參數(shù)資料
型號(hào)： IDT82P20516DBFG
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 29/115頁
文件大?。?/td> 0K
描述： IC LIU T1/E1/J1 16CH SH 484BGA
標(biāo)準(zhǔn)包裝： 84
功能： 線路接口單元（LIU）
接口： E1，J1，T1
電路數(shù)： 16
電源電壓： 1.8V, 3.3V
功率（瓦特）： 2.89W
工作溫度： -40°C ~ 85°C
安裝類型： 表面貼裝
封裝/外殼： 484-LFBGA
供應(yīng)商設(shè)備封裝： 484-CABGA（19x19）
包裝： 托盤
包括： AIS 警報(bào)檢測器和發(fā)生器，回送功能，PRBS 發(fā)生器 / 檢測器，遠(yuǎn)程檢測器和發(fā)生器
IDT82P20516
16-CHANNEL SHORT HAUL E1 LINE INTERFACE UNIT
Functional Description
20
December 17, 2009
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-4 to Figure-6 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-4 Receive Differential Line Interface with Twist-
ed Pair Cable (with transformer)
Figure-5 Receive Differential Line Interface with Coax-
ial Cable (with transformer)
Figure-6 Receive Differential Line Interface with Twist-
ed Pair Cable (transformer-less, non standard compli-
ant)
3.2.2
EQUALIZER
The equalizer compensates high frequency attenuation to enhance
receive sensitivity.
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
E1 120
twisted pair (with transformer)
010
120
010
(open)
1XX
120
E1 75
coaxial (with transformer)
011
75
E1 120
twisted pair (transformer-less)
010
(not supported)
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.
1:1
Rr
RTIPn
RRINGn
IM
6.0 Vpp
1:1
Rr
RTIPn
RRINGn
IM
4.74 Vpp
IM
6.0Vpp
RTIPn
RRINGn
Rr/2
VCOM1
10 F
1. Two Rr/2 resistors should be connected to VCOM[1:0] that are
coupled to ground via a 10
F capacitor, which provide 60
common mode input resistance.
2. In this mode, lightning protection should be enhanced.
3. The maximum input dynamic range of RTIP/TRING pin is
-0.3 V ~3.6 V (in line monitor mode it is -0.3 V ~ 2 V)
Note:
VCOM0
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參數(shù)描述
IDT82P20516DBFG8 制造商:Integrated Device Technology Inc 功能描述:IC LIU T1/E1/J1 16CH SH 484BGA
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