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參數(shù)資料
| 型號： | M34559G6FP |
| 元件分類： | 微控制器/微處理器 |
| 英文描述： | 4-BIT, MROM, 6 MHz, MICROCONTROLLER, PQFP52 |
| 封裝： | 10 X 10 MM, 0.65 MM PITCH, PLASTIC, LQFP-52 |
| 文件頁數(shù)： | 92/93頁 |
| 文件大?。?/td> | 1810K |
| 代理商： | M34559G6FP |
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CLRC663
All information provided in this document is subject to legal disclaimers.
NXP B.V. 2011. All rights reserved.
Preliminary data sheet
COMPANY PUBLIC
Rev. 3.1 — 26 September 2011
171131
98 of 126
NXP Semiconductors
CLRC663
Contactless reader IC
16. Clock generation
16.1 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.
16.2 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_Reg and PLL_DIV_Reg). 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.
Inside the PLL the input frequency is divided by 2: fin = 13.56 MHz.
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). 23 is the
recommended value.
Fig 31. Quartz connection
Table 232: 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
CLRC663
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