2024年4月12日发(作者：)

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MH89101

PassiveLineTerminationCircuit

Advance Information

Features

•

•

•

Passive Line Termination (PLT) for MT8910

DSLIC

High precision trimmed resistors

Excellent resistor matching required to meet

longitudinal balance as specified in ANSI-

T1.601

Compact SIL package

ISSUE 1August 1991

Ordering Information

MH89101 6 Pin SIL Package

0°C to +70°C

Description

The MH89101 is a thick film hybrid device which is

used in conjunction with the MT8910 to perform two

to four wire conversion and analog signal

conditioning on the received 2B1Q signal.

•

Applications

•

•

•

•

Pair gain system

ISDN NT1 and NT2 interfaces

Digital multiplexers and concentrators

ISDN U-interface terminals

The signal conditioning is necessary to enable the

DSLIC to interface to the Digital Subscriber Line as

defined in ANSI T1.601-1988. The precanceller

block will perform two to four wire conversion and

provide adequate isolation between transmit and

receive paths.

The small size and the precise resistor matching on

the hybrid makes it suitable for line card or terminals

which use the MT8910 2B1Q U-Interface

Transceiver.

TXin +

XFM +

RXout -

Compensator

Circuit

Precanceller

RXout +

XFM -

TXin -

Figure 1 - Functional Block Diagram

9-29

元器件交易网

MH89101

Advance Information

TXin +

XFM +

RXout +

RXout -

XFM -

TXin -

1

2

3

4

5

6

(component side)

Figure 2 - Pin Connections

Pin Description

Pin #

1

2

3

4

5

6

Name

TX

in+

XFM+

RX

out+

RX

out-

XFM-

TX

in-

Description

Transmit Line Signal Input. Must be connected to the L

out+

output of the DSLIC.

Transformer. Node of the 2 to 4 wire converter which must be connected to the primary of

the line transformer.

Receive Line Signal Output. Output of the compensator circuit which must be connected

to the L

in+

input of the DSLIC.

Receive Line Signal Output. Output of the compensator circuit which must be connected

to the L

in-

input of the DSLIC.

Transformer. Node of the 2 to 4 wire converter which must be connected to the primary of

the line transformer.

Transmit Line Signal Input. Must be connected to the L

out-

output of the DSLIC.

9-30