...the analog plus company
TM
XR-T3590ES
Rev. 1.00
E
1996
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538
z
(510) 668-7000
z
FAX (510) 668-7017
November 1996-2
XR-T3590
Evaluation System
User Manual
XR-T3590ES
Rev. 1.00
2
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to im-
prove design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits de-
scribed herein, conveys no license under any patent or other right, and makes no representation that the circuits are
free of patent infringement. Charts and schedules contained herein are only for illustration purposes and may vary
depending upon a user's specific application. While the information in this publication has been carefully checked;
no responsibility, however, is assumed for inaccuracies.
EXAR Corporation does not recommend the use of any of its products in life support applications where the failure or
malfunction of the product can reasonably be expected to cause failure of the life support system or to significantly
affect its safety or effectiveness. Products are not authorized for use in such applications unless EXAR Corporation
receives, in writing, assurances to its satisfaction that: (a) the risk of injury or damage has been minimized; (b) the
user assumes all such risks; (c) potential liability of EXAR Corporation is adequately protected under the circum-
stances.
Copyright 1996 EXAR Corporation
User Manual November 1996
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
Table of Contents
Rev. 1.00
3
OVERVIEW
5
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POWER REQUIREMENTS
5
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DIGITAL INPUT DIGITAL OUTPUT CONNECTIONS
5
. . . . . . . . . . . . . . . . . . . . . . . .
TRANSMITTER LINE OUTPUT AND RECEIVER LINE
INPUT CONNECTIONS
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
TRANSMITTER AND RECEIVER FUNCTION
SELECTION
5
. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1. XR-T3590 Function Selection
5
. . . . . . . . . . . . . . . . . . . . . . . . . .
XR-T3590 GROUND POTENTIAL OFFSET TESTING
6
. . . . . . . . . . . . . . . . . . . . . . .
ADDENDUM
6
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Table 2. List of Components
6
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Figure 1. Component Layout
7
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Figure 2. Circuit Diagram
8
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XR-T3590ES
Rev. 1.00
4
This Page Intentionally Left Blank
XR-T3590ES
...the analog plus company
TM
XR-T3590
Evaluation System
Rev. 1.00
5
August 1996-4
OVERVIEW
This unit is a 4.5 by 5.0 inch circuit board that simplifies the
evaluation of the XR-T3590 Single Chip V.35 Transceiver
in a CCITT V.35 application. Its features include dip
switch selection of all chip options, and provisions for
applying the ground potential offset voltage specified by
the V.35 test procedure to the receiver inputs.
Figure 1.,
Figure 2. and Table 2. show the demo board component
layout, circuit diagram, and list of components
respectively.
POWER REQUIREMENTS
Supply voltages of +5.0 Volts
5%V for V
DD
and -5.0
Volts
5% for V
SS
are applied to the board through
banana jacks. Both power sources should be
well-regulated, and each be capable of supplying 250 mA
minimum. During normal operation jumper E-1 must be
installed, and nothing is connected to the banana jack
labeled OFFSET.
DIGITAL INPUT DIGITAL OUTPUT CONNECTIONS
The TTL compatible transmitter inputs are the BNC
connectors mounted on the left side of the board that are
labeled TX1IN, TX2IN and TX3IN. Provisions are
included for installing input termination resistors R1, R2,
and R3 if required. These resistors (50 or 75
) are
needed only if a pulse generator with a low impedance
output and a fast rise time is used as a test signal source.
They are not required for TTL signals applied to the board
through short cables.
Likewise, the TTL compatible receiver outputs are the
BNC connectors labeled RX1OUT, RX2OUT, and
RX3OUT.
TRANSMITTER LINE OUTPUT AND RECEIVER LINE
INPUT CONNECTIONS
The line connections are made to the six RJ-11
connectors or to the corresponding test point pairs that
are located on the right side of the board. The RJ-11s are
for connecting twisted pair cables, and the test points
provide a convenient means for viewing the output and
input signals differentially on an oscilloscope. From top to
bottom, the three transmitter outputs are labeled
TX1OUT, TX2OUT, and TX3OUT, and the three receiver
inputs are labeled RX1IN, RX2IN, and RX3IN. Note that
connectors are wired so that the "A" and "B" XR-T3588
output pins and the "A" and "B" XR-T3589 input pins go to
the same pin numbers on the RJ-11 connectors.
Therefore, a test cable must be wired in the same manner
to prevent a data inversion between the transmitter digital
input and the receiver digital output. (Telephone cables
typically contain a "twist" between modular connectors,
and will therefore give a data inversion.)
TRANSMITTER AND RECEIVER FUNCTION
SELECTION
The DIP switch located in the center of the board selects
the logic state applied to the XR-T3590 function control
pins SL2, SL1, and SL0.
Table 1. shows the function for
each switch setting. Note that when a DIP switch section
is "OFF," a logic 1 is applied to the corresponding IC pin.
DIP Switch Setting
Drivers
Receivers
Description
SEL2
SEL1
SEL0
On
On
ON
ON
ON
-
-
All Off
ON
ON
OFF
-
1,2,3
All Receivers Off
ON
OFF
ON
1,2,3
1,2
DCE Mode
ON
OFF
OFF
1,2,3
1,2
DCE Mode With Mirrored Loopback
OFF
ON
ON
1,2
1,2,3
DTE Mode
OFF
ON
OFF
1,2
1,2,3
DTE Mode With Mirrored Loopback
OFF
OFF
ON
1,2,3
1,2,3
All On
OFF
OFF
OFF
1,2,3
-
All Drivers On
Table 1. XR-T3590 Function Selection
XR-T3590ES
6
Rev. 1.00
XR-T3590 Ground Potential Offset Testing
The receiver ground potential offset test specified by
CCITT V.35 may be performed on the demo board. For
this test, jumper E-1 is first removed and then a DC
voltage in the range of
4 Volts is applied between the
GND and OFFSET banana jacks.
ADDENDUM
Qty.
Value
Ref. Designators
Notes
15
51.1
, 1/4W, 1% Metal Film Resistor
R1,2,3,5,7,8,10,11,
13,14,16,17,19,20,22
1
10K, 2%, 5 Resistor, Thick-Film Network,
Panasonic
R4
6
121
, 1/4W, 1% Metal Film Resistor
R6,9,12,15,18,21
2
22
F, 16V, Electrolytic, Axial Lead,
5mm Dia., 2mm Spacing, Panasonic Type
NHE
C1,2
3
0.1
F, 63V, Z5U Dilectric,
Axial Lead, 0.1" Spacing, Panasonic
C3,4,5
1
4-Position DIP Switch, CTS
S1
2
2 Pin Single-row Header, Gold
E1
1
Shorting Jumper for Above Header
6
Female BNC Connector, PC Mount
Connector For Digital I/O
6
6-pin RJ-11 Connector
Connector For Line
3
Banana Jack (1 Black, 1 Red, 1 Blue,
1 Green)
GND, V
DD
, V
SS
, OFFSET
Connectors
13
Pins for Digital I/O and Ground Pads
Digi-Key ED-5052ND, $0.0714 ea.
(Qty 100)
1
24 pin DIP Socket
4
Spacers to Elevate Board
4
4-40 x 5/16" Screws
To Attach Spacers
Table 2. List of Components
XR-T3590ES
7
Rev. 1.00
Figure 1. Component Layout
XR-T3590ES
8
Rev. 1.00
Figure 2. Circuit Diagram
1
2
3
4
J1
3 X 125
6 X 50
+
R9
R12
R6
V
SS
C4
0.1uF
V
DD
C3
0.1uF
TX1IN
TX2IN
R2
R1
Optional Input
T
ermination Resistors
R3
2
TI2
5
GND
3
RI1
13
RI2
15
RO1
11
R02
10
SEL2
8
RI3+
18
RI2+
16
SEL0
12
RI3
17
SEL1
7
RI1+
14
1
RO3
9
TI1
4
TI3
6
T
O3
19
T
O3+
20
T
O2
21
T
O2+
22
T
O1
23
T
O1+
24
U1
XR-T3590
R5
R7
R8
R10
R1
1
R13
+ 1
2
3
4
J2
TX1OUT
TX2OUT
1
2
3
4
J3
TX3OUT
+
RX1OUT
TX3IN
RX2OUT
RX3OUT
V
DD
1
234
56
R4
10K
+
1
2
3
4
J4
RX1IN
1
2
3
4
J5
RX2IN
+
R17
R19
R20
R22
R14
R16
1
2
3
4
8
7
6
5
S1
SEL2
SEL1
SEL0
Of
fset
Green
6 X 50
3 X 125
R15
R18
R21
+
1
2
3
4
J6
RX3IN
C5
0.1uF
Jumper For Operation
Without DC Of
fset
E1
V
DD
C1
22uF
+5V
Red
Ground
Black
5V
Blue
V
SS
C2
22uF
V
SS
V
DD
XR-T3590ES
Rev. 1.00
9
Notes
Rev. 1.00
E
1996
...the analog plus company
TM
EXAR Corporation
48720 Kato Road
Fremont, CA 94538
(510) 668-7000, Fax (510) 668-7017
Worldwide Web Site: http://www.exar.com
XR-T3590ES
10
Rev. 1.00
Notes
XR-T3590ES
11
Rev. 1.00
Notes
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