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| ...the analog plus company TM XR-T3588-89ES November 1996-3 XR-T3588/89 Evaluation System User Manual Rev. 1.00 E1996 EXAR Corporation, 48720 Kato Road, Fremont, CA 94538 z (510) 668-7000 z 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 2 Table of Contents OVERVIEW . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . POWER REQUIREMENTS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XR-T3588 DIGITAL INPUT AND XR-T3589 DIGITAL OUTPUT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . XR-T3588 LINE OUTPUT AND XR-T3589 LINE INPUT CONNECTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . TRANSMITTER AND RECEIVER POWER-DOWN . . . . . . . . . . . . . . . . . . . . . . . . . . Table 1. XR-T3588 Transmitter Selection . . . . . . . . . . . . . . . . . . . . . . . . Table 2. XR-T3589 Receiver Selection . . . . . . . . . . . . . . . . . . . . . . . . . . XR-T3589 GROUND POTENTIAL OFFSET TESTING . . . . . . . . . . . . . . . . . . . . . . . ADDENDUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Table 3. List of Components . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 2. Component Layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Figure 3. Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5 5 5 5 5 5 6 6 6 6 7 8 Rev. 1.00 3 XR-T3588-89ES This Page Intentionally Left Blank Rev. 1.00 4 XR-T3588-89ES ...the analog plus company TM XR-T3588/89 Evaluation System OVERVIEW 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. 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 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. 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.) TRANSMITTER AND RECEIVER POWER-DOWN 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 Transmitter 1, 2, 3, On 1, 2, On 1 On All Off TX Switch Sections SEL A Off Off On On SEL B Off On Off On Table 1. XR-T3588 Transmitter Selection Rev. 1.00 5 XR-T3588-89ES XR-T3589 Receiver 1, 2, 3, On 1, 2, On 1 On All Off RX Switch Sections SEL A Off Off On On SEL B Off On Off On Table 2. XR-T3589 Receiver Selection XR-T3589 GROUND POTENTIAL OFFSET TESTING The receiver ground potential offset test specified by CCITT V.35 may be performed on the demo board. For ADDENDUM 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. Qty. 15 1 6 1 2 Value 51.1, 1/4W, 1% Metal Film Resistor 10K, 2%, 5 Resistor, Thick-Film Network, Panasonic 121, 1/4W, 1% Metal Film Resistor 3.92K, 1/4W, 1% Metal Film Resistor 22F, 16V, Electrolytic, Axial Lead, 5mm Dia., 2mm Spacing, Panasonic Type NHE 0.1F, 63V, Z5U Dilectric, Axial Lead, 0.1" Spacing, Panasonic 4-Position DIP Switch, CTS 2 Pin Single-Row Header, Gold Shorting Jumper for Above Header Female BNC Connector, PC Mount 6-Pin RJ-11 Connector Banana Jack (1 Black, 1 Red, 1 Blue, 1 Green) Pins for Digital I/O and Ground Pads 14 pin DIP Socket 18 pin DIP Socket Spacers to Elevate Board 4-40 x 5/16" Screws Ref. Designators R1,2,3,5,7,8,10,11, 13,14,16,17,19,20,22 R4 R6,9,12,15,18,21 R23 C1,2 Notes 5 1 2 1 6 6 3 13 1 1 4 4 C3,4,5,6,7 S1 E1 Connector for Digital I/O Connector for Line GND, VCC, VSS, OFFSET Connectors To Attach Spacers Table 3. List of Components Rev. 1.00 6 XR-T3588-89ES Figure 1. Component Layout Rev. 1.00 7 VCC C3 R6 6 X 50 R5 VREF 1 R7 17 18 13 + 15 14 - 10 J3 12 11 - + - J2 R10 R13 4 I/P 1 I/P 2 I/P 3 U1 SELA O/P 2A SELB VREF 3 8 BIAS O/P 3B O/P 3A GND 1 VCC VEE VCC R4 R23 3.9K 2 3 45 6 C5 0.1uF 1 4 7 VEE + 4 O/P 1 I/P 1B I/P 1A U2 I/P 2A 2 SELA SELB GND VCC C1 22uF R16 R19 1 6 X 50 - 3 X 125 R15 R18 R21 Jumper For Operation Without Dc Offset E1 C7 0.1uF R22 3 I/P 3B I/P 3A I/P 2B 13 - 10 11 8 9 R14 R17 R20 + 1 2 3 4 - J6 RX3IN J5 + 1 2 3 4 RX2IN O/P 2 O/P 3 5 6 12 J4 1 2 3 4 RX1IN VCC 0.1uF 1 2 3 4 C6 1 O/P 2B VREF 2 0/P 1A O/P 1B 5 6 2 R2 3 R3 16 + 1 2 3 4 R8 R11 J1 R9 R12 0.1uF 7 VCC VEE 9 0.1uF C4 3 X 125 XR-T3588-89ES Rev. 1.00 VEE TX1OUT 1 2 3 4 TX2OUT 1 2 3 4 TX3OUT TX1IN TX2IN TX3IN R1 Optional Input Termination Resistors 10K XR-T3588 S1 8 XR-T3589 C2 22uF VEE T3588 T3589 SELB SELA SELB SELA 8 7 6 5 RX1OUT RX2OUT RX3OUT Green Offset Red +5V Black Ground Blue -5V Figure 2. Circuit Diagram XR-T3588-89ES Notes Rev. 1.00 9 ...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 E1996 XR-T3588-89ES Notes Rev. 1.00 10 XR-T3588-89ES Notes Rev. 1.00 11 |
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