AZ12000 Ver la hoja de datos (PDF) - Arizona Microtek, Inc

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Fabricante

AZ12000

Phase-Locked Loop Clock Generator

Arizona Microtek, Inc 

AZ12000

AZ12001

Internal Reference Oscillator

The PLL reference can be generated either with an internal oscillator or with an external source. In either case, the input

is the REFIN pin. This should be AC coupled since the input is internally biased to VBB. The REFOUT pin should be left

open when an external reference is used.

The exact topology of the crystal circuit will vary based on the resonant mode of the crystal. The circuit shown is for a

series resonant crystal. The AC gain between the REFIN and REFOUT pins is approximately 20. This value is sufficient

to overcome crystal matching network losses without phase noise degradation caused by an excessive drive level. An

internal current source on REFOUT eliminates the need for an external load resistor.

L3

Y1

C4

REFOUT

OUTPT

DRVR

4mA

(GROVUEEND)

REFIN INPUT

RCVR

C3

470 Ω

GROUND

VBB

VBB

Figure 1 Reference Oscillator

January 2005 * REV - 3

www.azmicrotek.com

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