MITEL MH88524 Datasheet

MH88524



Dual 2-4 Wire Circuit

Preliminary Information

Features

• Full duple x operat ion

• Two complete circuits per package

• Transformerless 2-4 W ire (4 -2 Wire) conversi on 5V operation

•+

• Wide bandwidth (50kHz)

• Small Package Size

Applications

4-2 Wire and 2-4 Wire conversion for:

• MH88630/ 631, MH88 632, MH88 50 0 & MT8 840

• PBX

• Key Telephone Sy stem

• Channel b ank

•Voice Mail

• Terminal Equipm ent

• Digital Loop Carrier

• Modem

• Intercom

ISSUE 4 April 1995

Ordering Information

MH88524 10 Pin SIL Pa ckag e

0°C to 70°C

Descript io n

The Mitel MH88524 (Dual 2-4 wire Circuit) provides two independent interfaces between4-Wire devices such as the MH 8 86 3 1 CO IC (Central Offi ce In te rfa c e CIrcuit) and a speech switch such as the MT8814 (Analog Switch Array), requiring only a single bidirectional switch per crosspoint. The MH88524 can accommodate two full duplex audio links. The device is fabricated as a thick film hybrid which incorporates various technologies for optimum circuit design and very high reliability.

RX1

TX1

RX2

TX2

Receive Gain

Circuit1

Transmit Gai n

Circuit 1

Receive Gain

Circuit 2

Transmit Gain

Circuit 2

VDD VEE AGND

Figure 1 - Functiona l Block Dia gram

2-4 Wire

Circuit 1

2-4 Wire Circuit 2

JUN1

JUN2

2-73

MH88524 Preliminary Information

RX1

JUN1

TX1

VDD

AGND

VEE

TX2

JUN2

RX2

1 2 3 4 5 6 7 8 9 10

Figure 2 - Pin Connections

Pin Description

Pin # Name Description

1RX1Receive 1 (Input). 4-Wire ground (AGND) referenced audio out put . 2 JUN1 Junctor 1 (Transmit and Receive). Ground referenced transmit and receive speech path. 3TX1Transmit 1. 4-Wire ground (AGND) referenced audio output. 4VDDPositive Supply Voltage. Typically +5V. 5AGNDAnalog Gr ou nd. 2-Wire and 4-Wire ground . Normally connecte d to System Ground. 6 VEE Negative Su pp ly Voltage. Typically -5V. 7ICInternal Connection. This pin is internally connected. 8TX2Transmit 2 (Output). 4-Wire gro und AGND) referenced audi o outp ut. 9 JUN2 Junctor 2 (Transmit and Receive). Ground referenced transmit and receive speech path.

10 RX2 Receive 2 (Input). 4-Wire ground (AGND) refere nced audio output .

Absolute Maximum Ratings*

Parameter Sym Min Max Un its Comment s

1 DC Supply Voltage V

2 Storage Temperature T

* Exceeding these values ma y cause perm anen t dama ge. Functi onal operati on und er these cond ition s is not implied.

-0.3

+0.315-15

-55 125 °C

With respect LG ND

Recommended Operating Conditions

Parameter Sym T yp* Min Max Units Comments

1 DC Supply Voltage V

2 Operating Temperature T

* Typical figures are at 25°C with nominal +5V supplies and are for design aid only.

EE OP

5.0

-5.0

4.75

-4.7510-10

V V

070°C

2-74

Preliminary Information MH88524

DC Electrical Characteristics

‡

Characteristics Sym Min Typ* Max Uni ts Test Conditions

1 Supply Current I

4 4

mA VDD = +5.0

2 Power Dissipation PC 40 mW V

‡ 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.

AC Electrical Interdependence Characteristics

‡

Characteristics Sym Min Typ* Ma x Units Test Conditions

1 Cross, Circuit 1 or 2

JUN1 to JUN2 JUN1 to TX2 RX1 to JUN2 RX1 to TX2

80 80 80 80

60 60 60 60

dB dB dB dB

2 Crosstalk, Circuit 1 or 2

= 5.0

= +5.0

= 5.0

Input 1.0V 200Hz-3400Hz

200Hz-50kHz

Input 1.0V

JUN1 to JUN2 JUN1 to TX2 RX1 to JUN2 RX1 to TX2

‡ 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.

80 80 80 80

60 60 60 60

dB dB dB dB

200Hz-3400Hz

200Hz-50kHz

2-75

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