MC145151-2 Просмотр технического описания (PDF) - Freescale Semiconductor

Номер в каталоге

Компоненты Описание

производитель

MC145151-2

PLL Frequency Synthesizers (CMOS)

Freescale Semiconductor 

MC145151-2 Parallel-Input (Interfaces with Single-Modulus Prescalers)

OSCout

OSCin

RA2

RA1

RA0

14 x 8 ROM REFERENCE DECODER

14

14-BIT ÷ R COUNTER

fin

14-BIT ÷ N COUNTER

VDD

14

T/R

TRANSMIT OFFSET ADDER

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.

Figure 2. MC145151-2 Block Diagram

1.2 Pin Descriptions

LOCK

DETECT

LD

PHASE

DETECTOR

A

PDout

PHASE

φV

DETECTOR

B

φR

fV

1.2.1 Input Pins

fin

Frequency Input (Pin 1)

Input to the ÷ N portion of the synthesizer. fin 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

RA2

RA1

RA0

0

0

0

0

0

1

0

1

0

0

1

1

1

0

0

1

0

1

1

1

0

1

1

1

Total

Divide

Value

8

128

256

512

1024

2048

2410

8192

MC145151-2 and MC145152-2 Technical Data, Rev. 5

Freescale Semiconductor

3

Share Link: