400Hz
Analog Tx Gain (T-R to TX)
Analog Rx Gain (RX to T-R)
Ringing Capability
On-hook Transmission
Signal input level
Gain
SHK Rise Time
Fall time
2 Wire Termination Impedance
Off-Hook Detect Threshold
2-Wire Return Loss
600Ω at T-R
20
26
20
t
R
4
t
F
1
1
600
10
2.0
8
V
RMS
dB
msec
msec
Ω
mA
dB
dB
dB
5
6
7
8
9
Longitudinal Balance
Longitudinal to Metallic
58
55
53
40
N
CR
N
CX
THL
16
20
16
4
90
30
+.25
+.2
8
12
dB
dB
dB
mA
dBrnC
dBrnC
2000Hz, 1000Hz
2000Hz, 3000Hz
3400Hz
20mA per lead
10
11
12
Longitudinal Current Capability
Idle Channel Noise
Rx to T-R
T-R to Tx
Transhybrid Loss
Tx gain 0dB
Rx gain 0dB
dB
dB
dB
dBm
V
RMS
Hz
ms
dB
dB
dB
13
14
15
16
17
18
19
Analog Signal Overload Level at
TIP and RING
Ringing Signal Voltage
Ringing Frequency
Ring Trip Delay
Absolute Gain variation
Relative Gain, reference to 1kHz
Power Supply Rejection Ratio
V
Bat
V
DD
V
EE
300-500Hz
500-2500Hz
2500-3400Hz
T-R = 900Ω
V
Bat
= -48V
70
20
-25
-2
PSRR
24
24
24
80
25
100
0
0
30
30
30
0dBm at T-R, 1kHz
300-3400Hz
1kHz, 100mVpp
* AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡ Typical figures are at 25°C with nominal
±
5V supplies and are for design aid only.
Note: Test Conditions use a transmit and receive gain set to 0dB default and a Z
in
value of 600Ω unless otherwise stated.
“Ref” indicates reference impedance which is equivalent to the termination impedance.
“Net” indicates network balance impedance.
2-163
电路观察室
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
