參數(shù)資料
型號： XRT59L921IB
廠商： EXAR CORP
元件分類： 數(shù)字傳輸電路
英文描述： TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
中文描述： DATACOM, PCM TRANSCEIVER, PBGA316
封裝： 21 X 21 MM, STBGA-316
文件頁數(shù)： 3/32頁
文件大?。?/td> 377K
代理商： XRT59L921IB
XRT59L921
I
REV. 1.2.1
TWENTY-ONE CHANNEL E1 LINE INTERFACE UNIT
TABLE OF CONTENTS
GENERAL DESCRIPTION.................................................................................................1
F
EATURES
.....................................................................................................................................................1
A
PPLICATIONS
...............................................................................................................................................1
F
IGURE
1. B
LOCK
D
IAGRAM
OF
THE
XRT59L921 ............................................................................................................................. 1
ORDERING INFORMATION ....................................................................................................................2
F
IGURE
2. P
IN
O
UT
OF
THE
XRT59L921 (
BOTTOM
VIEW
).................................................................................................................. 2
T
ABLE
OF
C
ONTENTS
............................................................................................................
I
P
IN
D
ESCRIPTIONS
........................................................................................................................................3
RECEIVER ELECTRICAL CHARACTERISTICS......................................................................................12
TRANSMITTER ELECTRICAL CHARACTERISTICS...............................................................................12
F
IGURE
3. E1. ITU G.703 P
ULSE
T
EMPLATE
FOR
T
RANSMITTER
O
UTPUT
........................................................................................ 13
DC ELECTRICAL CHARACTERISTICS ...................................................................................................13
AC ELECTRICAL CHARACTERISTICS....................................................................................................14
P
ER
CHANNEL
POWER
CONSUMPTION
INCLUDING
THE
LINE
POWER
DISSIPATION
,
TRANMISSION
AND
RECEIVE
PATHS
ALL
ACTIVE
:.................................................................................................................................................14
A
BSOLUTE
M
AXIMUM
R
ATINGS
.....................................................................................................................14
SYSTEM DESCRIPTION ..........................................................................................................................15
1.0 THE TRANSMIT SECTION ..................................................................................................................15
1.1 THE TRANSMIT INPUT INTERFACE ............................................................................................................ 15
1.2 OPERATING THE TRANSMITTER IN THE CLOCK MODE .......................................................................... 15
F
IGURE
4. I
LLUSTRATION
ON
HOW
THE
XRT59L921 S
AMPLES
THE
DATA
ON
THE
T
X
POS_
N
AND
T
X
NEG_
N
INPUT
PINS
................... 16
1.2.1 OPERATING THE TRANSMITTER IN THE CLOCKLESS MODE............................................................................. 16
1.2.2 SHUTTING OFF THE TRANSMITER.......................................................................................................................... 16
F
IGURE
5. I
LLUSTRATION
ON
HOW
THE
T
ERMINAL
E
QUIPMENT
SHOULD
APPLY
DATA
TO
THE
T
RANSMIT
S
ECTION
OF
A
GIVEN
C
HANNEL
(
WITH
-
IN
THE
XRT59L921),
WHEN
OPERATING
IN
THE
C
LOCKLESS
M
ODE
.................................................................................. 17
1.3 THE PULSE SHAPING CIRCUIT ................................................................................................................... 17
F
IGURE
6. I
LLUSTRATION
OF
THE
ITU-T G.703 P
ULSE
T
EMPLATE
FOR
E1 A
PPLICATIONS
................................................................ 18
1.4 INTERFACING THE TRANSMIT SECTIONS OF THE XRT59L921 TO THE LINE ....................................... 18
F
IGURE
7. I
LLUSTRATION
OF
HOW
TO
INTERFACE
THE
T
RANSMIT
S
ECTIONS
OF
THE
XRT59L921
TO
THE
L
INE
(
FOR
75W A
PPLICATIONS
)
19
F
IGURE
8. I
LLUSTRATION
OF
HOW
TO
INTERFACE
THE
T
RANSMIT
S
ECTIONS
THE
XRT59L921
TO
THE
L
INE
(
FOR
120W A
PPLICATIONS
)19
Transmit Transformer Recommendations................................................................................................................. 19
The following Transformers are Recommended for Use........................................................................................... 20
M
AGNETIC
S
UPPLIER
I
NFORMATION
..............................................................................................................20
2.0 THE RECEIVE SECTION .....................................................................................................................21
2.1 INTERFACING THE RECEIVE SECTIONS TO THE LINE (TRANSFORMER COUPLING) ......................... 21
F
IGURE
9. R
ECOMMENDED
S
CHEMATIC
FOR
I
NTERFACING
THE
R
ECEIVE
S
ECTIONS
OF
THE
XRT59L921
TO
THE
L
INE
FOR
75W A
PPLICA
-
TIONS
(T
RANSFORMER
-C
OUPLING
).................................................................................................................................. 21
F
IGURE
10. R
ECOMMENDED
S
CHEMATIC
FOR
I
NTERFACING
THE
R
ECEIVE
S
ECTIONS
OF
THE
XRT59L921
TO
THE
L
INE
FOR
120W A
PPLI
-
CATIONS
(T
RANSFORMER
-C
OUPLING
).............................................................................................................................. 22
TRANSFORMER RECOMENDATION......................................................................................................23
Receive Transformer Recommendations.................................................................................................................. 23
2.2 INTERFACING THE XRT59L921 RECEIVE SECTION TO THE LINE (CAPACITIVE COUPLING) ............. 23
F
IGURE
11. R
ECOMMENDED
75W C
APACITIVE
C
OUPLING
A
PPLICATION
........................................................................................... 23
F
IGURE
12. R
ECOMMENDED
120W T
WISTED
P
AIR
C
APACITIVE
C
OUPLING
A
PPLICATION
.................................................................. 23
2.3 THE RECEIVE EQUALIZER BOCK ............................................................................................................... 24
2.4 THE PEAK DETECTOR AND SLICER BLOCK ............................................................................................. 24
2.5 THE LOS DETECTOR BLOCK ...................................................................................................................... 24
F
IGURE
13. I
LLUSTRATION
OF
THE
S
IGNAL
L
EVELS
THAT
THE
R
ECEIVER
S
ECTIONS
(
WITHIN
XRT59L921)
WILL
DECLARE
AND
CLEAR
LOS
24
F
IGURE
14. T
HE
B
EHAVIOR
OF
THE
LOS O
UTPUT
I
NDICATOR
,
IN
RESPONSE
TO
THE
L
OSS
OF
S
IGNAL
,
AND
THE
R
ESTORATION
OF
THE
S
IG
-
NAL
................................................................................................................................................................................ 25
2.6 LOS MUTE DESCRIPTION ............................................................................................................................ 25
2.7 THE RECEIVE OUTPUT INTERFACE BLOCK ............................................................................................. 25
3.0 SHUTTING OFF THE TRANSMITTER ................................................................................................25
F
IGURE
15. T
RANSMIT
T
IMING
D
IAGRAM
......................................................................................................................................... 26
F
IGURE
16. R
ECEIVE
T
IMING
D
IAGRAM
........................................................................................................................................... 26
APPLICATION INFORMATION.................................................................................................................27
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