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AD9510 Arkusz danych(PDF) 53 Page - Analog Devices |
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AD9510 Arkusz danych(HTML) 53 Page - Analog Devices |
53 / 56 page Data Sheet AD9510 Rev. B | Page 53 of 56 POWER SUPPLY The AD9510 requires a 3.3 V ± 5% power supply for VS. The tables in the Specifications section give the performance expected from the AD9510 with the power supply voltage within this range. The absolute maximum range of −0.3 V − +3.6 V, with respect to GND, must never be exceeded on the VS pin. Follow good engineering practice in the layout of power supply traces and the ground plane of the printed circuit board (PCB). Bypass the power supply on the PCB with adequate capacitance (>10 µF). Bypass the AD9510 with adequate capacitors (0.1 µF) at all power pins as close as possible to the part. The layout of the AD9510 evaluation board (AD9510/PCBZ or AD9510-VCO/PCBZ) is a good example. The AD9510 is a complex part that is programmed for its desired operating configuration by on-chip registers. These registers are not maintained over a shutdown of external power. This means that the registers can lose their programmed values if VS is lost long enough for the internal voltages to collapse. Careful bypassing protects the part from memory loss under normal conditions. Nonetheless, it is important that the VS power supply not become intermittent, or the AD9510 risks losing its programming. The internal bias currents of the AD9510 are set by the RSET and CPRSET resistors. These resistors must be as close as possible to the values given as conditions in the Specifications section (RSET = 4.12 kΩ and CPRSET = 5.1 kΩ). These values are standard 1% resistor values, and are readily obtainable. The bias currents set by these resistors determine the logic levels and operating conditions of the internal blocks of the AD9510. The performance figures given in the Specifications section assume that these resistor values are used. The VCP pin is the supply pin for the charge pump (CP). The voltage at this pin (VCP) can be from VS up to 5.5 V, as required to match the tuning voltage range of a specific VCO/VCXO. This voltage must never exceed the absolute maximum of 6 V. Additionally, never allow VCP to be less than −0.3 V below VS or GND, whichever is lower. The exposed metal paddle on the AD9510 package is an electrical connection, as well as a thermal enhancement. For the device to function properly, the paddle must be properly attached to ground (GND). The PCB acts as a heat sink for the AD9510; therefore, this GND connection must provide a good thermal path to a larger dissipation area, such as a ground plane on the PCB. See the layout of the AD9510 evaluation board (AD9510/PCBZ or AD9510-VCO/PCBZ) for a good example. POWER MANAGEMENT The power usage of the AD9510 can be managed to use only the power required for the functions being used. Unused features and circuitry can be powered down to save power. The following circuit blocks can be powered down, or are powered down when not selected (see the Register Map and Description section): • The PLL section can be powered down if not needed. • Any of the dividers are powered down when bypassed— equivalent to divide-by-one. • The adjustable delay blocks on OUT5 and OUT6 are powered down when not selected. • Any output can be powered down. However, LVPECL outputs have both a safe and an off condition. When the LVPECL output is terminated, use only the safe shutdown to protect the LVPECL output devices. This still consumes some power. • The entire distribution section can be powered down when not needed. Powering down a functional block does not cause the program- ming information for that block (in the registers) to be lost. This means that blocks can be powered on and off without otherwise having to reprogram the AD9510. However, synchro- nization is lost. A SYNC must be issued to resynchronize (see the Single-Chip Synchronization section). |
Podobny numer części - AD9510_15 |
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Podobny opis - AD9510_15 |
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