參數(shù)資料
型號(hào)： XRT83SL314IB
廠商： Exar Corporation
文件頁(yè)數(shù)： 38/83頁(yè)
文件大?。?/td> 0K
描述： IC LIU SH T1/E1/J1 14CH 304TBGA
標(biāo)準(zhǔn)包裝： 27
類型： 線路接口裝置（LIU）
驅(qū)動(dòng)器/接收器數(shù)： 14/14
規(guī)程： T1，E1，J1
電源電壓： 3.135 V ~ 3.465 V
安裝類型： 表面貼裝
封裝/外殼： 304-LBGA
供應(yīng)商設(shè)備封裝： 304-TBGA（31x31）
包裝： 托盤
xr
XRT83SL314
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.1
40
4.6.1
T1 Short Haul Line Build Out (LBO)
The short haul transmitter output pulses are generated using a 7-Bit internal DAC (6-Bit plus the MSB sign bit).
The line build out can be set to interface to five different ranges of cable attenuation by programming the
appropriate channel register. The pulse shape is divided into eight discrete time segments which are set to
fixed values to comply with the pulse template. To program the eight segments individually to optimize a
special line build out, see the arbitrary pulse section of this datasheet. The short haul LBO settings are shown
4.6.2
Arbitrary Pulse Generator For T1 and E1
The arbitrary pulse generator divides the pulse into eight individual segments. Each segment is set by a 7-Bit
binary word by programming the appropriate channel register. This allows the system designer to set the
overshoot, amplitude, and undershoot for a unique line build out. The MSB (bit 7) is a sign-bit. If the sign-bit is
set to "0", the segment will move in a positive direction relative to a flat line (zero) condition. If this sign-bit is
set to "1", the segment will move in a negative direction relative to a flat line condition. The resolution of the
DAC is typically 60mV per LSB. Thus, writing 7-bit = 1111111 will clamp the output at either voltage rail
corresponding to a maximum amplitude. A pulse with numbered segments is shown in Figure 36.
FIGURE 36. ARBITRARY PULSE SEGMENT ASSIGNMENT
NOTE: By default, the arbitrary segments are programmed to 0x00h. The transmitter outputs will result in an all zero
pattern to the line interface.
4.7
DMO (Digital Monitor Output)
The driver monitor circuit is used to detect transmit driver failures by monitoring the activities at TTIP/TRING
outputs. Driver failure may be caused by a short circuit in the primary transformer or system problems at the
transmit inputs. If the transmitter of a channel has no output for more than 128 clock cycles, DMO goes "High"
until a valid transmit pulse is detected. If the DMO interrupt is enabled, the change in status of DMO will cause
TABLE 13: SHORT HAUL LINE BUILD OUT
LBO SETTING EQC[4:0]
RANGE OF CABLE ATTENUATION
08h (01000)
0 - 133 Feet
09h (01001)
133 - 266 Feet
0Ah (01010)
266 - 399 Feet
0Bh (01011)
399 - 533 Feet
0Ch (01100)
533 - 655 Feet
1
2
3
4
5
6
7
8
Segment
Register
1
0xn8
2
0xn9
3
0xna
4
0xnb
5
0xnc
6
0xnd
7
0xne
8
0xnf
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XRT83SL34IV 功能描述:時(shí)鐘合成器/抖動(dòng)清除器 RoHS:否 制造商:Skyworks Solutions, Inc. 輸出端數(shù)量: 輸出電平: 最大輸出頻率: 輸入電平: 最大輸入頻率:6.1 GHz 電源電壓-最大:3.3 V 電源電壓-最小:2.7 V 封裝 / 箱體:TSSOP-28 封裝:Reel
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