AD9559BCPZ datasheet(19/120 Pages) AD

19 / 120 page

Data Sheet

AD9559

Rev. 0 | Page 19 of 120

Pin No.

Mnemonic

Input/

Output

Pin Type

Description

XOB

Differential

input

Complementary System Clock Input. Complementary signal to XOA. XOB contains

internal dc biasing and should be ac-coupled with a 0.1 μF capacitor except when

using a crystal. When a crystal is used, connect the crystal across XOA and XOB.

XOA

Differential

input

System Clock Input. XOA contains internal dc biasing and should be ac-coupled

with a 0.01 μF capacitor except when using a crystal. When a crystal is used,

connect the crystal across XOA and XOB. Single-ended 1.8 V CMOS is also an option,

but a spur may be introduced if the duty cycle is not 50%. When using XOA as

a single-ended input, connect a 0.1 μF capacitor from XOB to ground.

REFB

Differential

input

Reference B Input. This internally biased input is typically ac-coupled; when

configured in this manner, it can accept any differential signal with single-ended

swing up to 3.3 V. If dc-coupled, input can be LVPECL, LVDS, or single-ended CMOS.

REFBE

Differential

input

Complementary Reference B Input. Complementary signal to the input provided

on Pin 70.

GND

Exposed pad

The exposed pad is the ground connection on the chip. It must be soldered to the

analog ground of the PCB to ensure proper functionality and heat dissipation,

noise, and mechanical strength benefits.

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