MC145220 Просмотр технического описания (PDF) - Motorola => Freescale

Номер в каталоге

Компоненты Описание

производитель

MC145220

Dual 1.1 GHz PLL Frequency Synthsizer

Motorola => Freescale 

MOTOROLA

SEMICONDUCTOR TECHNICAL DATA

Order this document

by MC145220/D

MC145220

Dual 1.1 GHz PLL Frequency

Synthesizer

BiCMOS

The MC145220 is a low–voltage, single–chip frequency synthesizer with

serial interface capable of direct usage up to 1.1 GHz. The device simulta-

neously supports two loops. The two on–chip dual–modulus prescalers may be

independently programmed to divide by either 32/33 or 64/65.

The device consists of two dual–modulus prescalers, two 6–stage A

counters, two 12–stage N counters, two fully programmable 13–stage R

(reference) counters, and two lock detectors. Four phase/frequency detectors

are included: two with current source/sink outputs and two with double–ended

outputs.

The counters are programmed via a synchronous serial port which is SPI

compatible. The serial port is byte–oriented to facilitate control via an MCU. Due

to the innovative BitGrabber Plus™ registers, the MC145220 may be cascaded

with other peripherals featuring BitGrabber Plus without requiring leading

dummy bits or multiple address bits in the serial data stream. In addition,

BitGrabber Plus peripherals may be cascaded with existing BitGrabber™

peripherals. Because this device is a dual synthesizer, a single steering bit is

used in the serial data stream to direct the data to either side of the chip.

The phase/frequency detectors have linear transfer functions (no dead

zones). The current delivered by the current source/sink outputs is controllable

via the serial port.

Also featured are low–power standby for either one or both loops and

on–board support of an external crystal. In addition, the part may be configured

such that the REFin pin accepts an external reference signal. In this

configuration, the REFout pin may be programmed to output the REFin

frequency divided by 1, 2, 4, 8, or 16.

• Operating Frequency: 40 to 1100 MHz

• Operating Supply Voltage Range: 2.7 to 5.5 V

• Supply Current: Both PLLs Operating — 12 mA Nominal

One PLL Operating, One on Standby — 6.5 mA Nominal

Both PLLs on Standby — 30 µA Maximum

• Phase Detector Output Current: Up to 2 mA @ 5 V

Up to 1 mA @ 3 V

• Operating Temperature Range: – 40 to 85°C

• Independent R Counters Allow Use of Different Step Sizes for Each Loop

• Double–Buffered R Register — Reference and Loop Divide Ratios

Updated Simultaneously

• R Counter Division Range: 1 and 10 to 8,191

• Dual–Modulus Capability Provides Total Division of the VCO Frequency up

to 262,143

• Direct Interface to Motorola SPI Data Port

• Evaluation Kit Available (Part Number MC145220EVK)

• See Application Note AN1253/D for Low–Pass Filter Design, and

AN1277/D for Offset Reference PLLs for Fine Resolution or Fast Hopping

F SUFFIX

SOG PACKAGE

20

CASE 803C

1

20

1

DT SUFFIX

TSSOP

CASE 948D

ORDERING INFORMATION

MC145220F SOG Package

MC145220DT TSSOP

PIN ASSIGNMENT

REFin 1

REFout 2

LD 3

PDout /φR 4

Rx /φV 5

GND 6

fin 7

fin 8

V+ 9

OUTPUT A 10

20 Din

19 CLK

18 LD′

17 PDout′ /φR′

16 Rx′ /φV′

15 GND′

14 fin′

13 fin′

12 V+′

11 ENB

NOTE: This product has been evaluated for operation over a wider range than 40 MHz to 1.1 GHz. If your design requires a wider

frequency range, contact your local Motorola representative for further information.

BitGrabber and BitGrabber Plus are trademarks of Motorola, Inc.

REV 4

1/98 TN98012300

©MOMoTtoOroRla,OInLc.A1998

MC145220

1

Share Link: