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| 型号： | IDT82V2088BB |
| 厂商： | IDT, Integrated Device Technology Inc |
| 文件页数： | 9/78页 |
| 文件大小： | 0K |
| 描述： | IC LIU T1/J1/E1 8CH 208-BGA |
| 标准包装： | 10 |
| 类型： | 线路接口装置（LIU） |
| 规程： | E1 |
| 电源电压： | 3.13 V ~ 3.47 V |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 208-BGA |
| 供应商设备封装： | 208-PBGA（17x17） |
| 包装： | 托盘 |
| 其它名称： | 82V2088BB |
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17
INDUSTRIAL
TEMPERATURE RANGES
OCTAL CHANNEL T1/E1/J1 LONG HAUL/SHORT HAUL LINE INTERFACE UNIT
Figure-7 T1 Pulse Template Test Circuit
For J1 applications, the PULS[3:0] (TCF1, 03H...) should be set to
‘0111’. Table-14 lists these values.
3.2.3.2 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, 03H...) are used to select the attenuation grade. Both Table-14
and Table-15 list these values.
3.2.3.3 User-Programmable Arbitrary Waveform
When the PULS[3:0] bits are set to ‘11xx’, user-programmable arbitrary
waveform generator mode can be used in the corresponding channel. This
allows the transmitter performance to be tuned for a wide variety of line con-
dition or special application.
Each pulse shape can extend up to 4 UIs (Unit Interval), addressed by
UI[1:0] bits (TCF3, 05H...) and each UI is divided into 16 sub-phases,
addressed by the SAMP[3:0] bits (TCF3, 05H...). The pulse amplitude of
each phase is represented by a binary byte, within the range from +63 to -
63, stored in WDAT[6:0] bits (TCF4, 06H...) in signed magnitude form. The
most positive number +63 (D) represents the maximum positive amplitude
of the transmit pulse while the mostnegative number -63 (D) represents the
maximum negative amplitude of the transmit pulse. Therefore, up to 64
bytes are used. For each channel, a 64 bytes RAM is available.
There are twelve standard templates which are stored in a local 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
desired pulse shape. Table-2, Table-3, Table-4, Table-5, Table-6, Table-7,
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, 05H...)
(2).Specify the sample address in the selected UI by SAMP [3:0] bits
(TCF3, 05H...)
(3).Write sample data to WDAT[6:0] bits (TCF4, 06H...). It contains the
data to be stored in the RAM, addressed by the selected UI and the
corresponding sample address.
(4).SettheRWbit(TCF3,05H...)to‘0’toimplementwritingdatatoRAM,
or to ‘1’ to implement read data from RAM
(5).Implement the Read from RAM/Write to RAM by setting the DONE
bit (TCF3, 05H...)
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, 04H...) 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, 17H...), and, if
enabled by the DAC_OV_IM bit (INTM1, 12H...), an interrupt will be gen-
erated.
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.
1.Table-2 Transmit Waveform Value For E1 75
2.Table-3 Transmit Waveform Value For E1 120
3.Table-4 Transmit Waveform Value For T1 0~133 ft
4.Table-5 Transmit Waveform Value For T1 133~266 ft
5.Table-6 Transmit Waveform Value For T1 266~399 ft
6.Table-7 Transmit Waveform Value For T1 399~533 ft
7.Table-8 Transmit Waveform Value For T1 533~655 ft
8.Table-9 Transmit Waveform Value For J1 0~655 ft
9.Table-10 Transmit Waveform Value For DS1 0 dB LBO
10.Table-11 Transmit Waveform Value For DS1 -7.5 dB LBO
11.Table-12 Transmit Waveform Value For DS1 -15.0 dB LBO
12.Table-13 Transmit Waveform Value For DS1 -22.5 dB LBO
IDT82V2088
TTIPn
TRINGn
Cable
RLOAD VOUT
Note: RLOAD = 100
± 5%
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| IDT82V2088BBG | 功能描述:IC LINE INTERFACE UNIT 208-PBGA RoHS:是 类别:集成电路 (IC) >> 接口 - 驱动器，接收器，收发器 系列:- 标准包装:250 系列:- 类型:收发器 驱动器/接收器数:2/2 规程:RS232 电源电压:3 V ~ 5.5 V 安装类型:表面贴装 封装/外壳:16-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:16-TSSOP 包装:带卷 (TR) |
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| IDT82V2108 | 制造商:IDT 制造商全称:Integrated Device Technology 功能描述:T1 / E1 / J1 OCTAL FRAMER |
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