參數(shù)資料
型號： IDT82P2828BHG
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 88/154頁
文件大?。?/td> 0K
描述： IC LIU T1/J1/E1 28+1CH 640-PBGA
標準包裝： 5
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： 640-BGA 裸露焊盤
供應(yīng)商設(shè)備封裝： 640-PBGA-EP（31x31）
包裝： 托盤
其它名稱： 82P2828BHG
IDT82P2828
28(+1) CHANNEL HIGH-DENSITY T1/E1/J1 LINE INTERFACE UNIT
Functional Description
39
February 6, 2009
3.3.5
LINE DRIVER
The Line Driver can be set to High-Z for protection or in redundant
applications.
The following two ways will set the Line Driver to High-Z:
Setting the OE pin to low will globally set all the Line Drivers to
High-Z;
Setting the OE bit (b6, TCF0,...) to ‘0’ will set the corresponding
Line Driver to High-Z.
By these ways, the functionality of the internal circuit is not affected
and TTIPn and TRINGn will enter High-Z state immediately.
3.3.5.1 Transmit Over Current Protection
The Line Driver monitors the Transmit Over Current (TOC) on the
line interface. When TOC is detected, the driver’s output (i.e., output on
TTIPn/TRINGn) is determined by the THZ_OC bit (b4, TCF0,...). If the
THZ_OC bit (b4, TCF0,...) is ‘0’, the driver’s output current (peak to
peak) is limited to 100 mA; if the THZ_OC bit (b4, TCF0,...) is ‘1’, the
driver’s output will enter High-Z. TOC is indicated by the TOC_S bit (b4,
STAT0,...). A transition from ‘0’ to ‘1’ on the TOC_S bit (b4, STAT0,...) or
any transition (from ‘0’ to ‘1’ or from ‘1’ to ‘0’) on the TOC_S bit (b4,
STAT0,...) will set the TOC_IS bit (b4, INTS0,...) to ‘1’, as selected by the
TOC_IES bit (b4, INTES,...). When the TOC_IS bit (b4, INTS0,...) is ‘1’,
an interrupt will be reported by INT if not masked by the TOC_IM bit (b4,
TOC may be indicated by the TMFn pin. Refer to Section 3.5.7.2
TMFn Indication for details.
3.3.6
TX TERMINATION
The transmit line interface supports Transmit Differential mode and
Transmit Single Ended mode, as selected by the T_SING bit (b3,
TCF0,...). In Transmit Differential mode, both TTIPn and TRINGn are
used to transmit signals to the line side. In Transmit Single Ended mode,
only TTIPn is used to transmit signal.
The line interface can be connected with T1 100
, J1 110 or E1
120
twisted pair cable or E1 75 coaxial cable.
The transmit impedance matching is realized by using internal
impedance matching or external impedance matching for each channel
in different applications.
3.3.6.1 Transmit Differential Mode
In Transmit Differential mode, different applications have different
impedance matching. For T1/J1 applications, only Internal Impedance
Matching is supported. For E1 applications, both Internal and External
Impedance Matching are supported.
Internal Impedance Matching circuit uses an internal programmable
resistor (IM) only.
External Impedance Matching circuit uses an external resistor (Rt)
only.
A twisted pair cable can be connected with a 1:2 (step up) trans-
former or without a transformer (transformer-less), while a coaxial cable
must be connected with a 1:2 transformer.
The T_TERM[2:0] bits (b2~0, TCF0,...) should be set according to
different cable conditions, whether a transformer is used, and what kind
of Impedance Matching is selected.
Table-15 lists the recommended impedance matching value in
different applications. Figure-19 to Figure-21 show the connection for
one channel in different applications.
The transformer-less connection will offer a termination option with
reduced cost and board space. However, the waveform amplitude is not
standard compliant, and surge protection and common mode depres-
sion should be enhanced depending on equipment environment..
Table-15 Impedance Matching Value in Transmit Differential Mode
Cable Condition
Internal Impedance Matching
External Impedance Matching
T_TERM[2:0]
Rt
T_TERM[2:0]
Rt
T1 100
twisted pair (with transformer)
000
0
(not supported)
J1 110
twisted pair (with transformer)
001
E1 120
twisted pair (with transformer), PULS[3:0]=0001
010
111
10
E1 75
coaxial (with transformer), PULS[3:0]=0000
011
T1 100
twisted pair (transformer-less)
100
(not supported)
J1 110
twisted pair (transformer-less)
101
E1 120
twisted pair (transformer-less), PULS[3:0]=0001
110
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