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SPT9689ACU Datasheet(PDF) 6 Page - Cadeka Microcircuits LLC. |
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SPT9689ACU Datasheet(HTML) 6 Page - Cadeka Microcircuits LLC. |
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6 / 8 page  6 2/20/01 SPT9689 TYPICAL INTERFACE CIRCUIT The typical interface circuit using the comparator is shown in figure 3. Although it needs few external components and is easy to apply, there are several conditions that should be noted to achieve optimal performance. The very high operating speeds of the comparator require careful layout, decoupling of supplies, and proper design of trans- mission lines. Since the SPT9689 comparator is a very high-frequency and high-gain device, certain layout rules must be fol- lowed to avoid oscillations. The comparator should be soldered to the board with component lead lengths kept as short as possible. A ground plane should be used while the input impedance to the part is kept as low as possible to decrease parasitic feedback. If the output board traces are longer than approximately half an inch, microstripline techniques must be employed to prevent ringing on the output waveform. Also, the microstriplines must be termi- nated at the far end with the characteristic impedance of the line to prevent reflections. Both supply voltage pins should be decoupled with high-frequency capacitors as close to the device as possible. All ground pins and no connects should be soldered to a common ground plane to further improve noise immunity. If using the SPT9689 as a single comparator, the outputs of the inactive com- parator can be grounded, left open, or terminated with 50 ohms to –2 V. All outputs on the active comparator, whether used or unused, should have identical termina- tions to minimize ground current switching transients. Figure 3 – SPT9689 Typical Interface Circuit Figure 4 – SPT9689 Typical Interface Circuit with Hysteresis VIN +5.0 V 10 µF 0.1 µF 100 pF 10 µF 0.1 µF 100 pF 5.2 V 2 V RL RL 10 F +VCC LE LE VEE GND + Q Output Q Output VREF 100 pF 10 µF 0.1 µF 50 W 50 W ECL NOTES: Denotes ground plane. Ferrite bead. Fair Rite Part # 2643001501. All resistors are chip type 1%. 0.1 µF and 100 pF capacitors are chip type mounted as close to the pins as possible. 10 µF tant capacitors have lead lengths <0.25" long. Represents line termination. 100 pF VIN +5.0 V 10 µF 0.1 µF 100 pF 10 µF 0.1 µF 10 µF 0.1 µF 100 pF 5.2 V 2 V 10 µF 2 V 1.3 V +VCC LE LE VEE GND + 100 W 0 to 200 W VREF 50 W NOTES: Denotes ground plane. Ferrite bead. Fair Rite Part # 2643001501. All resistors are chip type 1%. 0.1 µF and 100 pF capacitors are chip type mounted as close to the pins as possible. 10 µF tant capacitors have lead lengths <0.25" long. Represents line termination. Q Output Q Output RL 50 W RL |
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