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CX72300

更新时间： 2024-02-28 19:45:13

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Dual Fractional-N Synths/PLLs Freq Asked Questions\|Wireless Infrastructure RF/lF ICs:Dual Fractional-N Synthesizers/PLLs

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CX72300 数据手册

Dual Fractional-N Synthesizers/PLLs Frequently

Asked Questions

This document provides answers to the following frequently

asked questions (FAQs) related to fractional-N synthesizers in

general, and to Skyworks’ CX72300, CX72301, CX72302, and

CX74038 fractional-N synthesizers and their respective

Evaluation Boards, specifically:

I am only interested in using the CX7230x main synthesizer. Do

I need to apply power to the auxiliary supply pins?

Does charge pump current setting affect phase noise?

Is there a charge pump polarity reversal function?

What is the CX7230x VCO divider input impedance?

General Questions

What are the design trade-offs associated with fractional-N

synthesizers?

When the CX7230x is in power-down mode, is the crystal

oscillator still operable?

What is the primary benefit of fractional-N synthesizers?

What is the expected lock-up time?

Can I use a lower reference frequency with the fractional-N

synthesizers?

How do I calculate loop filter component values?

What is the Direct Digital Modulation feature of the CX7230x

synthesizers?

What spurs can be expected from fractional-N synthesizers

versus integer-N synthesizers?

How does the CX7230x “frequency power steering” feature

operate?

What is meant by the term “spur-free”?

Does fractional-N offer improved phase noise over integer-N?

Does fractional-N offer improved switching time over integer-N?

CX7230x and CX74038 Evaluation Boards

Where do I purchase Evaluation Boards?

While using the CX74038, I have noticed a pulsating phase

noise effect when viewing the VCO output spectrum (on a

1 MHz span setting). It appears like a wave washing in towards

the carrier from both sides and then it washes out, away from

the carrier and repeats at a slow rate of about once every

second. Is this normal behavior? How can it be eliminated?

The CX7230x Evaluation Boards use baluns on the VCO divider

inputs. Are the baluns necessary?

Why is there a dithering disable function on the CX74038?

What are the design trade-offs associated with fractional-N

synthesizers?

Skyworks’ Synthesizer Package Types

I noticed the CX7230x package is a 28-pin EP-TSSOP. What

does “EP” mean?

This subject is fully discussed in the Basics of Dual Fractional-N

Synthesizers/PLLs White Paper (document number 101463)

available at http://www.skyworksinc.com/.

Are the CX7230x synthesizers available in other package

types?

In what package type is the CX74038 available?

Synthesizer Functioning

What are the differences between the CX7230x group of

synthesizers and the CX74038?

FAQ

Skyworks

103037A

Proprietary Information and Specifications Are Subject to Change

November 4, 2002

12 3 4 5 6

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与CX72300相关器件

型号	品牌	获取价格	描述	数据表
CX72301	ETC	获取价格	Spur-Free, 1.0 GHz Dual Fractional-N Frequency Synthesizer
CX72301-11	ETC	获取价格	Spur-Free, 1.0 GHz Dual Fractional-N Frequency Synthesizer
CX72302	ETC	获取价格	CX72302: Spur-Free, 6.1 GHz Dual Fractional-N Frequency Synthesizer
CX72302-11	SKYWORKS	获取价格	PLL Frequency Synthesizer, PDSO28, EXPOSED PAD, TSSOP-28
CX72303	ETC	获取价格	CX72303 1.8 V Ultra Low Power Bluetooth? RF Tx\|Bluetooth? RF Transceiver
CX74001	SKYWORKS	获取价格	Rx ASIC for CDMA, AMPS, and PCS Applications
CX74001-12	SKYWORKS	获取价格	RF and Baseband Circuit, BICMOS, 7 X 7 MM, LGA-48
CX74002	ETC	获取价格	Silicon Germanium CDMA Transmit/Dual PLL RFlC
CX74005	SKYWORKS	获取价格	VGA + I/Q Demodulator Rx ASIC for Portable Phone Applications
CX74016	SKYWORKS	获取价格	RF and Baseband Circuit, 10 X 10 MM, LGA-72

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