XRT83SH314ES Exar, XRT83SH314ES Datasheet - Page 21

• Manufacturer Part Number: XRT83SH314ES
• Description: Peripheral Drivers & Components - PCIs 14 CHT1/E1LIU SH
• Manufacturer: Exar

Specifications of XRT83SH314ES

• Product Category: Peripheral Drivers & Components - PCIs
• Rohs: yes

REV. 1.0.4
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
By default, RxRES[1:0] is set to "None" for no external fixed resistor. If an external fixed resistor is used, the
XRT83SH314 uses the parallel combination of the external fixed resistor and the internal termination as the
input impedance. See
N
F
2.1.2
OTE
IGURE
: Without the external resistor, the XRT83SH314 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
Internal Impedance
XRT83SH314 LIU
C
ONNECTION
T
Figure 5
ABLE
3: S
Receiver
D
for a typical connection diagram using the external fixed resistor.
ELECTING THE
R
Input
IAGRAM
X
0h (00)
1h (01)
2h (10)
3h (11)
RES[1:0]
R
R
U
RING
TIP
SING
14-CHANNEL T1/E1/J1 SHORT-HAUL LINE INTERFACE UNIT
V
ALUE OF THE
O
NE
R=240Ω, 210Ω, or 150Ω
E
17
XTERNAL
R
E
Table
XTERNAL
E
XTERNAL
F
IXED
1:1
3.
None
240Ω
210Ω
150Ω
F
IXED
R
F
ESISTOR
IXED
R
Line Interface T1/E1/J1
ESISTOR
R
ESISTOR
XRT83SH314