參數(shù)資料
型號： IDT82V2044EPFG
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 10/73頁
文件大小： 0K
描述： IC LIU T1/E1 QUAD SHORT 128-TQFP
標準包裝： 15
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： 128-LQFP
供應(yīng)商設(shè)備封裝： 128-TQFP（14x20）
包裝： 托盤
其它名稱： 82V2044EPFG
18
INDUSTRIAL
TEMPERATURE RANGES
QUAD CHANNEL T1/E1/J1 SHORT HAUL LINE INTERFACE UNIT
3.2.4
TRANSMIT PATH LINE INTERFACE
The transmit line interface consists of TTIPn pin and TRINGn pin. The
impedance matching can be realized by the internal impedance matching
circuit or the external impedance matching circuit. If T_TERM[2] is set to
‘0’, the internal impedance matching circuit will be selected. In this case,
the T_TERM[1:0] bits (TERM, 1AH...) can be set to choose 75
, 100 ,
110
or 120 internal impedance of TTIPn/TRINGn. If T_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 imped-
ance matching. For T1/J1 mode, the external impedance matching circuit
forthetransmitterisnotsupported.Figure-8showstheappropriateexternal
components to connect with the cable for one channel. Table-10 is the list
of the recommended impedance matching for transmitter.
The TTIPn/TRINGn can be turned into high impedance globally by pull-
ing THZ pin to high or individually by setting the THZ bit (TCF1, 03H...) to
‘1’. In this state, the internal transmit circuits are still active.
Besides, in the following cases, TTIPn/TRINGn will also become high
impedance:
Loss of MCLK: all TTIPn/TRINGn pins become high impedance;
Loss of TCLKn: corresponding TTIPn/TRINGn become HZ (excep-
tions: Remote Loopback; Transmit internal pattern by MCLK);
Transmit path power down;
After software reset; pin reset and power on.
Note: The precision of the resistors should be better than ± 1%
3.2.5
TRANSMIT PATH POWER DOWN
The transmit path can be powered down individually by setting the
T_OFF bit (TCF0, 02H...) to ‘1’. In this case, the TTIPn/TRINGn pins are
turned into high impedance.
Table-10 Impedance Matching for Transmitter
Cable Configuration
Internal Termination
External Termination
T_TERM[2:0]
PULS[3:0]
RT
T_TERM[2:0]
PULS[3:0]
RT
E1/75
000
0000
0
1XX
0001
9.4
E1/120
001
0001
T1/0~133 ft
010
0010
--
-
T1/133~266 ft
0011
T1/266~399 ft
0100
T1/399~533 ft
0101
T1/533~655 ft
0110
J1/0~655 ft
011
0111
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