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PE3238EK

1500 MHz UltraCMOS™ Integer-N PLL for Low Phase Noise Applications

Peregrine Semiconductor 

Product Description

Peregrine’s PE3238 is a high performance integer-N PLL

capable of frequency synthesis up to 1.5 GHz. The

superior phase noise performance of the PE3238 is ideal

for applications such as LMDS / MMDS / WLL basestations

and demanding terrestrial systems.

The PE3238 features a 10/11 dual modulus prescaler,

counters and a phase comparator as shown in Figure 1.

Counter values are programmable through either a serial or

parallel interface and can also be directly hard wired. This

programming flexibility, combined with the dual latch

architecture enabling ping-pong loading of the main divide

counter, makes these PLLs well suited as the core for

fractional-N or sigma-delta implementation.

The PE3238 is optimized for terrestrial applications. It is

manufactured on Peregrine’s UltraCMOS™ process, a

patented variation of silicon-on-insulator (SOI) technology

on a sapphire substrate, offering the performance of GaAs

with the economy and integration of conventional CMOS.

Figure 1. Block Diagram

Product Specification

PE3238

1500 MHz UltraCMOS™ Integer-N PLL

for Low Phase Noise Applications

Features

• 1.5 GHz operation

• ÷10/11 dual modulus prescaler

• Internal phase detector

• Serial, parallel or hardwired

programmable

• Low power ¾ 20 mA at 3 V

• Q3236 PLL replacement

• Ultra-low phase noise

Fin

Prescaler

Fin

10 / 11

D(7:0)

8

Sdata

Primary

20-bit

Latch 20

Secon-

dary

20

20-bit

20

Pre_en

Latch 20

16

M(6:0)

A(3:0)

R(3:0)

fr

Main

Counter

13

66

R Counter

fp

Phase

Detector

PD_U

PD_D

fc

Document No. 70-0031-03 │ www.psemi.com

©2003-2005 Peregrine Semiconductor Corp. All rights reserved.

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