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T7906E Datasheet(PDF) 11 Page - ATMEL Corporation |
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T7906E Datasheet(HTML) 11 Page - ATMEL Corporation |
11 / 43 page 11 4166D–AERO–04/07 T7906E PLL-Filter The pin PLLOUT should be connected as shown below: • R1 = 249_ ± 5%, ¼W • C1 = 1nF, ± 5%, 20V • C2 = 15nF, ± 5%, 20V Power and Ground Guidelines To achieve its fast cycle time, the T7906E is designed with high speed drivers on output pins. Large peak currents may pass through a circuit board’s ground and power lines, especially when many output drivers are simultaneously charging or discharging their load capacitances. These transient currents can cause disturbances on the power and ground lines. To minimize these effects, the T7906E provides separate supply pins for its internal logic and for its external drivers. All GND pins should have a low impedance path to ground. A ground plane is required in T7906E systems to reduce this impedance, minimizing noise. The VCC pins should be bypassed to the ground plane using 8 high-frequency capacitors (0.1 mF ceramic). Keep each capacitor’s lead and trace length to the pins as short as possible. This low inductive path provides the T7906E with the peak currents required when its output drivers switch. The capacitors’ ground leads should also be short and connect directly to the ground plane. This provides a low impedance return path for the load capacitance of the T7906E output drivers. The following pins must have a capacitor: 1, 4, 16, 27, 56, 61, 88 and 99. T7906E PLLOUT C1 R1 C2 |
Similar Part No. - T7906E_14 |
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Similar Description - T7906E_14 |
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