參數(shù)資料
型號： IDT82P2828BHG
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 79/154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
供應商設備封裝： 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
30
February 6, 2009
When RIM is low, only External Impedance Matching is supported for
all 29 receivers and the per-channel impedance matching configuration
bits - the R_TERM[2:0] bits (b2~0, RCF0,...) and the R120IN bit (b4,
RCF0,...) - are ignored.
When RIM is high, impedance matching is configured on a per-
channel basis. Three kinds of impedance matching are all supported
and selected by the R_TERM[2:0] bits (b2~0, RCF0,...) and the R120IN
bit (b4, RCF0,...). The R_TERM[2] bit (b2, RCF0,...) should be set to
match internal or external impedance. If the R_TERM[2] bit (b2,
RCF0,...) is ‘0’, internal impedance matching is enabled. The R120IN bit
(b4, RCF0,...) should be set to select Partially Internal Impedance
Matching or Fully Internal Impedance Matching. The internal program-
mable resistor (IM) is determined by the R_TERM[1:0] bits (b1~0,
RCF0,...). If the R_TERM[2] bit (b2, RCF0,...) is ‘1’, external impedance
matching is enabled. The configuration of the R120IN bit (b4, RCF0,...)
and the R_TERM[1:0] bits (b1~0, RCF0,...) is ignored.
A twisted pair cable can be connected with a 1:1 transformer or
without a transformer (transformer-less), while a coaxial cable must be
connected with a 1:1 transformer. Table 2 lists the recommended imped-
ance matching value in different applications. Figure-8 to Figure-10
show the connection for one channel.
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.
Figure-8 Receive Differential Line Interface with Twist-
ed Pair Cable (with transformer)
Figure-9 Receive Differential Line Interface with Coax-
ial Cable (with transformer)
Table-2 Impedance Matching Value in Receive Differential Mode
Cable Condition
Partially Internal Impedance Matching
(R120IN = 0) 1
Fully Internal Impedance Matching
(R120IN = 1) 1, 2
External Impedance Matching
R_TERM[2:0]
Rr
R_TERM[2:0]
Rr
R_TERM[2:0] 3
Rr
T1 100
twisted pair (with transformer)
000
120
000
(open)
1XX
100
J1 110
twisted pair (with transformer)
001
110
E1 120
twisted pair (with transformer)
010
120
E1 75
coaxial (with transformer)
011
75
T1 100
twisted pair (transformer-less4)
000
(not supported)
100
J1 110
twisted pair (transformer-less)
001
110
E1 120
twisted pair (transformer-less)
010
120
Note:
1. Partially Internal Impedance Matching and Fully Internal Impedance Matching are not supported when RIM is low.
2. Fully Internal Impedance Matching is not supported in transformer-less applications.
3. When RIM is low, the setting of the R_TERM[2:0] bits is ignored.
4. In transformer-less applications, the device should be protected against overvoltage. There are three important standards for overvoltage protection:
UL1950 and FCC Part 68;
Telcordia (Bellcore) GR-1089
ITU-T K.20, K.21 and K.41
1:1
Rr
RTIPn
RRINGn
IM
6.0 Vpp
1:1
Rr
RTIPn
RRINGn
IM
4.74 Vpp
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