TDA5150 datasheet(8/106 Pages) INFINEON

部件名	TDA5150

功能描述	On-chip, high resolution fractional-N synthesizer and Sigma-Delta modulator with ASK, FSK, GFSK options

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制造商	INFINEON [Infineon Technologies AG]

网页	http://www.infineon.com

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TDA 5150

Product Description

Data Sheet

8

V 1.0, July 2009

The matching shown is an example for a loop antenna application. Different antenna

types (electrical monopole or dipole, magnetic loop etc.) as well as different layout

versions might require component values which can differ from those given in above

example. The antenna geometry has a major influence on the antenna impedance and

consequently on the component values in the matching network.

1.5.2

Sigma-Delta fractional-N PLL with High Resolution

This type of PLL offers a multitude of advantages compared to fixed, integer division ratio

PLLs.

In the reference oscillator circuit the same crystal can be used for all of the RF bands

and frequencies (for example a 13 MHz crystal).

Dedicated crystals for each frequency are no longer required.

However by choice of crystal frequency a phenomenon, known as occurrence of

fractional-N spurs must be kept in mind. The phenomenon and the countermeasures

which should be taken to avoid it are described in detail in Chapter 2.4.6.1.

The PLL allows a direct (G)FSK modulation for reduced spurs and harmonics with high

accuracy and resolution compared to legacy transmitters using crystal pulling for FSK

modulation.

Synthesizer resolution down to 7 Hz for carrier frequency and FSK deviation allows fine

tuning, correction of crystal tolerances and for temperature drift.

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