參數(shù)資料
型號: IDT82V2051EPPG8
廠商: IDT, Integrated Device Technology Inc
文件頁數(shù): 10/61頁
文件大小: 0K
描述: IC LIU E1 SGL SHORT HAUL 44-TQFP
標(biāo)準(zhǔn)包裝: 1,250
類型: 線路接口裝置(LIU)
規(guī)程: E1
電源電壓: 3.13 V ~ 3.47 V
安裝類型: 表面貼裝
封裝/外殼: 44-LQFP
供應(yīng)商設(shè)備封裝: 44-TQFP(10x10)
包裝: 帶卷 (TR)
其它名稱: 82V2051EPPG8
IDT82V2051E
SINGLE CHANNEL E1 SHORT HAUL LINE INTERFACE UNIT
Functional Description
18
December 9, 2005
3.3
RECEIVE PATH
The receive path consists of Receive Internal Termination, Monitor
Gain,Amplitude/WaveShapeDetector,DigitalTuningController,Adaptive
Equalizer, Data Slicer, CDR (Clock & Data Recovery), Optional Jitter
Attenuator, Decoder and LOS/AIS Detector. Refer to Figure-5.
3.3.1
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, 03H) can be set to choose 75
or 120
internal impedance of RTIP/RRING. If R_TERM[2] is set to ‘1’, the inter-
nal impedance matching circuit will be disabled. In this case, the external
impedancematchingcircuitwillbeusedtorealizetheimpedancematching.
Figure-6 shows the appropriate external components to connect with the
cable. Table-5 is the list of the recommended impedance matching for
receiver.
Figure-5 Receive Monitor Gain Adaptive Equalizer
Figure-6 Transmit/Receive Line Circuit
Table-5 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
Adaptive Equalizer/
Monitor Gain
LOS/AIS
Detector
Data Slicer
Decoder
LOS
RCLK
RDP
RDN
RTIP
Clock
and Data
Recovery
Receive
Internal
termination
RRING
Jitter
Attenuator
A
B
RX Line
RR
TX Line
RT
RTIP
RRING
TRING
TTIP
IDT
82V2051E
VDDT
D4
D3
D2
D1
1:1
2:1
D6
D5
D8
D7
Cp
VDDA
0.1
F
GNDT
VDDT
68
F1
3.3 V
0.1
F
GNDA
VDDA
68
F
3.3 V
1
4
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-4 and Table-5 respecivley for RT and RR values
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