AD9559PCBZ datasheet(58/120 Pages) AD

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AD9559

Data Sheet

Rev. 0 | Page 58 of 120

POWER SUPPLY PARTITIONS

The AD9559 power supplies are in two groups: VDD3 and VDD. All

power and ground pins should be connected, even if certain blocks

of the chip are powered down.

Ferrite beads with low (< 0.7 Ω) dc resistance and approximately 600 Ω

impedance at 100 MHz are suitable for this application.

3.3 V SUPPLIES

All of the 3.3 V supplies can be supplied from one 3.3V power supply.

Pin 28 is a serial port power supply and does not require a ferrite

bead from the 3.3 V source.

Pin 1, Pin 12, Pin 18, and Pin 72 belong to PLL_0. It is advisable, but

not mandatory, to have a place for a ferrite bead to isolate them from

the 3.3 V source. The need for a ferrite bead depends on how quiet the

3.3 V source is. This group of pins never consumes more than 90 mA.

Pin 37, Pin 43, Pin 54, and Pin 55 belong to PLL_1, and the same

recommendation given for the PLL_0 3.3 V pins applies here as well.

1.8 V SUPPLIES

All of the 1.8 V supplies can be connected to one common

1.8 V source.

Six ferrite beads should be used in the following locations:

•

Between the 1.8 V source and Pin 13

•

Between the 1.8 V source and Pin 14

•

Between the 1.8 V source and Pin 17

•

Between the 1.8 V source and Pin 38

•

Between the 1.8 V source and Pin 41

•

Between the 1.8 V source and Pin 42

The remaining VDD pins can be connected directly to the

1.8 V source.

BYPASS CAPACITORS FOR PIN 21 AND PIN 33

The performance of the AD9559 is enhanced by the use of a

Size 0201, 0.1 µF capacitor between Pin 21 and Pin 22, as well as

between Pin 33 and Pin 34, placed as close to the AD9559 as

possible and without the use of vias.

AD9559PCBZ Datasheet(PDF) 58 Page - Analog Devices

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