XRT83L314ES Exar, XRT83L314ES Datasheet - Page 34

• Manufacturer Part Number: XRT83L314ES
• Description: LIN Transceivers
• Manufacturer: Exar

Specifications of XRT83L314ES

• Product Category: LIN Transceivers
• Rohs: yes

XRT83L314
14-CHANNEL T1/E1/J1 LONG-HAUL/SHORT-HAUL LINE INTERFACE UNIT
REV. 1.0.0
The XRT83L314 can transmit a QRSS random sequence to a remote location from TTIP/TRING. The
polynomial is shown in Table 11.
If TCLK is not present, pulled "Low", or pulled "High" the transmitter outputs at TTIP/TRING will automatically
send an all ones or an all zero signal to the line by programming the appropriate global register. By default, the
transmitters will send all zeros. To send all ones, the TCLKCNL bit must be set "High".
The long haul transmitter output pulses are generated using a 7-Bit internal DAC (6-Bits plus the MSB sign bit).
The line build out can be set to -7.5dB, -15dB, or -22dB cable attenuation by programming the appropriate
channel register. The long haul LBO consist of 32 discrete time segments extending over four consecutive
periods of TCLK. As the LBO attenuation is increased, the pulse amplitude is reduced so that the waveform
complies with ANSI T1.403 specifications. A long haul pulse with -7.5dB attenuation is shown in Figure 26, a
pulse with -15dB attenuation is shown in Figure 27, and a pulse with -22.5dB attenuation is shown in
Figure 28.
F
3.6
3.5.4
3.6.1
IGURE
26. L
Transmit Pulse Shaper and Filter
QRSS Generation
T1 Long Haul Line Build Out (LBO)
ONG
H
AUL
L
R
INE
ANDOM
B
QRSS
T
UILD
ABLE
P
ATTERN
O
UT WITH
11: R
ANDOM
-7.5
D
B
B A
2
IT
20
T1
30
S
TTENUATION
- 1
EQUENCE
P
OLYNOMIALS
2
15
E1
- 1