XRT8001IP datasheet(3/48 Pages) EXAR

3 / 48 page

XRT8001

Rev. 1.01

XRT8001

SDO

SYNC

FIN

GND

CLK1

VCC

MSB

GND

VCC

LOCKDET

VCC

CLK2

GND

VCC

SDI

SCLK

Figure 3. XRT8001 PIN OUT

PIN DESCRIPTION

Pin #

Name

Type

Description

SDO

Serial Data Output from the Microprocessor Serial Interface

This pin will serially output the contents of the specified Command

updated on the falling edge of the SCLK input signal. This pin will be tri-

stated upon completion of data transfer.

SYNC

Sync Output - The XRT8001 will typically output an 8kHz clock signal

via this output pin.

However, when the XRT8001 is operating in the “High Speed - Reverse”

Mode, then this device will simply output a 64kHz clock signal.

FIN

Reference Clock Input - The Reference Timing signal (from which the

CLK1 and CLK2 output signals are derived) is to be input via this pin.

GND

Digital Ground

GND

Digital Ground

CLK1

Clock Output 1 - The XRT8001 will drive the desired “synthesized”

signal via this output pin. This output signal will have a 50+5% duty

cycle.

Note: This output pin is tri-stated unless the “CLK1EN” bit-field (within

Command Register CR4) has been set to “1”.

Digital Power Supply

XRT8001IP Datasheet(PDF) 3 Page - Exar Corporation

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