...the analog plus company TM
XR-T3588-89ES
November 1996-3
XR-T3588/89
Evaluation System
User Manual
Rev. 1.00
1996
EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 (510) 668-7000 FAX (510) 668-7017
XR-T3588-89ES
NOTICE
EXAR Corporation reserves the right to make changes to the products contained in this publication in order to improve design, performance or reliability. EXAR Corporation assumes no responsibility for the use of any circuits described 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 circumstances.
Copyright 1996 EXAR Corporation
User Manual November 1996
Reproduction, in part or whole, without the prior written consent of EXAR Corporation is prohibited.
Rev. 1.00
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Table of Contents
OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
XR-T3588 DIGITAL INPUT AND XR-T3589
DIGITAL OUTPUT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
XR-T3588 LINE OUTPUT AND XR-T3589 LINE INPUT
CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
5
TRANSMITTER AND RECEIVER POWER-DOWN . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 1. XR-T3588 Transmitter Selection . . . . . . . . . . . . . . . . . . . . . . . .
Table 2. XR-T3589 Receiver Selection . . . . . . . . . . . . . . . . . . . . . . . . . .
5
5
6
XR-T3589 GROUND POTENTIAL OFFSET TESTING . . . . . . . . . . . . . . . . . . . . . . .
6
ADDENDUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Table 3. List of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 2. Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Figure 3. Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
6
6
7
8
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XR-T3588-89ES
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XR-T3588-89ES
XR-T3588/89
Evaluation System
...the analog plus company TM
OVERVIEW
Likewise, the TTL compatible receiver outputs are the
BNC connectors labeled RX1OUT, RX2OUT and
RX3OUT.
This unit is a 4.5 by 5.0 inch circuit board that simplifies the
evaluation of the XR-T3588 line driver and the XR-T3589
line receiver devices in a CCITT V.35 application. Its
features include dip switch selection of channel
power-down 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 3. show the demo board component layout, circuit
diagram and list of components respectively.
XR-T3588 LINE OUTPUT AND XR-T3589 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.)
POWER REQUIREMENTS
Supply voltages of +5.0V 5% for VCC and -5.0V 5%
for VEE are applied to the board through banana jacks.
Both power sources should be well-regulated, and each
must be capable of supplying 250mA minimum. During
normal operation jumper E-1 must be installed, and
nothing is connected to the banana jack labeled OFFSET.
XR-T3588 DIGITAL INPUT AND XR-T3589 DIGITAL
OUTPUT CONNECTIONS
TRANSMITTER AND RECEIVER POWER-DOWN
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 75Ω) 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.
The four-position DIP switch located in the center of the
board selects the logic state applied to the transmitter and
receiver channel enable pins. The top two sections
labeled TX, and the bottom two sections labeled RX are
for the XR-T3588 and XR-T3589 respectively. Table 1.
and Table 2. show the powering options. Note that when
a DIP switch section is “OFF,” a logic 1 is applied to the
corresponding IC pin.
XR-T3588
TX Switch Sections
Transmitter
SEL A
SEL B
1, 2, 3, On
Off
Off
1, 2, On
Off
On
1 On
On
Off
All Off
On
On
Table 1. XR-T3588 Transmitter Selection
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5
XR-T3588-89ES
XR-T3589
RX Switch Sections
Receiver
SEL A
SEL B
1, 2, 3, On
Off
Off
1, 2, On
Off
On
1 On
On
Off
All Off
On
On
Table 2. XR-T3589 Receiver Selection
XR-T3589 GROUND POTENTIAL OFFSET TESTING
this test, jumper E-1 is first removed and then a DC
voltage in the range of 4V is applied between the GND
and OFFSET banana jacks.
The receiver ground potential offset test specified by
CCITT V.35 may be performed on the demo board. For
ADDENDUM
Qty.
Value
Ref. Designators
15
51.1Ω, 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
121Ω, 1/4W, 1% Metal Film Resistor
R6,9,12,15,18,21
1
3.92K, 1/4W, 1% Metal Film Resistor
R23
2
22µF, 16V, Electrolytic, Axial Lead,
5mm Dia., 2mm Spacing, Panasonic Type
NHE
0.1µF, 63V, Z5U Dilectric,
Axial Lead, 0.1” Spacing, Panasonic
C1,2
5
1
Notes
C3,4,5,6,7
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, VCC, VSS, OFFSET
Connectors
13
Pins for Digital I/O and Ground Pads
1
14 pin DIP Socket
1
18 pin DIP Socket
4
Spacers to Elevate Board
4
4-40 x 5/16” Screws
To Attach Spacers
Table 3. List of Components
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6
XR-T3588-89ES
Figure 1. Component Layout
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7
Rev. 1.00
8
+5V
Offset
–5V
Blue
Black
Red
Green
RX3OUT
RX2OUT
RX1OUT
SELB
SELA
SELB
SELA
Ground
T3589
T3588
8
7
6
5
Optional Input
Termination Resistors
TX3IN
TX2IN
TX1IN
S1
1
2
3
4
10K
R1
R4
1
VCC
R3
VEE
C2
22uF
C1
22uF
VCC
2 3 4 5 6
R2
3
2
6
5
4
BIAS
SELB
SELA
I/P 3
I/P 2
I/P 1
U1
9
8
11
10
13
12
3 X 125 Ω
6 X 50 Ω
0.1uF
C6
R5
R14
Figure 2. Circuit Diagram
1
GND
I/P 3A
I/P 3B
I/P 2A
I/P 2B
I/P 1A
I/P 1B
7
VEE
VEE
VCC
U2
1
11
12
10
14
15
13
18
17
16
XR-T3588
O/P 3A
O/P 3B
VREF 3
O/P 2A
O/P 2B
VREF 2
0/P 1A
O/P 1B
1
4
VCC
GND
VEE
VCC
0.1uF
C4
VREF 1
9
VEE
7
XR-T3589
SELB
SELA
O/P 3
O/P 2
O/P 1
C5
0.1uF
R23
3.9K
8
3
2
6
5
4
C3
0.1uF
VCC
R7
R6
R15
R16
R17
R8
R11
C7
0.1uF
R18
R19
R20
R10
R9
R21
E1
R22
R13
R12
–
–
+
–
+
–
+
–
+
+
–
+
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
1
2
3
4
J6
J5
J4
J3
J2
J1
Jumper For Operation
Without Dc Offset
6 X 50 Ω
3 X 125 Ω
RX3IN
RX2IN
RX1IN
TX3OUT
TX2OUT
TX1OUT
XR-T3588-89ES
XR-T3588-89ES
Notes
Rev. 1.00
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...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
Rev. 1.00
1996
XR-T3588-89ES
Notes
Rev. 1.00
10
XR-T3588-89ES
Notes
Rev. 1.00
11