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MC145152-2 Scheda tecnica(PDF) 8 Page - Freescale Semiconductor, Inc

Il numero della parte MC145152-2
Spiegazioni elettronici  PLL Frequency Synthesizers (CMOS)
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Produttore elettronici  FREESCALE [Freescale Semiconductor, Inc]
Homepage  http://www.freescale.com
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MC145152-2 Scheda tecnica(HTML) 8 Page - Freescale Semiconductor, Inc

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MC145151-2 and MC145152-2 Technical Data, Rev. 5
8
Freescale Semiconductor
MC145152-2 Parallel-Input (Interfaces with Dual-Modulus Prescalers)
Figure 6. MC145152-2 Block Diagram
2.2
Pin Descriptions
2.2.1
Input Pins
fin
Frequency Input (Pin 1)
Input to the positive edge triggered
÷ N and ÷ A counters. f
in is typically derived from a dual-modulus
prescaler and is AC coupled into the device. For larger amplitude signals (standard CMOS logic levels)
DC coupling may be used.
RA0, RA1, RA2
Reference Address Inputs (Pins 4, 5, 6)
These three inputs establish a code defining one of eight possible divide values for the total reference
divider. The total reference divide values are as follows:
Reference Address Code
Total
Divide
Value
RA2
RA1
RA0
0
0
0
0
1
1
1
1
0
0
1
1
0
0
1
1
0
1
0
1
0
1
0
1
8
64
128
256
512
1024
1160
2048
12 x 8 ROM REFERENCE DECODER
φ
V
φ
R
12-BIT
÷ R COUNTER
PHASE
DETECTOR
LOCK
DETECT
LD
fin
OSCin
OSCout
12
N0
N2
N4 N5
N7
N9
NOTE: N0 - N9, A0 - A5, and RA0 - RA2 have pull-up resistors that are not shown.
10-BIT
÷ N COUNTER
CONTROL
LOGIC
MC
6-BIT
÷ A COUNTER
A5
A3 A2
A0
RA2
RA0
RA1


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