RF64 datasheet(66/76 Pages) ETC2

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ADVANCED COMMUNICATIONS & SENSING

Page 66 of 76

RF64

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7. Application Information

7.1. Crystal Resonator Specification

Table 34 shows the crystal resonator specification for the crystal reference oscillator circuit of the RF64. This

specification covers the full range of operation of the RF64 and is employed in the reference design (see section

7.5.3).

Table 34: Crystal Resonator Specification

Name

Description

Min.

Typ.

Max.

Unit

Fxtal

Nominal frequency

12.800

MHz

Cload

Load capacitance for Fxtal

13.5

16.5

Motional resistance

100

ohms

Shunt capacitance

Fxtal

Calibration tolerance at 25+/-3°C

-15

+15

ppm

Fxtal(T)

Stability over temperature range [-40°C ; +85°C]

-20

+20

ppm

Fxtal(t)

Ageing tolerance in first 5 years

-2

ppm/year

Note that the initial frequency tolerance, temperature stability and ageing performance should be chosen in

accordance with the target operating temperature range and the receiver bandwidth selected.

7.2. Software for Frequency Calculation

The R1, P1, S1, and R2, P2, S2 dividers are configured over the SPI interface and programmed by 8 bits each, at

addresses 6 to 11. The frequency pairs may hence be switched in a single SPI cycle.

7.2.1. GUI

To aid the user with calculating appropriate R, P and S values, software is available to perform the frequency

calculation.

7.2.2. .dll for Automatic Production Bench

The Dynamically Linked Library (DLL) used by the software to perform these calculations is also provided, free of

charge, to users, for inclusion in automatic production testing. Key benefits of this are:



No hand trimming of the reference frequency required: the actual reference frequency of the Device Under Test

(DUT) can be easily measured (e.g. from the CLKOUT output of the RF64) and the tool will calculate the

best frequencies to compensate for the crystal initial error.

 Channel plans can be calculated and stored in the application

‟s memory, then adapted to the actual crystal

oscillator frequency.

7.3. Switching Times and Procedures

As an ultra-low power device, the RF64 can be configured for low minimum average power consumption. To

minimize consumption the following optimized transitions between modes are shown.

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