XRT83L314ES Exar, XRT83L314ES Datasheet - Page 20

• 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
Along with the internal termination, a high precision external fixed resistor can be used to optimize the return
loss. This external resistor can be used for all modes of operation ensuring one bill of materials. There are
three resistor values that can be used by setting the RxRES[1:0] bits in the appropriate channel register.
Selecting the value for the external fixed resistor is shown in Table 3.
By default, RxRES[1:0] is set to "None" for no external fixed resistor. If an external fixed resistor is used, the
XRT83L314 uses the parallel combination of the external fixed resistor and the internal termination as the input
impedance. See Figure 5 for a typical connection diagram using the external fixed resistor.
N
F
2.1.2
OTE
IGURE
: Without the external resistor, the XRT83L314 meets all return loss specifications. This mode was created to add
flexibility for optimizing return loss by using a high precision external resistor.
5. T
CASE 2: Internal Termination With One External Fixed Resistor for All Modes
YPICAL
C
ONNECTION
T
ABLE
Internal Impedance
XRT83L314 LIU
3: S
D
ELECTING THE
R
IAGRAM
X
0h (00)
1h (01)
2h (10)
3h (11)
RES[1:0]
Receiver
Input
U
SING
R
R
RING
TIP
V
ALUE OF THE
O
NE
R=240 , 210 , or 150
E
16
XTERNAL
R
E
XTERNAL
E
XTERNAL
1:1
F
IXED
None
240
210
150
F
Line Interface T1/E1/J1
IXED
R
F
ESISTOR
IXED
R
ESISTOR
R
ESISTOR