Motorola MC145220EVK Manual page 10

ARCHIVED BY FREESCALE SEMICONDUCTOR, INC. 2005
f = 10.01 kHz
Example: Synthesize 76.849 930 MHz
r(f – f) = 9.930 kHz,
N = 74,000 –
N = 73,007 + 74 +
(f – f)= 807.650 000 MHz – 730.800 070 MHz = 76.849 930 MHz
MC145220EVK
10
Freescale Semiconductor, Inc.
PLL
f = N (10.01 kHz)
r(f – f)
74,000 –
10 Hz
r(f – f)
N = 74,000 –
10 Hz
(f – f) = w(f – f) + r(f – f)
(f – f) = Desired Output Frequency
w(f – f) = Output Frequency Portion that Divides Evenly by 10 kHz
r(f – f) = Remainder from Output Frequency Division by 10 kHz
Dual Mode Formulas
9.930 kHz
= 73,007
10 Hz
76.840 MHz
= 80,765
10 kHz
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Go to: www.freescale.com
PLL
f = N (10 kHz)
w(f – f) + 740 kHz
f = 10 kHz
10 kHz
w(f – f)
N = N + 74 +
10 kHz
w(f – f) = 76.840 MHz
f = 73,007 (10.01 kHz) = 730.800 070 MHz
f = 80,765 (10 kHz) = 807.650 000 MHz
+ N
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