AD9886SLASHPCB datasheet(9/32 Pages) AD

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REV. 0

AD9886

–9–

Power Supply

Main Power Supply

These pins supply power to the main ele-

ments of the circuit. It should be as quiet and

filtered as possible.

VDD

Digital Output Power Supply

A large number of output pins (up to 52)

switching at high speed (up to 140 MHz)

generates a lot of power supply transients

(noise). These supply pins are identified

separately from the VD pins so special care

can be taken to minimize output noise trans-

ferred into the sensitive analog circuitry.

If the AD9886 is interfacing with lower-

voltage logic, VDD may be connected to a

lower supply voltage (as low as 2.5 V) for

compatibility.

PVD

Clock Generator Power Supply

The most sensitive portion of the AD9886 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.

GND

Ground

The ground return for all circuitry on chip.

It is recommended that the AD9886 be

assembled on a single solid ground plane,

with careful attention to ground current paths.

Serial Port (Two-Wire)

SDA

Serial Port Data I/O

SCL

Serial Port Data Clock

Serial Port Address Input 1

Serial Port Address Input 2

For a full description of the 2-wire serial regis-

ter and how it works, refer to the Control

SCAN Function

SCANIN

Data Input for SCAN Function

Data can be loaded serially into the 48-bit

SCAN register through this pin, clocking it in

with the SCANCLK pin. It then comes out of

the 48 data outputs in parallel. This function

is useful for loading known data into a graph-

ics controller chip for testing purposes.

SCANOUT

Data Output for SCAN Function

The data in the 48-bit SCAN register can be

read through this pin. Data is read on a FIFO

basis and is clocked via the SCANCLK pin.

SCANCLK

Data Clock for SCAN Function

This pin clocks the data through the SCAN

data output.

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