MH88400-1 Просмотр технического описания (PDF) - Mitel Networks

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MH88400-1

Line Interface Circuit

Mitel Networks 

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

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