Preliminary Information
AC and DC Loop Electrical Characteristics*
Characteristics
1
2
3
Maximum AC Ringing
Current Rejection
x
Ring Trip Detect Time
Operating Loop Current
V
BAT
= -48V
V
BAT
= -23V
Maximum Operating Loop
Resistance
y
V
BAT
= -48V
V
BAT
= -23V
Loop Current at
Off-Hook Detect Threshold
I
IP
R
IP
MH88510/11
Sym
Min
44
125
18
18
2000
600
I
SH
8
9
10
11
12
13
23
23
28
28
Typ
‡
Max
Units
mA
ms
mA
mA
Ω
Ω
µA
µA
R
Loop
< 2000Ω
R
Loop
< 600Ω
I
Loop
= 18mA
I
Loop
= 18mA
V
DD
= 5.0V, V
EE
= -5.0V
V
DD
= 7.0V, V
EE
= -8.0V
Test Conditions
4
5
*
AC and DC 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 2200Ω without generating a false SHK output. Since each REN represents 8kΩ,
the SLIC can drive a REN of 3.6 without generating a false SHK output.
y
See section on Tip-Ring Drive Circuit for driving longer lines.
AC Electrical Characteristics
Characteristics
1
2
3
4
5
Return Loss at 2-Wire
Impedance at Junctor
Longitudinal to Metallic Balance
Longitudinal to Junctor Balance
Signal Output Overload Level
at 2-Wire
at Junctor
6
Total Harmonic Distortion
at 2-Wire
at Junctor
7
Idle Channel Noise
at 2-Wire
at Junctor
8
Power Supply Rejection Ratio at
2-Wire and Junctor
V
DD
V
EE
V
BAT
9
Mute Attenuation
30
PSRR
25
25
25
dB
dB
dB
dB
Input 0.5V MUTE
= 0.0V @1kHz
Nc
12
12
dBrnc
dBrnc
Reference: 600Ω
Reference: 754Ω
Ripple 0.1V 1kHz
THD
1.0
1.0
%
%
3.5
3.5
dBm
dBm
50
50
Sym
Min
20
Typ
‡
30
604
60
60
Max
Units
dB
Ω
dB
dB
40Hz - 4kHz
40Hz - 4kHz
% THD < 5%
Reference: 600Ω
Reference: 754Ω
Input 0.5V 1kHz
Test Conditions
Reference 600Ω
@ 1kHz
‡ Typical figures are at 25°C with nominal + 5V supplies and are for design aid only.
2-59
MITEL [ MITEL NETWORKS CORPORATION ]
