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CLRC663 Datasheet(PDF) 50 Page - NXP Semiconductors

Part No. CLRC663
Description  Contactless reader IC
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Maker  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
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CLRC663 Datasheet(HTML) 50 Page - NXP Semiconductors

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CLRC663
All information provided in this document is subject to legal disclaimers.
© NXP B.V. 2012. All rights reserved.
Product data sheet
COMPANY PUBLIC
Rev. 3.3 — 3 April 2012
171133
50 of 132
NXP Semiconductors
CLRC663
Contactless reader IC
8.8 Clock generation
8.8.1 Crystal oscillator
The clock applied to the CLRC663 acts as time basis for generation of the carrier sent out
at TX and for the quadrature mixer I and Q clock generation as well as for the coder and
decoder of the synchronous system. Therefore stability of the clock frequency is an
important factor for proper performance. To obtain highest performance, clock jitter has to
be as small as possible. This is best achieved by using the internal oscillator buffer with
the recommended circuitry.
8.8.2 IntegerN PLL clock line
The CLRC663 is able to provide a clock with configurable frequency at CLKOUT from
1 MHz to 24 MHz (PLL_Ctrl and PLL_DIV). There it can serve as a clock source to a
microcontroller which avoids the need of a second crystal oscillator in the reader system.
Clock source for the IntegerN-PLL is the 27.12 MHz crystal oscillator.
Two dividers are determining the output frequency. First a feedback integer-N divider
configures the VCO frequency to be N
 fin/2 (control signal pll_set_divfb). As supported
Feedback Divider Ratios are 23, 27 and 28, VCO frequencies can be
23
 fin / 2 (312 MHz), 27  fin / 2 (366 MHz) and 28  fin / 2 (380 MHz).
The VCO frequency is divided by a factor which is defined by the output divider
(pll_set_divout). Table 41 “Divider values for selected frequencies using the integerN PLL”
shows the accuracy achieved for various frequencies (integer multiples of 1 MHz and
some typical RS232 frequencies) and the divider ratios to be used. The register bit
ClkOutEn enables the clock at CLKOUT pin.
The following formula can be used to calculate the output frequency:
Fig 32. Quartz connection
Table 40.
Crystal requirements recommendations
Symbol
Parameter
Conditions
Min
Typ
max
Unit
fxtal
crystal frequency
-
27.12
-
MHz
f
xtal/fxtal
relative crystal
frequency variation
250
-
+250
ppm
ESR
equivalent series
resistance
-50
100
CL
load capacitance
-
10
-
pF
Pxtal
crystal power
dissipation
-50
100
W
001aam308
27.12 MHz
XTAL1
XTAL2
READER IC


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