TDA5211 View Datasheet(PDF) - Infineon Technologies

Part Name

Description

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TDA5211

ASK/FSK Single Conversion Receiver

Infineon Technologies 

TDA 5211

Applications

4.3 Quartz Load Capacitance Calculation

The value of the capacitor necessary to achieve that the quartz oscillator is

operating at the intended frequency is determined by the reactive part of the

negative resistance of the oscillator circuit as shown in Section 5.1.3 and by the

quartz specifications given by the quartz manufacturer.

Crystal

CS

Input

impedance

Z1-28

Pin 28

TDA5211

Pin 1

Figure 4-4

Quartz_load_5211.wmf

Determination of Series Capacitance Value for the Quartz Oscillator

Crystal specified with load capacitance

CS

=

1

Cl

1

+ 2π

f

XL

with Cl the load capacitance (refer to the quartz crystal specification).

Example:

10.18 MHz: CL = 12 pF

XL=870 Ω

CS = 7.2 pF

This value may be obtained by putting two capacitors in series to the quartz,

such as 18pF and 22pF in the 5.1MHz case and 18pF and 12pF in the 10.2MHz

case.

Wireless Components

4-5

Specification, May 2001

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