MH88400
Preliminary Information
Absolute Maximum Ratings* - All voltages are with respect to AGND unless otherwise specified.
Parameter
Symbol
Min
Max
1 DC Supply Voltage
VDD
-0.3
6
2 Storage Temperature
TS
-55
+80
3 DC Loop Voltage
VBAT
-100
+100
4 Ringing Voltage
VR
-
120
5 Loop Current
ILoop
-
90
* Exceeding these values may cause permanent damage. Functional operation under these conditions is not implied.
.
Units
V
°C
V
VRMS
mA
Recommended Operating Conditions
Parameters
Sym Min Typ‡ Max
1 DC Supply Voltages
VDD
4.5
5.0
5.5
2 Operating Temperature
TOP
0
70
3 Ringing Voltage
VR
75
‡ Typical figures are at 25°C with nominal +5V supplies and are for design aid only.
Units
V
°C
VRMS
Test Conditions
VBAT=-48V
Loop Electrical Characteristics*
Characteristics
Sym Min Typ‡ Max Units
Test Conditions
1 Ringing Voltage
2 Ringing Frequency
No Detect VR
Detect
27
15
20 VRMS
VRMS
68
Hz
3 On-Hook 2-wire Impedance
40k
Ω
4 Operating Loop Current
10
80 mA
5 Operating Loop Resistance
4000 Ω
6 Off-Hook DC
Resistance
-1 & -2 Variants
-3 Variant
310 350 480
Ω
160 300 480
Ω
250 300
Ω
400 450
Ω
7 Leakage Current (2-Wire to AGND)
10
µA
8 Leakage Current on Hook
(Tip to Ring)
9
10
µA
9 DC Resistance during dialling
-1 variant
200
Ω
220
10 Dial Pulse Distortion
ON
Off
0
+4 +8 ms
0
+2 ms
* Loop Electrical Characteristics are over recommended operating conditions unless otherwise stated.
‡ Typical figures are at 25°C and are for design aid only.
Note: All of the above characteristics use a test circuit as per Figure 3.
1kHz
VBAT=-48V, ILoop=10mA
ILoop=20mA
ILoop=40mA
ILoop=40mA
ILoop=20mA
100VDC
VBAT=50V
ILoop=20-40mA
2-14