herunterladen
Features
•
Provides Analog Transmission Line
Interface for T1 and E1 Applications
•
Provides Line Driver, Jitter Attenuator
and Clock Recovery Functions
•
Fully Compliant with AT&T 62411
Stratum 4 Jitter Requirements
•
Low Power Consumption
(typically 175 mW)
•
B8ZS/HDB3/AMI Encoder/Decoder
•
14 dB of Transmitter Return Loss
General Description
The CS61574A and CS61575 combine the complete
analog transmit and receive line interface for T1 or E1
applications in a low power, 28-pin device operating
from a +5V supply. Both devices support processor-
based or stand-alone operation and interface with
industry standard T1 and E1 framers.
The receiver uses a digital Delay-Locked-Loop which is
continuously calibrated from a crystal reference to pro-
vide excellent stability and jitter tolerance. The
CS61574A has a receiver jitter attenuator optimized for
minimum delay in switching and transmission applica-
tions, while the CS61575 attenuator is optimized for
CPE applications subject to AT&T 62411 requirements.
The transmitter features internal pulse shaping and a
matched, constant impedance output stage to insure
signal quality on mismatched, poorly terminated lines.
Applications
• Interfacing Network Equipment such as DACS and
Channel Banks to a DSX-1 Cross Connect
• Interfacing Customer Premises Equipment to a
CSU
• Building Channel Service Units
ORDERING INFORMATION - See page 26.
MAY ’96
DS154F2
1
Crystal Semiconductor Corporation
P. O. Box 17847, Austin, Texas, 78760
(512) 445-7222 FAX:(512) 445-7581
T1/E1 Line Interface
CS61574A
CS61575
TTIP
TCLK
7
RRING
RTIP
TRING
TGND
14
CONTROL
LINE RECEIVER
LINE DRIVER
15
3
2
6
4
RCLK
8
27
LLOOP
(SCLK)
2524
(INT)
LEN0
(SDI)
LEN1
(SDO)
LEN2
28 23
(CLKE)
TAOS
5
MODE
TPOS
[TDATA]
RPOS
[RDATA]
RNEG
[BPV]
TNEG
[TCODE]
MTIP
[RCODE]
DPM
[AIS]
LOS
12 21
RV+
22
RGND
13
19
20
17
11
18
16
MRING
[PCS]
XTALIN
9
XTALOUT
10
ACLKI
1
( ) = Pin Function in
Host Mode
[ ] = Pin Function in
Extended Hardware Mode
26
RLOOP
(CS)
R
E
M
O
T
E
L
O
O
P
B
A
C
K
AMI,
B8ZS,
HDB3,
CODER
JITTER
ATTENUATOR
PULSE
SHAPER
CLOCK &
DATA
RECOVERY
SIGNAL
QUALITY
MONITOR
DRIVER
MONITOR
TV+
L
O
C
A
L
L
O
O
P
B
A
C
K
Copyright
Crystal Semiconductor Corporation 1996
(All Rights Reserved)
