3236-00 Ver la hoja de datos (PDF) - Peregrine Semiconductor

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Lista de partido

3236-00

2.2 GHz Integer-N PLL for Low Phase Noise Applications

Peregrine Semiconductor 

Functional Description

The PE3236 consists of a prescaler, counters, a

phase detector and control logic. The dual modulus

prescaler divides the VCO frequency by either 10 or

11, depending on the value of the modulus select.

Counters “R” and “M” divide the reference and

prescaler output, respectively, by integer values

stored in a 20-bit register. An additional counter

Figure 3. Functional Block Diagram

fr

R Counter

(6-bit)

PE3236

Product Specification

(“A”) is used in the modulus select logic. The phase-

frequency detector generates up and down

frequency control signals. The control logic includes

a selectable chip interface. Data can be written via

serial bus, parallel bus, or hardwired direct to the

pins. There are also various operational and test

modes and lock detect.

fc

D(7:0)

Sdata

Control

Pins

Control

Logic

R(5:0)

M(8:0)

A(3:0)

Phase

Detector

Modulus

Select

Fin

10/11

M Counter

Fin

Prescaler

(9-bit)

PD_U

PD_D

LD

Cext

fp

Copyright  Peregrine Semiconductor Corp. 2003

Page 8 of 16

File No. 70/0026~02E | UTSi  CMOS RFIC SOLUTIONS

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