IDT82V2088 Integrated Device Technology, IDT82V2088 Datasheet - Page 22

• Manufacturer Part Number: IDT82V2088
• Description: Octal Channel T1/e1/j1 Long Haul/ Short Haul Line Interface Unit
• Manufacturer: Integrated Device Technology

OCTAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
3.3
Gain, Amplitude/Wave Shape Detector, Digital Tuning Controller, Adaptive
Equalizer, Data Slicer, CDR (Clock and Data Recovery), Optional Jitter
Attenuator, Decoder and LOS/AIS Detector. Refer to Figure-8.
3.3.1
matching circuit or the external impedance matching circuit. If R_TERM[2]
Table-15 Impedance Matching for Receiver
RTIP
RRING
The receive path consists of Receive Internal Termination, Monitor
The impedance matching can be realized by the internal impedance
Cable Configuration
RECEIVE PATH
RECEIVE INTERNAL TERMINATION
E1/120 Ω
E1/75 Ω
T1
J1
termination
Receive
Internal
Note: 1. Common decoupling capacitor
R
2. Cp 0-560 (pF)
3. D1 - D8, Motorola - MBR0540T1;
Monitor Gain
X
T
Line
X
Line
A
B
R_TERM[2:0]
•
•
Figure-8 Receive Path Function Block Diagram
1:1
2:1
000
001
010
011
Internal Termination
•
•
Figure-9 Transmit/Receive Line Circuit
Cp
Equalizer
Adaptive
2
R
R
•
•
R
R
VDDRn
T
T
D6
D5
•
·
International Rectifier - 11DQ04 or 10BQ060
VDDTn
VDDTn
VDDRn
D2
D1
D8
D7
D4
D3
Data Slicer
3
120 Ω
R
•
•
•
·
·
·
22
R
One of the Eight Identical Channels
RTIPn
RRINGn
TTIPn
TRINGn
is set to ‘0’, the internal impedance matching circuit will be selected. In this
case, the R_TERM[1:0] bits (TERM, 1AH...) can be set to choose 75 Ω, 100
Ω, 110 Ω or 120 Ω internal impedance of RTIPn/RRINGn. If R_TERM[2]
is set to ‘1’, the internal impedance matching circuit will be disabled. In this
case, the external impedance matching circuit will be used to realize the
impedance matching.
the cable for one channel.
ance matching for receiver.
Figure-9
Recovery
and Data
Clock
shows the appropriate external components to connect with
R_TERM[2:0]
GNDRn
VDDRn
GNDTn
VDDTn
1XX
Attenuator
Table-15
Jitter
External Termination
0.1µF
0.1µF
is the list of the recommended imped-
•
•
TEMPERATURE RANGES
LOS/AIS
Detector
Decoder
68µF
68µF
3.3 V
1
3.3 V
1
120 Ω
100 Ω
110 Ω
75 Ω
R
R
INDUSTRIAL
LOS
RCLK
RDN
RDP