参数资料
型号: IDT82V2042EPFG
厂商: IDT, Integrated Device Technology Inc
文件页数: 17/83页
文件大小: 0K
描述: IC LIU T1/J1/E1 2CH SHORT 80TQFP
标准包装: 45
类型: 线路接口装置(LIU)
规程: E1
电源电压: 3.13 V ~ 3.47 V
安装类型: 表面贴装
封装/外壳: 80-LQFP
供应商设备封装: 80-TQFP(14x14)
包装: 托盘
其它名称: 82V2042EPFG
IDT82V2042E
DUAL CHANNEL T1/E1/J1 SHORT HAUL LINE INTERFACE UNIT
FUNCTIONAL DESCRIPTION
24
December 12, 2005
3.4
RECEIVE PATH
The receive path consists of Receive Internal Termination, Monitor
Gain,Amplitude/WaveShapeDetector,DigitalTuningController,Adaptive
Equalizer,DataSlicer,CDR(Clock& Data Recovery),OptionalJitterAtten-
uator, Decoder and LOS/AIS Detector. Refer to Figure-7.
3.4.1
RECEIVE INTERNAL TERMINATION
The impedance matching can be realized by the internal impedance
matching circuit or the external impedance matching circuit. If R_TERM[2]
is set to ‘0’, the internal impedance matching circuit will be selected. In this
case, the R_TERM[1:0] bits (TERM, 02H...) can be set to choose 75
,100
, 110 or 120 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.
Figure-8 shows the appropriate external components to connect with
the cable for one channel. Table-11 is the list of the recommended imped-
ance matching for receiver.
Figure-7 Receive Path Function Block Diagram
Figure-8 Transmit/Receive Line Circuit
Table-11 Impedance Matching for Receiver
Cable Configuration
Internal Termination
External Termination
R_TERM[2:0]
RR
R_TERM[2:0]
RR
E1/75
000
120
1XX
75
E1/120
001
120
T1
010
100
J1
011
110
Monitor Gain/
Adaptive Equalizer
LOS/AIS
Detector
Data Slicer
Decoder
LOS
RCLK
RDP
RDN
RTIP
Clock
and Data
Recovery
Receive
Internal
termination
RRING
Jitter
Attenuator
Note:
1. Common decoupling capacitor. One per chip
2. Cp 0-560 (pF)
3. D1 - D8, Motorola - MBR0540T1; International Rectifier - 11DQ04 or 10BQ060
4. RT/ RR: refer toTable-10 and Table-11 respecivley for RT and RR values
A
B
RX Line
RR4
TX Line
RT4
RTIPn
RRINGn
TRINGn
TTIPn
0.1
F
GNDTn
VDDTn
IDT
82V2
042E
VDDTn
D4
D3
D2
D1
1:1
2:1
68
F1
D6
D5
D8
D7
Cp
VDDRn
One of the Two Identical Channels
2
3
3.3 V
0.1
F
GNDRn
VDDRn
68
F
3.3 V
1
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