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EVM749EVM Datasheet(PDF) 6 Page - Semtech Corporation |
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EVM749EVM Datasheet(HTML) 6 Page - Semtech Corporation |
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6 / 14 page  6 2000 Semtech Corp. www.semtech.com EDGE HIGH-PERFORMANCE PRODUCTS Edge749 Application Information Power Supplies The Edge749 uses three power supplies – VDD, VCC and VEE. VDD, typically +5V, is the digital supply for all of the data inputs and outputs. VCC and VEE are the analog power supplies for the DUT drivers and comparators. VCC can range from +10V to +18V, and must be greater than or equal to VDD. VEE is the negative analog power and may vary from 0V to –3V. The Edge749 has several power supply requirements to protect the part in power supply fault situations, as well as during power up and power down sequences. VCC must remain greater than or equal to VDD at all times. Both VCC and VDD must always be positive (above ground), and VEE must always be negative (at or below ground). The three-Schottky diode configuration shown in Figure 5, used on a once-per-board basis, insures power supply sequence and fault tolerance. Figure 5. Power Supply Protection Scheme Power Supplies Decoupling VDD, which provides the digital power, should be decoupled to GND with a .1 µF chip capacitor in parallel with a .001 µF chip capacitor. The bypass capacitors should be as close to the device as possible. Power and ground planes are recommended to provide a low inductance return path. VCC and VEE, which power the DUT drivers and receivers, should also be decoupled to GND with a .1 µF chip capacitor in parallel with a .001 µF chip capacitor. A VCC and VEE plane, or at least a solid power bus, is recommended for optimal performance. VHIGH and VLOW Decoupling As the VHIGH and VLOW inputs are unbuffered and must supply the driver output current, decoupling capacitors for these inputs are recommended in proportion to the amount of output current the application requires. Expanding the Common Mode Range Although the Edge749 can drive and receive 18 V swings, these 18 V signals can be adjusted over an 21 V range. By using programmable regulators V1 and V2 for the VCC and VEE supplies (feasible because these two analog power supplies do not supply driver output current), the Edge749 I/O range can be optimized for a variety of applications (see Figure 6). Figure 6. There are three rules which govern the supplies V1 and V2: 1) +10V < V1 < +18V 2) –3V < V2 < 0V 3) (V1 – V2) < +18V. VCC VDD VEE 1N5820 or Equivalent V1 Edge 749 V2 VCC VDD |
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