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V8038QC

更新时间： 2022-04-23 23:00:11

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V8038QC 数据手册

(Preliminary) ABV8037/38/39

38MHz-320MHz Low Phase Noise VCXO

FREQUENCY SELECTION TABLE

SEL2

SEL1

SEL0

Selected Multiplier/Output Frequency

VCO Max*

VCO Min*

Reserved

Fin x 2

Fin x 8

Fin x 16

Fin x 4

All SEL pads have internal pull-ups (default value is ‘1’). Bond to GND to set to 0.

* Special Test Modes to help selecting the inductor value for the target output frequency.

PERFORMANCE TUNING & INDUCTOR VALUE SELECTION

Please refer to Abracon’s ‘Tuning Assistant’ software to automatically calculate the optimum inductor values for

your application. In addition, the chart below could be used as a reference for quick inductor value selection.

Please note that the inductor values mentioned in the table below, or when using the ‘Tuning Assistant’ are

derived based on the parasitic values of Abracon’s evaluation board. For performance enhancement of your

custom board design, please follow the following instruction:

Use the special test modes “VCO Max” and “VCO Min” to determine the optimum inductor value. “VCO Max”

represents the high end of the VCO range and “VCO Min” represents the low end of the VCO range. The output

frequency in the “VCO Max” and “VCO Min” test modes is VCO/16. This means that the output frequencies are

around the crystal frequency that will be used. The optimum inductor value is where the target crystal frequency

is closest to the middle between the “VCO Max” and “VCO Min” output frequencies. In this case the VCO will lock

in the middle of its tuning range with maximum margin on either side.

30332 Esperanza., Rancho Santa Margarita, Ca 92688 Ph: 949-546-8000 Fax: 949-546-8001 www.Abracon.com 9/1/05 Page 3

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