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MC145151DW2 データシート(PDF) 3 Page - Freescale Semiconductor, Inc

部品番号 MC145151DW2
部品情報  PLL Frequency Synthesizers (CMOS)
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メーカー  FREESCALE [Freescale Semiconductor, Inc]
ホームページ  http://www.freescale.com
Logo FREESCALE - Freescale Semiconductor, Inc

MC145151DW2 データシート(HTML) 3 Page - Freescale Semiconductor, Inc

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MC145151-2 Parallel-Input (Interfaces with Single-Modulus Prescalers)
MC145151-2 and MC145152-2 Technical Data, Rev. 5
Freescale Semiconductor
3
Figure 2. MC145151-2 Block Diagram
1.2
Pin Descriptions
1.2.1
Input Pins
fin
Frequency Input (Pin 1)
Input to the
÷N portion of the synthesizer. f
in is typically derived from loop VCO and is ac coupled into
the device. For larger amplitude signals (standard CMOS logic levels) dc coupling may be used.
RA0 - RA2
Reference Address Inputs (Pins 5, 6, 7)
These three inputs establish a code defining one of eight possible divide values for the total reference
divider, as defined by the table below.
Pull-up resistors ensure that inputs left open remain at a logic 1 and require only a SPST switch to alter
data to the zero state.
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
128
256
512
1024
2048
2410
8192
14 x 8 ROM REFERENCE DECODER
14-BIT
÷ N COUNTER
φ
V
φ
R
14-BIT
÷ R COUNTER
TRANSMIT OFFSET ADDER
PHASE
DETECTOR
B
PHASE
DETECTOR
A
LOCK
DETECT
LD
PDout
RA2
fin
VDD
OSCin
OSCout
T/R
14
14
fV
N13
N11
N9
N7 N6
N4
N2
N0
NOTE: N0 - N13 inputs and inputs RA0, RA1, and RA2 have pull-up resistors that are not shown.
RA0
RA1


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