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XR-T3589CN Datasheet(PDF) 5 Page - Exar Corporation |
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XR-T3589CN Datasheet(HTML) 5 Page - Exar Corporation |
5 / 12 page XR-T3588-89ES ...the analog plus companyTM XR-T3588/89 Evaluation System Rev. 1.00 5 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 Ω) 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 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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