XR-T5794 查看數據表（PDF） - Exar Corporation

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XR-T5794

Quad E-1 Line Interface Unit

Exar Corporation 

XR-T5794

BLOCK DIAGRAM

Impedance

Selectable

Tristate Drivers

Return Loss

Exceeds

ETSI 300 166

75Ω Unbalanced

(Without Transformer)

Impedance Selectable

Receivers. Return Loss

Exceeds G.703

TIP

0.47mF

75

120Ω Balanced

(or 100Ω ) TIP

RX INPUT

RING

PE–65834

TTI 7148

RXIN

100

or

120

E1/T1-

LOS Threshold Based on G.775

LOOPEN(1.4)

LPMOD(1.4)

120Ω ,100Ω or 75Ω

balanced TIP

TX OUTPUT

RING

PE–65839

TTI 7149

TXOUT

ROUT1

TXEN

Level

Detector

Peak

Detector Slice

Voltage

Driver

Transceiver 1

Transceiver 2

Transceiver 3

Transceiver 4

LOS

Slicer

2

L

o

c RXPOS

a

l

/ RXNEG

R

e

m

o

t

e

L

o TXPOS

o

p TXNEG

b TXCLK

a

c

k

75Ω Unbalanced

(Without Transformer)

TIP

0.47µF ROUT1

Channel 1

Channel 2

Channel 3 MUX

Channel 4

Driver

MOUT

MSEL (0.2)

MONEM

Note

1ROUT = 68Ω for 120Ω line impedance, ROUT = 62Ω for 100Ω line impedance, ROUT = 68Ω for 75Ω line impedance

Figure 1. Block Diagram

Rev. 2.01

2

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