MC33696FCAE datasheet(9/64 Pages) FREESCALE

Part #	MC33696FCAE

Description	PLL Tuned UHF Transceiver for Data Transfer Applications

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Manufacturer	FREESCALE [Freescale Semiconductor, Inc]

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Frequency Planning

MC33696 Data Sheet, Rev. 9

Freescale Semiconductor

9

10

Frequency Planning

10.1 Clock Generator

All clocks running in the circuit are derived from the reference frequency provided by the crystal oscillator

(frequency fref, period tref). The crystal frequency is chosen in relation to the band in which the MC33696

has to operate. Table 4 shows the value of the CF bits.

10.2 Intermediate Frequency

The IF filter is controlled by the crystal oscillator to guarantee the frequency over temperature and voltage

range. The IF filter center frequency, FIF, can be computed using the crystal frequency fref and the value

of the CF bits:

•

If CF[0] = 0 : FIF = fref/9*1.5/2

•

If CF[0] = 1 : FIF = fref/12*1.5/2

The cut-off frequency given in the parametric section can be computed by scaling to the FIF.

Example 1. Cut-off Frequency Computation

Compute the low cut-off frequency of the IF filter for a 16.9683 MHz crystal oscillator. For this

reference frequency, FIF = 1.414 MHz.

So, the 1.3751 MHz low cut-off frequency specified for a 1.5 MHz IF frequency becomes

1.3751*1.414/1.5 = 1.296 MHz

10.3 Frequency Synthesizer Description

The frequency synthesizer consists of a local oscillator (LO) driven by a fractional N phase locked loop

(PLL).

The LO is an integrated LC voltage controlled oscillator (VCO) operating at twice the RF frequency (for

the 868 MHz frequency band) or four times the RF frequency (for the 434 MHz and 315 MHz frequency

bands). This allows the I/Q signals driving the mixer to be generated by division.

Table 4. Crystal Frequency and CF Values Versus Frequency Band

RF

Frequency

(MHz)

CF1

CF0

LOF1

LOF0

FREF (Crystal

Frequency)

(MHz)

FIF (IF

Frequency)

(MHz)

Dataclk

Divider

Fdataclk

(kHz)

Digclk

Divider

Fdigclk

(kHz)

Tdigclk

(µs)

304

0

16.96745

1.414

60

282.791

30

565.582

1.77

315

0

1

0

17.58140

1.465

60

293.023

30

586.047

1.71

426

0

1

0

1

23.74913

1.484

80

296.864

40

593.728

1.68

433.92

0

1

0

1

24.19066

1.512

80

302.383

40

604.767

1.65

868.3

1

0

1

24.16139

1.510

80

302.017

40

604.035

1.66

916.5

1

25.50261

1.594

80

318.783

40

637.565

1.57

1. Refer to parameter 3.3 found in Section 19.1, “General Parameters.”

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