MC145152-2 Freescale Semiconductor, Inc, MC145152-2 Datasheet - Page 3

• Manufacturer Part Number: MC145152-2
• Description: Parallel-input Pll Frequency Synthesizer
• Manufacturer: Freescale Semiconductor, Inc

1.2
1.2.1
f
Frequency Input (Pin 1)
Input to the ÷ N portion of the synthesizer. f
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.
Freescale Semiconductor
in
OSC
NOTE: N0 - N13 inputs and inputs RA0, RA1, and RA2 have pull-up resistors that are not shown.
OSC
T/R
out
f
in
in
Pin Descriptions
Input Pins
MC145151-2 and MC145152-2 Technical Data, Rev. 5
V
RA2
RA1
RA0
DD
Figure 2. MC145151-2 Block Diagram
RA2
Reference Address Code
0
0
0
0
1
1
1
1
N13
MC145151-2 Parallel-Input (Interfaces with Single-Modulus Prescalers)
in
14 x 8 ROM REFERENCE DECODER
RA1
0
0
1
1
0
0
1
1
is typically derived from loop VCO and is ac coupled into
N11
TRANSMIT OFFSET ADDER
14-BIT
14-BIT
N9
RA0
÷
÷
0
1
0
1
0
1
0
1
N7 N6
R COUNTER
N COUNTER
14
14
N4
Divide
Value
Total
1024
2048
2410
8192
128
256
512
8
N2
N0
DETECTOR
DETECTOR
DETECT
PHASE
PHASE
LOCK
B
A
LD
PD
φ
φ
f
V
V
R
out
3