Preliminary Information
Loop Electrical Characteristics
†
-
Characteristics
1
2
3
Maximum AC Ringing
x
Current Rejection
Ring Trip Detect Time
y
Hook Switch Detect Time:
Off-Hook to On-Hook
On-Hook to Off-Hook
Operating Loop Currents
Maximum Operating Loop Current
Operating Loop Resistance
Loop Current at Off-Hook
z
Detect Threshold
I
IP
R
IP
I
SH
18
0
0
7
10
22
50
Sym
Min
33
100
20
20
26
1850
2300
13
Typ
‡
Max
Units
mA
ms
ms
ms
mA
Ω
Ω
mA
MH89625C
Test Conditions
25Hz, V
BAT
= -48V
4
5
6
LCA= Open
LCA= 30k to V
EE
V
BAT
= -40V
V
BAT
=-48V
† Loop 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.
x
The SLIC can be loaded with an AC impedance as low as 4000Ω without generating a false SHK output. Since each REN
represents 8kΩ, the SLIC can drive a REN of 2 without generating a false SHK output.
y
This parameter is over Recommended Operating Conditions as well as the specified Operating Loop Resistance.
z
Off-Hook Detect (SHK) will be detected for loop lengths of 2900Ω or less.
AC Electrical Characteristics
†
Characteristics
1
2-wire Input Impedance
x
(Magnitude)
(Magnitude)
2
600R
560 Network
680 Network
14
18
14
40
46
16
20
16
PSRR
V
DD
V
EE
V
BAT
Sym
Z
in
600
720
813
23
24
35
54
51
52
41
52
Min
Typ
‡
Max
Units
Ω
Ω
Ω
dB
dB
dB
dB
dB
dB
dB
dB
300 Hz
500-2000 Hz
3400 Hz
300-600 Hz
600-3400 Hz
300 Hz
500-2500 Hz
3400 Hz
Test Conditions
1020 Hz
Return Loss at 2-Wire
y
3
4
Longitudinal to Metallic
Balance
Transhybrid Loss
5
Power Supply Rejection Ratio
at 2-Wire and DSTo:
Ripple 50mV
1020 Hz
20
20
20
40
30
40
dB
dB
dB
† AC Electrical Characteristics are over Recommended Operating Conditions unless otherwise stated.
‡ Typical figures are at 25°C and are for design aid only.
x
Three impedance selections of Z
in
= 600Ω, Z
in
=200Ω + 560 // 0.1µF, and Z
in
=200Ω + 680 // 0.1µF are available.
y
Values apply for all three impedances selections; in all three cases Z
in
= Reference Impedance.
Note 1: All of the above test conditions use 200Hz to 3400 Hz unless otherwise stated.
Note 2: The transmit codec gain is set to 0dB, the receive codec gain is set to 0dB, and the receive gain adjustment is set to 0dB
(GS=5V), unless otherwise specified.
Note 3: With the transmit and receive gains set to 0dB; 0dBmO at the DSTi input will appear as 0dBm at the Tip-Ring output; 0dBm at
the Tip-Ring input will appear as 0dBmO at the DSTo output.
Note 4 All dBm is referenced to 600Ω.
2-275
MITEL [ MITEL NETWORKS CORPORATION ]
