Figure-4 E1 Pulse Template Test Circuit For T" />
參數(shù)資料
型號： IDT82V2081PPG
廠商： IDT, Integrated Device Technology Inc
文件頁數(shù)： 8/68頁
文件大?。?/td> 0K
描述： IC LIU T1/J1/E1 1CH 44-TQFP
標準包裝： 80
類型： 線路接口裝置（LIU）
規(guī)程： T1/E1/J1
電源電壓： 3.13 V ~ 3.47 V
安裝類型： 表面貼裝
封裝/外殼： 44-LQFP
供應商設備封裝： 44-TQFP（10x10）
包裝： 托盤
其它名稱： 800-2347
82V2081PPG
IDT82V2081PPG-ND
16
INDUSTRIAL
TEMPERATURE RANGES
SINGLE CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
Figure-4 E1 Pulse Template Test Circuit
For T1 applications, the pulse shape is shown in Figure-5 according to
the T1.102 and the measuring diagram is shown in Figure-6. This also
meets the requirement of G.703, 2001. The cable length is divided into five
grades,andtherearefivepulsetemplatesusedforeachofthecablelength.
The pulse template is selected by PULS[3:0] bits (TCF1, 06H).
Figure-5 DSX-1 Waveform Template
Figure-6 T1 Pulse Template Test Circuit
For J1 applications, the PULS[3:0] (TCF1, 06H) should be set to ‘0111’.
Table-14 lists these values.
3.3.3.2 LBO (Line Build Out)
To prevent the cross-talk at the far end, the output of TTIP/TRING could
be attenuated before transmission for long haul applications. The FCC Part
68 Regulations specifies four grades of attenuation with a step of 7.5 dB.
Three LBOs are used to implement the pulse attenuation. The PULS[3:0]
bits (TCF1, 06H) are used to select the attenuation grade. Both Table-14
and Table-15 list these values.
3.3.3.3 User-Programmable Arbitrary Waveform
When the PULS[3:0] bits are set to ‘11xx’, user-programmable arbitrary
waveform generator mode can be used. This allows the transmitter perfor-
mance to be tuned for a wide variety of line condition or special application.
Each pulse shape can extend up to 4 UIs (Unit Interval), addressed by
UI[1:0] bits (TCF3, 08H) and each UI is divided into 16 sub-phases,
addressedbytheSAMP[3:0]bits(TCF3,08H).Thepulseamplitudeofeach
phase is represented by a binary byte, within the range from +63 to -63,
stored in WDAT[6:0] bits (TCF4, 09H) in signed magnitude form. The most
positive number +63 (D) represents the positive maximum amplitude of the
transmit pulse while the most negative number -63 (D) represents the max-
imum negative amplitude of the transmit pulse. Therefore, up to 64 bytes
are used.
There are twelve standard templates which are stored in an on-chip ROM.
User can select one of them as reference and make some changes to get
the desired waveform.
User can change the wave shape and the amplitude to get the desired
pulse shape. In order to do this, firstly, users can choose a set of waveform
value from the following twelve tables, which is the most similar to the
data and scaling data of each of the twelve templates. Then modify the cor-
responding sample data to get the desired transmit pulse shape.
Secondly, through the value of SCAL[5:0] bits increased or decreased
by 1, the pulse amplitude can be scaled up or down at the percentage ratio
against the standard pulse amplitude if needed. For different pulse shapes,
the value of SCAL[5:0] bits and the scaling percentage ratio are different.
The following twelve tables list these values.
Do the followings step by step, the desired waveform can be pro-
grammed, based on the selected waveform template:
(1).Select the UI by UI[1:0] bits (TCF3, 08H)
(2).Specify the sample address in the selected UI by SAMP [3:0] bits
(TCF3, 08H)
(3).Write sample data to WDAT[6:0] bits (TCF4, 09H). It contains the
data to be stored in the RAM, addressed by the selected UI and the
corresponding sample address.
(4).Set the RW bit (TCF3, 08H) to ‘0’ to implement writing data to RAM,
or to ‘1’ to implement read data from RAM
(5).Implement the Read from RAM/Write to RAM by setting the DONE
bit (TCF3, 08H)
Repeat the above steps until all the sample data are written to or read
from the internal RAM.
(6).Write the scaling data to SCAL[5:0] bits (TCF2, 07H) to scale the
amplitude of the waveform based on the selected standard pulse
amplitude
WhenmorethanoneUIisusedtocomposethepulsetemplate,theover-
lap of two consecutive pulses could make the pulse amplitude overflow
(exceed the maximum limitation) if the pulse amplitude is not set properly.
This overflow is captured by DAC_OV_IS bit (INTS1, 1AH), and, if enabled
by the DAC_OV_IM bit (INTM1, 15H), an interrupt will be generated.
The following tables give all the sample data based on the preset pulse
templates and LBOs in detail for reference. For preset pulse templates and
LBOs, scaling up/down against the pulse amplitude is not supported.
IDT82V2081
VOUT
RLOAD
TTIP
TRING
Note: 1. For RLOAD = 75
(nom), Vout (Peak)=2.37V (nom)
2. For RLOAD =120
(nom), Vout (Peak)=3.00V (nom)
-0.6
-0.4
-0.2
0
0.2
0.4
0.6
0.8
1
1.2
0
250
500
750
1000
1250
Time (ns)
Normalized
Amplit
ude
IDT82V2081
TTIP
TRING
Cable
RLOAD VOUT
Note: RLOAD = 100
± 5%
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相關代理商/技術參數(shù)
參數(shù)描述
IDT82V2081PPG8 功能描述:IC LIU T1/J1/E1 1CH 44-TQFP RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:250 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR)
IDT82V2082 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:DUAL CHANNEL T1/E1/J1 LONG HAUL/ SHORT HAUL LINE INTERFACE UNIT
IDT82V2082_09 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:DUAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
IDT82V2082BFBLANK 制造商:IDT 制造商全稱:Integrated Device Technology 功能描述:DUAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
IDT82V2082BFG 功能描述:IC LIU T1/E1/J1 2CH 81BGA RoHS:是 類別:集成電路 (IC) >> 接口 - 驅動器，接收器，收發(fā)器 系列:- 標準包裝:250 系列:- 類型:收發(fā)器 驅動器/接收器數(shù):2/2 規(guī)程:RS232 電源電壓:3 V ~ 5.5 V 安裝類型:表面貼裝 封裝/外殼:16-TSSOP（0.173"，4.40mm 寬） 供應商設備封裝:16-TSSOP 包裝:帶卷 (TR)
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