AD9880SLASHPCB datasheet(11/64 Pages) AD

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AD9880

Rev. 0 | Page 11 of 64

Description

POWER SUPPLY1

VD (3.3 V)

Analog Power Supply.

These pins supply power to the ADCs and terminators. They should be as quiet and filtered as possible.

VDD (1.8 V – 3.3 V)

Digital Output Power Supply.

A large number of output pins (up to 27) switching at high speed (up to 150 MHz) generates many power supply

transients (noise). These supply pins are identified separately from the VD pins so special care can be taken to minimize

output noise transferred into the sensitive analog circuitry. If the AD9880 is interfacing with lower voltage logic, VDD

may be connected to a lower supply voltage (as low as 1.8 V) for compatibility.

PVDD (1.8 V)

Clock Generator Power Supply.

The most sensitive portion of the AD9880 is the clock generation circuitry. These pins provide power to the clock PLL

and help the user design for optimal performance. The designer should provide quiet, noise-free power to these pins.

DVDD (1.8 V)

Digital Input Power Supply.

This supplies power to the digital logic.

GND

Ground.

The ground return for all circuitry on chip. It is recommended that the AD9880 be assembled on a single solid ground

plane, with careful attention to ground current paths.

1 The supplies should be sequenced such that VD and VDD are never less than 300 mV below DVDD. At no time should DVDD be more than 300 mV greater than VD or

VDD.

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