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MC33596 Datasheet(PDF) 8 Page - Freescale Semiconductor, Inc

Part No. MC33596
Description  PLL Tuned UHF Receiver for Data Transfer Applications
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Maker  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC33596 Datasheet(HTML) 8 Page - Freescale Semiconductor, Inc

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MC33596 Data Sheet, Rev. 4
Frequency Planning
Freescale Semiconductor
8
8.2
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 1.387 MHz1 low cut-off frequency specified for a 1.5 MHz IF frequency becomes
1.387
× 1.414/1.5 = 1.307 MHz.
8.3
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.
The fractional divider offers high flexibility in the frequency generation for:
Performing multi-channel links.
Trimming the RF carrier.
Frequencies are controlled by means of registers. To allow for user preference, two programming access
methods are offered (see Section 16.3, “Frequency Register”).
In friendly access, all frequencies are computed internally from the contents of the carrier
frequency and deviation frequency registers.
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
0
0
0
16.96745
1.414
60
282.791
30
565.582
1.77
315
0
0
1
0
17.58140
1.465
60
293.023
30
586.047
1.71
426
0
1
1
0
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
1
0
1
24.16139
1.510
80
302.017
40
604.035
1.66
916.5
1
1
1
1
25.50261
1.594
80
318.783
40
637.565
1.57
1. Refer to parameter 3.3 found in Section 19.3, “Receiver Parameters.”


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